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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Investigation of Gravity Heat Pipe with Internal Helical Microfins in Different Sections

Gongming Xin
School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Chong Zhang
Shandong University

Wenjing Du
School of Energy and Power Engineering, Shandong University, No. 17923 Jingshi Road, Jinan 250061, Shandong, China

Baokui Yi
Shandong Special Equipment Inspection Co.,Ltd, Jinan, 250101 China

Yan Chen
School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Lin Cheng
Institute of Thermal Science and Technology, Shandong University, Jinan 250061, Shandong, China

DOI: 10.1615/IHTC15.hpp.009141
pages 3799-3805

SCHLÜSSELWÖRTER: Heat pipe, Two-phase/Multiphase flow, heat transfer coefficient, evaporation, condensation


In this paper, three different GHPs, namely Gravity Heat Pipe with internal helical microfins only in condenser section(GHPIHMc), Gravity heat pipe with internal helical microfins only in adiabatic section and condenser section (GHPIHMac), and Gravity Heat Pipe without any internal helical microfins(GHP), were manufactured and investigated experimentally, in order to figure out the different thermal characteristics of internal helical microfins on heat pipe evaporation/condensation heat transfer performances. Different input powers from 40W to 240W were performed on the evaporation section for all the three heat pipes. Two inclination angles of 45o and 90o are analyzed. Results shown that: gravity heat pipes with internal helical microfins, both GHPIHMc and GHPIHMac, presented better condensation heat transfer coefficients in both angles of 45o and 90o; in most of the tested cases, the GHPIHMac demonstrated the best evaporation heat transfer coefficients, and GHPIHMc presented the worst; the internal helical microfins in gravity heat pipes have been found being helpful more to the condensation heat transfer coefficient and less to the evaporation heat transfer coefficient, but they were proved bad if internal helical microfins only presented in the condenser section.

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