Abstract
Acombined numericaland experimentalinvestigation wasconducted to predict, measure,and optimize theheat transfer performance of a novel micro heat pipe radiator design that utilized an array of metal wires sandwiched between two thin sheets. The numerical model indicated that the maximum heat transport capacity for a single micro heat pipe increases proportionally to the square of the wire diameter, that the optimal charge volume decreased with increasing heat e ux, that the maximum heat transport capacity increases with increasesin thewire spacing, and that the overall maximum heat transport capacity of the radiator is strongly governed by the spacing of the wires, the length of the radiator, and the radiation capacity of the radiator surface. These numerical results are consistent with the experimental results, which indicated that the uniformity of the temperature distribution and the radiation efe ciency both increased with increasing wire diameter, resulting in a maximum heat transport capacity for radiators utilizing a wire diameter of 0.635 mm of 15.2 W. Additional experimental tests conducted on radiators utilizing wire diameters of 0.813 and 1.016 mm illustrated similar trends; however, for micro heat pipes with wire diameters largerthan 0.813 mm, the maximum heat transport capacity was not reached within the operating temperature of the acetone working e uid. Comparison of the proposed micro heat pipe radiators with solid conductors and uncharged versions indicated signie cant improvements in the temperature uniformity and overall radiation efe ciency. A maximum radiation efe ciency of 0.95 was observed. Nomenclature A = surface area of the radiator, m 2 Ac;l = liquid-phase cross-sectional area, m 2 Ac;v = vapor-phase cross-sectional area, m 2 Ar = surface area of the radiator, m 2 dw = wire diameter, m F = view factor g = gravitational acceleration, m/s 2 hc;o = heat transfer coefe cient outside of the condenser, J/m 2 K h fg = latent heat of vaporization, J/kg N
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