JP Journal of Heat and Mass Transfer
Volume 2, Issue 1, Pages 1 - 13
(February 2008)
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FEASIBLE STUDY ON DEVELOPMENT OF TITANIUM VARIABLE CONDUCTIVE HEAT PIPES
Masaru Ishizuka (Japan) and Shinji Nakagawa (Japan)
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Abstract: Titanium has been considered to be a useful material
for space use heat pipes because of its lighter density and thermal properties.
However, titanium has been abandoned for a long time as heat pipe material since
it has been believed to be too hard and brittle for machining and fabricating
during heat pipe production. Therefore, a feasible study of titanium variable
conductance heat pipes was carried out in order to determine whether titanium is
useful material or not. In this study, two types of titanium heat pipes were
designed, and developed. The heat pipes developed were a titanium-ammonia fixed
conductance heat pipe (FCHP) with axial grooves and a titanium-ammonia-gas
loaded variable conductance heat pipe (VCHP) with a heated reservoir. Nitrogen
was charged to VCHP as non-condensible gas. The manufacturing processes in this
heat pipe development program were studied successfully, and it has been
clarified that titanium is very desirable as heat pipe material for use in
space. |
Keywords and phrases: titanium, variable
conductive heat pipe, use in space, feasible study on development. |
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