Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model

doi:10.1007/s41365-021-00980-1

	Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model
	Hu, Chong-Ju 1,2,3; Yu, Da-Li 1; He, Mei-Sheng 1; Mei, Hua-Ping 1; Yu, Jie 1; Li, Tao-Sheng 1
刊名	NUCLEAR SCIENCE AND TECHNIQUES
	2021-12-01
卷号	32
关键词	Lithium heat pipe Bending effect Marangoni effect Capillary limit Heat Pipe-Segmented Thermoelectric Module Converters (HP-STMC)
ISSN号	1001-8042
DOI	10.1007/s41365-021-00980-1
通讯作者	Yu, Da-Li(dlyu@inest.cas.cn)
英文摘要	Lithium heat pipes have broad applications in heat pipe cooling reactors and hypersonic vehicles owing to their ultra-high working temperature. In particular, when the length of the lithium heat pipe is ultra-long, the flow and heat transfer characteristics are more complex. In this study, an improved lumped parameter model that considers the Marangoni effect, bending effect, and different vapor flow patterns and Mach numbers was developed. Thereafter, the proposed model was verified using the University of New Mexico's Heat Pipe and HTPIPE models. Finally, the verified model was applied to simulate the steady-state operation of an ultra-long lithium heat pipe in a Heat Pipe-Segmented Thermoelectric Module Converters space reactor. Based on the results: (1) Vapor thermal resistance was dominant at low heating power and decreased with increasing heating power. The vapor flow inside the heat pipe developed from the laminar to the turbulent phase, whereas the liquid phase in the heat pipe was always laminar. (2) The vapor pressure drop caused by bending was approximately 22-23% of the total, and the bending effect on the liquid pressure drop could be ignored. (3) The Marangoni effect reduced the capillary limit by hindering the liquid reflux, especially at low vapor temperatures. Without considering the Marangoni effect, the capillary limit of the lithium heat pipe was overestimated by 9% when the vapor temperature was 1400 K. (4) The total thermal resistance of the heat pipe significantly increased with increasing adiabatic length when the vapor temperature was low. Further, the wick dryness increased with increasing adiabatic length at any vapor temperature. Such findings improve on current knowledge for the optimal design and safety analysis of a heat pipe reactor, which adopts ultra-long lithium heat pipes.
资助项目	CASHIPS Director's Fund[YZJJ2021QN36] ; Key Research Program of the Chinese Academy of Sciences[ZDRW-KT-2019-1-0202]
WOS关键词	WICK
WOS研究方向	Nuclear Science & Technology ; Physics
语种	英语
出版者	SPRINGER SINGAPORE PTE LTD
WOS记录号	WOS:000730179200001
资助机构	CASHIPS Director's Fund ; Key Research Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/126428]
专题	中国科学院合肥物质科学研究院
通讯作者	Yu, Da-Li
作者单位	1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Nucl Energy Safety Technol, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Suzhou Univ, Suzhou 234000, Peoples R China
推荐引用方式 GB/T 7714	Hu, Chong-Ju,Yu, Da-Li,He, Mei-Sheng,et al. Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model[J]. NUCLEAR SCIENCE AND TECHNIQUES,2021,32.
APA	Hu, Chong-Ju,Yu, Da-Li,He, Mei-Sheng,Mei, Hua-Ping,Yu, Jie,&Li, Tao-Sheng.(2021).Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model.NUCLEAR SCIENCE AND TECHNIQUES,32.
MLA	Hu, Chong-Ju,et al."Performance evaluation of ultra-long lithium heat pipe using an improved lumped parameter model".NUCLEAR SCIENCE AND TECHNIQUES 32(2021).