Investigation of the Polymer Based V-shaped Microchannels and the Application on the Flexible Micro Heat Pipe
Date Issued
2009
Date
2009
Author(s)
Lee, Chun-Lin
Abstract
This work presents the investigations of the V-shaped microchannels and its application on the flexible micro heat pipe. The V-shaped microchannel structure is fabricated by polyurethane (PU) from pattern transfer. The lithography and orientation dependent etching is applied to silicon substrate to fabricate the mold with conjugated V-shape grooves. The whole flexible micro heat pipe is composed of PU structure, and the microchannel structure is applied to the micro heat pipe as the wick section. In addition, the aluminum plates with cubic structure are embedded in the micro heat pipe to increase the heat transfer ability at the condenser and evaporator. The design of the cubic structure could increase the contact area which enhanced the bonding with the polyurethane structure. To find the adequate working fluid, the contact angle of different fluids are measured and capillary test are applied. And the different criterions are also utilized. The methanol is chosen as the adequate working fluid. And the capillary evaporation is applied to the V-shaped microchannel structure with methanol as the testing fluid to measure the dry-out length under different tilting angles.
Subjects
flexible micro heat pipe
V-shaped microchannels
polyurethane
pattern transfer
capillary evaporation
wick structure
Type
thesis
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