Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid

Loop heat pipe (LHP) is widely used in high-power electronic cooling as a passive cooling device. In this paper, the LHP system was designed with a flat evaporator and a capillary biporous wick with cupric oxide nanofluids as working fluid in LHP. The capillary biporous wick was sintered by nickel p...

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Autores principales:	Tianyuan Zhao, Zhengyuan Ma, Zikang Zhang, Weizhong Deng, Rui Long, Wei Liu, Lei Ma, Zhichun Liu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Loop heat pipe Flat evaporator Nanofluids Heat transfer enhancement Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/62b809c9a8d342ce89f8fb67d321ebfe
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spelling	oai:doaj.org-article:62b809c9a8d342ce89f8fb67d321ebfe2021-11-24T04:32:06ZExperimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid2352-484710.1016/j.egyr.2021.10.114https://doaj.org/article/62b809c9a8d342ce89f8fb67d321ebfe2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721011343https://doaj.org/toc/2352-4847Loop heat pipe (LHP) is widely used in high-power electronic cooling as a passive cooling device. In this paper, the LHP system was designed with a flat evaporator and a capillary biporous wick with cupric oxide nanofluids as working fluid in LHP. The capillary biporous wick was sintered by nickel powder and the nanofluids were prepared by a two-step method. The startup tests, variable heat load tests, and performance degradation tests of LHP were conducted respectively and the thermal resistance was further analyzed. The results showed that, compared with distilled water, the maximum heat load increased from 290 W to 310 W and the minimum startup heat load decreased from 40 W to 20 W with nanofluids as working fluid. Both the temperature of the evaporator wall and the thermal resistance were reduced in startup tests. At the heat load of 50 W, the performance improvement was the most noticeable, where the temperature of the evaporator wall was reduced by 12.7 °C, the thermal resistance of the evaporator was reduced by 26.9%, and the thermal resistance of the LHP system was reduced by 17.6%. With a variable heat load ranging from 50 W to 290 W, the response speed of LHP became faster and the temperature fluctuation was smaller. The LHP with nanofluids as working fluid still operated normally and the change of thermal resistance with the varies of heat load had the same tendency as the previous experiment in performance degradation tests of 2 months.Tianyuan ZhaoZhengyuan MaZikang ZhangWeizhong DengRui LongWei LiuLei MaZhichun LiuElsevierarticleLoop heat pipeFlat evaporatorNanofluidsHeat transfer enhancementElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 7693-7703 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Loop heat pipe Flat evaporator Nanofluids Heat transfer enhancement Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Loop heat pipe Flat evaporator Nanofluids Heat transfer enhancement Electrical engineering. Electronics. Nuclear engineering TK1-9971 Tianyuan Zhao Zhengyuan Ma Zikang Zhang Weizhong Deng Rui Long Wei Liu Lei Ma Zhichun Liu Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
description	Loop heat pipe (LHP) is widely used in high-power electronic cooling as a passive cooling device. In this paper, the LHP system was designed with a flat evaporator and a capillary biporous wick with cupric oxide nanofluids as working fluid in LHP. The capillary biporous wick was sintered by nickel powder and the nanofluids were prepared by a two-step method. The startup tests, variable heat load tests, and performance degradation tests of LHP were conducted respectively and the thermal resistance was further analyzed. The results showed that, compared with distilled water, the maximum heat load increased from 290 W to 310 W and the minimum startup heat load decreased from 40 W to 20 W with nanofluids as working fluid. Both the temperature of the evaporator wall and the thermal resistance were reduced in startup tests. At the heat load of 50 W, the performance improvement was the most noticeable, where the temperature of the evaporator wall was reduced by 12.7 °C, the thermal resistance of the evaporator was reduced by 26.9%, and the thermal resistance of the LHP system was reduced by 17.6%. With a variable heat load ranging from 50 W to 290 W, the response speed of LHP became faster and the temperature fluctuation was smaller. The LHP with nanofluids as working fluid still operated normally and the change of thermal resistance with the varies of heat load had the same tendency as the previous experiment in performance degradation tests of 2 months.
format	article
author	Tianyuan Zhao Zhengyuan Ma Zikang Zhang Weizhong Deng Rui Long Wei Liu Lei Ma Zhichun Liu
author_facet	Tianyuan Zhao Zhengyuan Ma Zikang Zhang Weizhong Deng Rui Long Wei Liu Lei Ma Zhichun Liu
author_sort	Tianyuan Zhao
title	Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
title_short	Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
title_full	Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
title_fullStr	Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
title_full_unstemmed	Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
title_sort	experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/62b809c9a8d342ce89f8fb67d321ebfe
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Experimental investigation of a loop heat pipe with a flat evaporator and cupric oxide nanofluids as working fluid

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