An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification
In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa,...
Ausführliche Beschreibung
Autor*in: |
Kim, Seung Jun [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
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2015transfer abstract |
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Umfang: |
11 |
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Übergeordnetes Werk: |
Enthalten in: Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection - Basheer, Sabeel M. ELSEVIER, 2019, Amsterdam [u.a.] |
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Übergeordnetes Werk: |
volume:81 ; year:2015 ; pages:362-372 ; extent:11 |
Links: |
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DOI / URN: |
10.1016/j.ijheatmasstransfer.2014.10.032 |
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Katalog-ID: |
ELV013480235 |
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245 | 1 | 0 | |a An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification |
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520 | |a In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. | ||
520 | |a In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. | ||
650 | 7 | |a CHF |2 Elsevier | |
650 | 7 | |a Surface modification |2 Elsevier | |
650 | 7 | |a Surface wettability |2 Elsevier | |
650 | 7 | |a Sub-cooled flow boiling |2 Elsevier | |
700 | 1 | |a Zou, Ling |4 oth | |
700 | 1 | |a Jones, Barclay G. |4 oth | |
773 | 0 | 8 | |i Enthalten in |n Elsevier |a Basheer, Sabeel M. ELSEVIER |t Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection |d 2019 |g Amsterdam [u.a.] |w (DE-627)ELV002904500 |
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10.1016/j.ijheatmasstransfer.2014.10.032 doi GBVA2015021000020.pica (DE-627)ELV013480235 (ELSEVIER)S0017-9310(14)00917-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 600 VZ 51.79 bkl 51.45 bkl Kim, Seung Jun verfasserin aut An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification 2015transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. CHF Elsevier Surface modification Elsevier Surface wettability Elsevier Sub-cooled flow boiling Elsevier Zou, Ling oth Jones, Barclay G. oth Enthalten in Elsevier Basheer, Sabeel M. ELSEVIER Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection 2019 Amsterdam [u.a.] (DE-627)ELV002904500 volume:81 year:2015 pages:362-372 extent:11 https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.032 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 51.79 Sonstige Werkstoffe VZ 51.45 Werkstoffe mit besonderen Eigenschaften VZ AR 81 2015 362-372 11 045F 620 |
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10.1016/j.ijheatmasstransfer.2014.10.032 doi GBVA2015021000020.pica (DE-627)ELV013480235 (ELSEVIER)S0017-9310(14)00917-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 600 VZ 51.79 bkl 51.45 bkl Kim, Seung Jun verfasserin aut An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification 2015transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. CHF Elsevier Surface modification Elsevier Surface wettability Elsevier Sub-cooled flow boiling Elsevier Zou, Ling oth Jones, Barclay G. oth Enthalten in Elsevier Basheer, Sabeel M. ELSEVIER Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection 2019 Amsterdam [u.a.] (DE-627)ELV002904500 volume:81 year:2015 pages:362-372 extent:11 https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.032 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 51.79 Sonstige Werkstoffe VZ 51.45 Werkstoffe mit besonderen Eigenschaften VZ AR 81 2015 362-372 11 045F 620 |
allfields_unstemmed |
10.1016/j.ijheatmasstransfer.2014.10.032 doi GBVA2015021000020.pica (DE-627)ELV013480235 (ELSEVIER)S0017-9310(14)00917-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 600 VZ 51.79 bkl 51.45 bkl Kim, Seung Jun verfasserin aut An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification 2015transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. CHF Elsevier Surface modification Elsevier Surface wettability Elsevier Sub-cooled flow boiling Elsevier Zou, Ling oth Jones, Barclay G. oth Enthalten in Elsevier Basheer, Sabeel M. ELSEVIER Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection 2019 Amsterdam [u.a.] (DE-627)ELV002904500 volume:81 year:2015 pages:362-372 extent:11 https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.032 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 51.79 Sonstige Werkstoffe VZ 51.45 Werkstoffe mit besonderen Eigenschaften VZ AR 81 2015 362-372 11 045F 620 |
allfieldsGer |
10.1016/j.ijheatmasstransfer.2014.10.032 doi GBVA2015021000020.pica (DE-627)ELV013480235 (ELSEVIER)S0017-9310(14)00917-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 600 VZ 51.79 bkl 51.45 bkl Kim, Seung Jun verfasserin aut An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification 2015transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. CHF Elsevier Surface modification Elsevier Surface wettability Elsevier Sub-cooled flow boiling Elsevier Zou, Ling oth Jones, Barclay G. oth Enthalten in Elsevier Basheer, Sabeel M. ELSEVIER Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection 2019 Amsterdam [u.a.] (DE-627)ELV002904500 volume:81 year:2015 pages:362-372 extent:11 https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.032 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 51.79 Sonstige Werkstoffe VZ 51.45 Werkstoffe mit besonderen Eigenschaften VZ AR 81 2015 362-372 11 045F 620 |
allfieldsSound |
10.1016/j.ijheatmasstransfer.2014.10.032 doi GBVA2015021000020.pica (DE-627)ELV013480235 (ELSEVIER)S0017-9310(14)00917-X DE-627 ger DE-627 rakwb eng 620 620 DE-600 600 VZ 51.79 bkl 51.45 bkl Kim, Seung Jun verfasserin aut An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification 2015transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. CHF Elsevier Surface modification Elsevier Surface wettability Elsevier Sub-cooled flow boiling Elsevier Zou, Ling oth Jones, Barclay G. oth Enthalten in Elsevier Basheer, Sabeel M. ELSEVIER Analytical and computational investigation on host-guest interaction of cyclohexyl based thiosemicarbazones: Construction of molecular logic gates using multi-ion detection 2019 Amsterdam [u.a.] (DE-627)ELV002904500 volume:81 year:2015 pages:362-372 extent:11 https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.032 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 51.79 Sonstige Werkstoffe VZ 51.45 Werkstoffe mit besonderen Eigenschaften VZ AR 81 2015 362-372 11 045F 620 |
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an experimental study on sub-cooled flow boiling chf of r134a at low pressure condition with atmospheric pressure (ap) plasma assisted surface modification |
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An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification |
abstract |
In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. |
abstractGer |
In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. |
abstract_unstemmed |
In this study, sub-cooled flow boiling critical heat flux tests at low pressure were conducted in a rectangular flow channel with one uniformly heated surface, using simulant fluid R-134a as coolant. The experiments were conducted under the following conditions: (1) inlet pressure (P) of 400–800kPa, (2) mass flux (G) of 124–248kg/m2 s, (3) inlet sub-cooling enthalpy (ΔHi ) of 12–26kJ/kg. Parametric trends of macroscopic system parameters (G, P,ΔHi ) were examined by changing inlet conditions. Those trends were found to be generally consistent with previous understandings of CHF behavior at low pressure condition (i.e. reduced pressure less than 0.2). A fluid-to-fluid scaling model was utilized to convert the test data obtained with the simulant fluid (R-134a) into the prototypical fluid (water). The comparison between the converted CHF of equivalent water and CHF look-up table with same operation conditions were conducted, which showed good agreement. Furthermore, the effect of surface wettability on CHF was also investigated by applying atmospheric pressure plasma (AP-plasma) treatment to modify the surface characteristic. With AP-plasma treatment, the change of microscopic surface characteristic was measured in terms of static contact angle. The static contact angle was reduced from 80° on original non-treated surface to 15° on treated surface. An enhancement of 18% on CHF values under flow boiling conditions were observed on AP-plasma treated surfaces compared to those on non-treated heating surfaces. |
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An experimental study on sub-cooled flow boiling CHF of R134a at low pressure condition with atmospheric pressure (AP) plasma assisted surface modification |
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