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首页> 外文期刊>International Journal of Heat and Mass Transfer >The length and bending angle effects on the cooling performance of flat plate heat pipes
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The length and bending angle effects on the cooling performance of flat plate heat pipes

机译：长度和弯曲角度对平板热管冷却性能的影响

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摘要

The effects of length and bending angle on the cooling performance of flat plate heat pipes (FPHPs) were examined experimentally in this study. The length effect was explored with four lengths of 80,150, 200, and 300 mm; each FPHP was filled by acetone in cold condition to its optimum filling ratio. The bending angle effect was examined with four angles of 0°, 30°, 60°, and 90°, using the length of 200 mm and the volumetric filling ratio of 31.4%. All FPHPs had the same cross sectional area of 50 mm (width) by 2.5 mm (thickness). Experimental results showed that by increasing the length from 80 to 150 mm, to 200 mm, and to 300 mm, the minimum thermal resistance, R_(th(min)), increased by the factors of 2.4, 6.0, and 17.9, respectively from that of 0.103 K/W of the 80 mm FPHP. A rapid increase in R_(th(min)) occurred around the length of 150 mm. For the FPHPs with lengths smaller than 150 mm, R_(th(min)) could be smaller than 0.252 K/W. The maximum heat transport capability Q_(max) decreased quickly from 109.5 to 49.6 W (a factor of about 0.452) when the length was increased from 80 to 150 mm, and then slowly decreased to the minimum value of 35 W (a factor of about 0.318) for the length of 300 mm. In contrast, the results of bending angles showed that by increasing the bending angle, the thermal resistance decreased; R_(th(min)) reduced by a factor of about 3.3 from 0.6207 K/W of 0° bending to 0.1885 K/W of 90° bending. The corresponding maximum effective thermal conductivity, K_(eff(max)), increased from 1933.4 to 6365.6 W/mK and Q_(max) increased from 45 to 85 W. That is, a short FPHP preformed better than those of longer ones, and the thermal performance of FPHPs could be enhanced by proper bending.
机译：通过实验研究了长度和弯曲角度对平板热管（FPHP）冷却性能的影响。探索了长度效应，其中四种长度分别为80,150、200和300 mm。每个FPHP在低温条件下用丙酮填充至最佳填充比。使用200 mm的长度和31.4％的体积填充率，以0°，30°，60°和90°四个角度检查了弯曲角度的影响。所有FPHP的横截面积相同，均为50毫米（宽度）乘以2.5毫米（厚度）。实验结果表明，通过将长度从80毫米增加到150毫米，将200毫米增加到300毫米，最小热阻R_（th（min））分别从2.4倍，6.0倍和17.9倍增加。 80 mm FPHP的0.103 K / W R_（th（min））的快速增加发生在150 mm的长度附近。对于长度小于150 mm的FPHP，R_（th（min））可能小于0.252 K / W。当长度从80 mm增加到150 mm时，最大传热能力Q_（max）从109.5迅速减小到49.6 W（大约0.452），然后缓慢减小到最小值35 W（大约25倍）。 0.318）的长度为300毫米。相反，弯曲角度的结果表明，通过增加弯曲角度，热阻降低；而通过增加弯曲角度，热阻降低。 R_（th（min））从0°弯曲的0.6207 K / W降低到90°弯曲的0.1885 K / W降低了约3.3倍。相应的最大有效导热系数K_（eff（max））从1933.4增加到6365.6 W / mK，Q_（max）从45 W增加到85W。也就是说，短的FPHP比长的FPHP性能更好，并且通过适当的弯曲可以提高FPHP的热性能。

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