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对直径为6 mm,长为210 mm的小型微槽道柱状热管通过机加工方法制成的扁平热管(扁平厚度δ分别为3.5、3、2.5和2 mm)的轴向温度分布、极限传输功率、热阻以及蒸发换热系数等传热特性进行了研究。试验所用的热管为轴向梯形微槽道热管。对实验数据的分析表明,极限传输功率随着压扁度的增加而逐渐减小。将直径为6mm的柱状热管压扁成2 mm扁平热管后,极限传输功率降至原来的1/4。将直径为6 mm的柱状热管分别压扁至3.5、3及2.5 mm时,热阻基本稳定在0.08℃/W左右,但压扁至2 mm时,热阻明显增大。直径为6 mm的柱状热管压扁成3.5 mm扁平热管时,蒸发换热系数增大,但从3.5 mm压扁至2 mm后,蒸发换热系数急剧下降。
The axial temperature distribution of flat heat pipes (flat thickness δ = 3.5, 3, 2.5 and 2 mm, respectively) made by machining a small micro-channel cylindrical heat pipe with a diameter of 6 mm and a length of 210 mm, the ultimate transmission power , Thermal resistance and heat transfer coefficient of heat transfer characteristics were studied. The test heat pipe used for the axial trapezoidal micro-channel heat pipe. Analysis of the experimental data shows that the ultimate transmission power decreases with the increase of the flattening. The diameter of 6mm column heat pipe flattened into 2 mm flat heat pipe, the ultimate transmission power down to the original 1/4. The thermal resistance of the 6mm diameter cylindrical heat pipe crushed to 3.5, 3 and 2.5mm respectively was basically stable at about 0.08 ℃ / W, but the thermal resistance obviously increased when it was crushed to 2mm. When the diameter of 6 mm flattened into 3.5 mm flat heat pipe, the evaporation heat transfer coefficient increases, but after 3.5 mm flattening to 2 mm, the evaporation heat transfer coefficient drops sharply.