燕尾型轴向槽道热管薄液膜热传递及实验验证

Theoretical Investigation and Experimental Validation on Thin Film Heat Transfer of Heat Pipe With Axially Swallow-tailed Microgrooves

基于薄液膜的传热传质理论建立了燕尾形槽道热管的蒸发段与冷凝段热传递的数学模型,利用Laplace-Young方程得到不同负荷下的轴向毛细半径分布.分析求解了蒸发段温降与冷凝段的温降随热负荷的变化,进而得出了热管温降随热负荷的变化.实验研究了热管在不同冷源温度下温降随热负荷的变化.结果表明:槽道中液膜厚度沿轴向逐渐增厚;蒸发段和冷凝段温降随热负荷增大而增大;通过比较模型预测值和实验测量值,发现两者吻合较好,进一步验证本文所建的模型的正确性.

A thermal model for evaporator and condenser section of heat pipe with axially swallow-tailed microgrooves was developed based on heat and mass transfer of thin liquid film. The capillary radius under different heat load conditions was obtained from the Laplace-Young equation. The effect of heat load on the temperature drop of evaporator and condenser section was discussed and the total temperature drop of heat pipe was obtained. An experimental research on the heat pipe was presented and the effect of heat load on the temperature drop was analyzed in different temperature of cold sources. The results showed that the thickness of liquid film in the microgroove increased along the axial direction; the temperature drop of evaporator and condenser section increased with a rise of heat load. The analytical results were compared with experimental results and found to be in good agreement, and the accuracy of the model was further verified by the experiment.