小型微槽道热管90°弯曲前后传热性能比较

Comparison of the Heat Transfer Performance in an AGHP with and Without 90° Bend

针对直径为6mm,长为210mm小型槽道柱状热管通过压扁和弯曲制成的厚度分别为3mm和2mm,绝热段90°弯曲的扁平弯曲热管进行试验研究。对热管的轴向温度分布、极限传输功率、热阻以及蒸发段和冷凝段换热系数等进行了测试和分析。研究结果表明:2mm厚热管在弯曲前后的传热性能基本保持不变。对于圆柱状热管和3mm厚扁平热管,直管在极限状态时,只有靠近蒸发段端点的温度骤然上升;弯管在极限状态下的蒸发段温度呈梯次增加。弯管的极限传输功率小于直管,热阻与直管相近。直管的蒸发段换热系数随着功率的增加稍有增加,在出现传热极限时急剧下降;弯管的蒸发段换热系数随着功率的增加一直下降。无论是直管还是弯管,冷凝段换热系数均随功率的增加稍有下降。

Round,straight mini axial grooved heat pipes(AGHP) with a diameter of 6mm and a length of 210mm were crooked into 90° bend and pressed into flattened,bend heat pipes with a thickness of 3mm and 2mm respectively.The article measured the axial temperature distribution,heat transfer limit,thermal resistance and the heat transfer coefficient in the evaporator and the condenser of the said AGHPs and analyzed and studied the results.The results indicated: the heat transfer performance of 2mm-thickness AGHPs are s...