Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

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

Get access (open in a dialog) DOI: 10.1615/IHTC15.hpp.009141
pages 3799-3805

Abstrakt

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.