Analyzing and modeling on optimized L-ratio of evaporator section to condenser section for micro heat pipe heat sinks

This paper is focused on modeling and analysis on the determination of the optimized L-ratio, or L/sub e//L/sub c/, for the length of evaporator section to the length of condenser section of cylindrical heat pipes, for a heat sink in the horizontal position. The independent variables (for an equippe...

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Bibliographic Details
Main Authors: Xiao Ping Wu, Mochizuki, M., Saito, Y., Nguyen, T., Wuttijumnong, V., Wu, D.
Format: Conference Proceeding
Language:English
Subjects:
Australia
Bonding
Conducting materials
Fixtures
Heat sinks
Heat transfer
Resistance heating
Thermal conductivity
Thermal force
Thermal resistance
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Summary:This paper is focused on modeling and analysis on the determination of the optimized L-ratio, or L/sub e//L/sub c/, for the length of evaporator section to the length of condenser section of cylindrical heat pipes, for a heat sink in the horizontal position. The independent variables (for an equipped heat pipe on which all fixtures are firmed) in the function of the total thermal resistance are L/sub e/ and L/sub c/. Given the fact that this function has a local minimum between two fixed end points, the minimum extremal of the thermal resistance function can be obtained by taking the derivative of this functions and setting it to zero. Since the total length of a heat pipe, L, is constant, therefore L/sub c/ may be replaced by L-L/sub e/, then the differential equation can be solved. In this paper, a formula to analyze the optimal L/sub e//L/sub c/ ratio is established. Table 2 to table 4 show analyzed results for diameters from 4 mm to 6 mm micro heat pipes in assemblies which are currently quite popular in applications.
ISSN:1065-2221
2577-1000
DOI:10.1109/STHERM.2003.1194360