Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins

Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flo...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Bai, Wandong [verfasserIn] Chen, Wei [verfasserIn] Zeng, Chang [verfasserIn] Wu, Ge [verfasserIn] Chai, Xiaoming [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins

Übergeordnetes Werk:	Enthalten in: International journal of thermal sciences - Amsterdam [u.a.] : Elsevier Science, 1996, 179
Übergeordnetes Werk:	volume:179

DOI / URN:	10.1016/j.ijthermalsci.2022.107658

Katalog-ID:	ELV058049622

Internformat


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245	1	0	\|a Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
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520			\|a Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers.
650		4	\|a Heat pipe heat exchanger
650		4	\|a Annular heat exchanger
650		4	\|a Eccentric annulus
650		4	\|a Heat transfer
650		4	\|a Longitudinal fins
700	1		\|a Chen, Wei \|e verfasserin \|4 aut
700	1		\|a Zeng, Chang \|e verfasserin \|4 aut
700	1		\|a Wu, Ge \|e verfasserin \|4 aut
700	1		\|a Chai, Xiaoming \|e verfasserin \|4 aut
773	0	8	\|i Enthalten in \|t International journal of thermal sciences \|d Amsterdam [u.a.] : Elsevier Science, 1996 \|g 179 \|h Online-Ressource \|w (DE-627)320509982 \|w (DE-600)2013298-0 \|w (DE-576)259271438 \|x 1778-4166 \|7 nnns
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matchkey_str	article:17784166:2022----::etrnfrnecnrcfetnetgtoohappueanlretxhnes
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publishDate	2022
allfields	10.1016/j.ijthermalsci.2022.107658 doi (DE-627)ELV058049622 (ELSEVIER)S1290-0729(22)00195-8 DE-627 ger DE-627 rda eng 530 620 VZ 50.38 bkl Bai, Wandong verfasserin aut Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers. Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins Chen, Wei verfasserin aut Zeng, Chang verfasserin aut Wu, Ge verfasserin aut Chai, Xiaoming verfasserin aut Enthalten in International journal of thermal sciences Amsterdam [u.a.] : Elsevier Science, 1996 179 Online-Ressource (DE-627)320509982 (DE-600)2013298-0 (DE-576)259271438 1778-4166 nnns volume:179 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.38 Technische Thermodynamik VZ AR 179
spelling	10.1016/j.ijthermalsci.2022.107658 doi (DE-627)ELV058049622 (ELSEVIER)S1290-0729(22)00195-8 DE-627 ger DE-627 rda eng 530 620 VZ 50.38 bkl Bai, Wandong verfasserin aut Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers. Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins Chen, Wei verfasserin aut Zeng, Chang verfasserin aut Wu, Ge verfasserin aut Chai, Xiaoming verfasserin aut Enthalten in International journal of thermal sciences Amsterdam [u.a.] : Elsevier Science, 1996 179 Online-Ressource (DE-627)320509982 (DE-600)2013298-0 (DE-576)259271438 1778-4166 nnns volume:179 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.38 Technische Thermodynamik VZ AR 179
allfields_unstemmed	10.1016/j.ijthermalsci.2022.107658 doi (DE-627)ELV058049622 (ELSEVIER)S1290-0729(22)00195-8 DE-627 ger DE-627 rda eng 530 620 VZ 50.38 bkl Bai, Wandong verfasserin aut Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers. Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins Chen, Wei verfasserin aut Zeng, Chang verfasserin aut Wu, Ge verfasserin aut Chai, Xiaoming verfasserin aut Enthalten in International journal of thermal sciences Amsterdam [u.a.] : Elsevier Science, 1996 179 Online-Ressource (DE-627)320509982 (DE-600)2013298-0 (DE-576)259271438 1778-4166 nnns volume:179 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.38 Technische Thermodynamik VZ AR 179
allfieldsGer	10.1016/j.ijthermalsci.2022.107658 doi (DE-627)ELV058049622 (ELSEVIER)S1290-0729(22)00195-8 DE-627 ger DE-627 rda eng 530 620 VZ 50.38 bkl Bai, Wandong verfasserin aut Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers. Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins Chen, Wei verfasserin aut Zeng, Chang verfasserin aut Wu, Ge verfasserin aut Chai, Xiaoming verfasserin aut Enthalten in International journal of thermal sciences Amsterdam [u.a.] : Elsevier Science, 1996 179 Online-Ressource (DE-627)320509982 (DE-600)2013298-0 (DE-576)259271438 1778-4166 nnns volume:179 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.38 Technische Thermodynamik VZ AR 179
allfieldsSound	10.1016/j.ijthermalsci.2022.107658 doi (DE-627)ELV058049622 (ELSEVIER)S1290-0729(22)00195-8 DE-627 ger DE-627 rda eng 530 620 VZ 50.38 bkl Bai, Wandong verfasserin aut Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers. Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins Chen, Wei verfasserin aut Zeng, Chang verfasserin aut Wu, Ge verfasserin aut Chai, Xiaoming verfasserin aut Enthalten in International journal of thermal sciences Amsterdam [u.a.] : Elsevier Science, 1996 179 Online-Ressource (DE-627)320509982 (DE-600)2013298-0 (DE-576)259271438 1778-4166 nnns volume:179 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 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_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.38 Technische Thermodynamik VZ AR 179
language	English
source	Enthalten in International journal of thermal sciences 179 volume:179
sourceStr	Enthalten in International journal of thermal sciences 179 volume:179
format_phy_str_mv	Article
bklname	Technische Thermodynamik
institution	findex.gbv.de
topic_facet	Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins
dewey-raw	530
isfreeaccess_bool	false
container_title	International journal of thermal sciences
authorswithroles_txt_mv	Bai, Wandong @@aut@@ Chen, Wei @@aut@@ Zeng, Chang @@aut@@ Wu, Ge @@aut@@ Chai, Xiaoming @@aut@@
publishDateDaySort_date	2022-01-01T00:00:00Z
hierarchy_top_id	320509982
dewey-sort	3530
id	ELV058049622
language_de	englisch
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author	Bai, Wandong
spellingShingle	Bai, Wandong ddc 530 bkl 50.38 misc Heat pipe heat exchanger misc Annular heat exchanger misc Eccentric annulus misc Heat transfer misc Longitudinal fins Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
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topic_title	530 620 VZ 50.38 bkl Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins Heat pipe heat exchanger Annular heat exchanger Eccentric annulus Heat transfer Longitudinal fins
topic	ddc 530 bkl 50.38 misc Heat pipe heat exchanger misc Annular heat exchanger misc Eccentric annulus misc Heat transfer misc Longitudinal fins
topic_unstemmed	ddc 530 bkl 50.38 misc Heat pipe heat exchanger misc Annular heat exchanger misc Eccentric annulus misc Heat transfer misc Longitudinal fins
topic_browse	ddc 530 bkl 50.38 misc Heat pipe heat exchanger misc Annular heat exchanger misc Eccentric annulus misc Heat transfer misc Longitudinal fins
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title	Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
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title_full	Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
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author_browse	Bai, Wandong Chen, Wei Zeng, Chang Wu, Ge Chai, Xiaoming
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title_sort	heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
title_auth	Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
abstract	Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers.
abstractGer	Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers.
abstract_unstemmed	Within the annular heat pipe heat exchangers, heat transfer capacity and assembly eccentricity are two crucial issues for the overall thermal performance (such as heat transfer capacity, flow friction, and temperature distribution). This study aimed to investigate: 1) the heat transfer and fluid flow characteristics of two annular heat exchangers for the purpose of configuration optimization; and 2) the influence of an assembly clearance and the resulting eccentricity on heat transfer characteristic and temperature distribution. Two types of densely longitudinal fins with different heights were designed to enhance heat transfer. Three eccentricities were compared under uniform heat flux and uniform temperature conditions, and two mediums of air and helium were considered to fill the assembly clearance. The results indicated that due to the larger heat transfer area, the average heat transfer coefficient and friction factor produced by the high fins equipped annular heat exchanger were about 20% and 28% higher than the ones with short fins within Re = 2000–15000. The thermal resistance of the clearance varied with the assembly eccentricity. The larger the eccentricity, the smaller the average thermal resistance. Significant temperature gradients appeared in assembly clearance under uniform heat flux conditions. Under uniform temperature conditions, the temperature gradients are outstanding in the annular heat exchanger. A filling medium with greater thermal conductivity is suggested since it can effectively improve the circumferential temperature nonuniformity. This study provides a design guideline as well as heat transfer performance optimization for the heat pipe heat exchangers.
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title_short	Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins
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author2	Chen, Wei Zeng, Chang Wu, Ge Chai, Xiaoming
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doi_str	10.1016/j.ijthermalsci.2022.107658
up_date	2024-07-06T17:55:02.750Z
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Heat transfer and eccentric effect investigation on heat pipe used annular heat exchangers with densely longitudinal fins

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