| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 88 === The performance of sintered miniature heat pipe with different
wick structure parameters is investigated in this study.
First of all, the influence of wick structure parameters is
determined by using theory of capillary limitation. As a result,
the degree of importance is found to be as follows: (1)porosity,
(2)powder diameter, (3)thickness of wick structure.
Next, the performance tests are carried out with different wick
structure parameters. The experimental results show:
(1)porosity:
The maximum heat transport capacity(Q$_{max}$) of heat pipe
increases with increasing porosity.
(2)powder diameter:
The Q$_{max}$ of sintered heat pipe with larger powder is
higher than that with smaller diameter.
In addition, the Q$_{max}$ with wide powder distribution is
less than that with narrow powder distribution.
(3)thickness of wick structure:
The Q$_{max}$ increases with increasing thickness of wick
structure, while the thermal resistance increases also with
increasing thickness.
In the theoretical analysis, both the ''''radius of curvature
($r_c$) and permeability (K)'''''''' are found to be of great
importance. By adopting the formulae developed for both
sintered spherical powder and fiber and adjusting their
proportion, the agreement between experimental and theoretical
result is found to be quite good in the operation temperature
range tested here.
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