Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators
Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional t...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Park, Jongmyung [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Schlagwörter: |
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| Anmerkung: |
© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of mechanical science and technology - Berlin : Springer, 2005, 29(2015), 11 vom: Nov., Seite 4981-4991 |
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| Übergeordnetes Werk: |
volume:29 ; year:2015 ; number:11 ; month:11 ; pages:4981-4991 |
| Links: |
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| DOI / URN: |
10.1007/s12206-015-1046-5 |
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| Katalog-ID: |
SPR025316206 |
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| 100 | 1 | |a Park, Jongmyung |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
| 264 | 1 | |c 2015 | |
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| 520 | |a Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. | ||
| 650 | 4 | |a Angled rib turbulator |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Heat transfer augmentation |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Turbulent air flow |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Vortex flow |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Park, Samgyu |4 aut | |
| 700 | 1 | |a Ligrani, P. M. |4 aut | |
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10.1007/s12206-015-1046-5 doi (DE-627)SPR025316206 (SPR)s12206-015-1046-5-e DE-627 ger DE-627 rakwb eng Park, Jongmyung verfasserin aut Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 Park, Samgyu aut Ligrani, P. M. aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 29(2015), 11 vom: Nov., Seite 4981-4991 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:29 year:2015 number:11 month:11 pages:4981-4991 https://dx.doi.org/10.1007/s12206-015-1046-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 29 2015 11 11 4981-4991 |
| spelling |
10.1007/s12206-015-1046-5 doi (DE-627)SPR025316206 (SPR)s12206-015-1046-5-e DE-627 ger DE-627 rakwb eng Park, Jongmyung verfasserin aut Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 Park, Samgyu aut Ligrani, P. M. aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 29(2015), 11 vom: Nov., Seite 4981-4991 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:29 year:2015 number:11 month:11 pages:4981-4991 https://dx.doi.org/10.1007/s12206-015-1046-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 29 2015 11 11 4981-4991 |
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10.1007/s12206-015-1046-5 doi (DE-627)SPR025316206 (SPR)s12206-015-1046-5-e DE-627 ger DE-627 rakwb eng Park, Jongmyung verfasserin aut Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 Park, Samgyu aut Ligrani, P. M. aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 29(2015), 11 vom: Nov., Seite 4981-4991 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:29 year:2015 number:11 month:11 pages:4981-4991 https://dx.doi.org/10.1007/s12206-015-1046-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 29 2015 11 11 4981-4991 |
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10.1007/s12206-015-1046-5 doi (DE-627)SPR025316206 (SPR)s12206-015-1046-5-e DE-627 ger DE-627 rakwb eng Park, Jongmyung verfasserin aut Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 Park, Samgyu aut Ligrani, P. M. aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 29(2015), 11 vom: Nov., Seite 4981-4991 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:29 year:2015 number:11 month:11 pages:4981-4991 https://dx.doi.org/10.1007/s12206-015-1046-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 29 2015 11 11 4981-4991 |
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10.1007/s12206-015-1046-5 doi (DE-627)SPR025316206 (SPR)s12206-015-1046-5-e DE-627 ger DE-627 rakwb eng Park, Jongmyung verfasserin aut Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 Park, Samgyu aut Ligrani, P. M. aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 29(2015), 11 vom: Nov., Seite 4981-4991 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:29 year:2015 number:11 month:11 pages:4981-4991 https://dx.doi.org/10.1007/s12206-015-1046-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 29 2015 11 11 4981-4991 |
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Enthalten in Journal of mechanical science and technology 29(2015), 11 vom: Nov., Seite 4981-4991 volume:29 year:2015 number:11 month:11 pages:4981-4991 |
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Enthalten in Journal of mechanical science and technology 29(2015), 11 vom: Nov., Seite 4981-4991 volume:29 year:2015 number:11 month:11 pages:4981-4991 |
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Park, Jongmyung @@aut@@ Park, Samgyu @@aut@@ Ligrani, P. M. @@aut@@ |
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Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Angled rib turbulator</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Heat transfer augmentation</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Turbulent air flow</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Vortex flow</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Park, Samgyu</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ligrani, P. 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| author |
Park, Jongmyung |
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Park, Jongmyung misc Angled rib turbulator misc Heat transfer augmentation misc Turbulent air flow misc Vortex flow Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
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Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators Angled rib turbulator (dpeaa)DE-He213 Heat transfer augmentation (dpeaa)DE-He213 Turbulent air flow (dpeaa)DE-He213 Vortex flow (dpeaa)DE-He213 |
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Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
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numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
| title_auth |
Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
| abstract |
Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 |
| abstractGer |
Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 |
| abstract_unstemmed |
Abstract Turbulent air flows within a channel with angled rib turbulators (45 degrees) on one wall are numerically predicted using the numerical code ANSYS CFX with a Shear-stress transport (SST) κ-ω turbulence model, and a hexahedral grid with 7115346 cells and no wall function. Three-dimensional turbulent transport, and detailed flow structural characteristics are considered to provide new insight into the mechanisms which result in surface heat transfer augmentations. Time-averaged turbulent flow characteristics and surface Nusselt number distributions are presented for an inlet turbulence intensity level of 1.0 percent, and for Reynolds numbers based upon channel height of 18300 and 48000. Overall, the numerically-predicted results show that large-scale, secondary flow induces a collection of small-scale vortical flows in the channel, as a result of local interactions with individual rib turbulators. These are often associated with different sized and highly skewed vortex pairs, which also induce secondary advection and increased turbulent mixing near ribbed channel surfaces. Within the flow separation regions, just downstream of each rib, surface Nusselt number ratios which are locally lower than for other surface locations, and local secondary flows are generally and partially characterized as upwash flows, with large positive magnitudes of spanwise vorticity, large static pressure deficits, and large static pressure augmentation regions. As the shear layers (initially located above the recirculation zones) impinge onto the test surface, increased mixing develops, as well as local thinning of the reattaching boundary layers, which lead to local Nusselt numbers which are generally higher than for other locations along the test surface. © The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2015 |
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11 |
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Numerical predictions of detailed flow structural characteristics in a channel with angled rib turbulators |
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https://dx.doi.org/10.1007/s12206-015-1046-5 |
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Park, Samgyu Ligrani, P. M. |
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Park, Samgyu Ligrani, P. M. |
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| doi_str |
10.1007/s12206-015-1046-5 |
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2024-07-03T15:14:17.578Z |
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| score |
7.3999043 |