平板铝热管微沟槽吸液芯的制备及毛细性能研究

Fabrication and Capillary Performance of Micro-grooved Wicks for Aluminium Flat-plate Heat Pipes

采用犁切-挤压(P-E)和表面化学加工相结合的方法制备出一种新型的铝沟槽吸液芯结构,通过毛细上升红外测试方法对其毛细性能进行测试表征,研究不同的CuCl_2溶液浓度和浸泡时间对吸液芯结构毛细性能的影响。研究结果表明,化学加工后的铝沟槽吸液芯的毛细性能显著提高,其最大毛细上升高度可达49.3 mm,相比于未经化学加工的犁切沟槽,其毛细上升高度提高约79.3%;当CuCl_2溶液浓度超过1mol/L时,浸泡时间和溶液浓度对铝沟槽吸液芯的毛细压力影响较小。该方法能够简单、有效的提高铝沟槽吸液芯的毛细性能,为平板铝热管吸液芯的制备提供了一种新手段。

A novel micro V-grooves wick,fabricated by ploughing-extrusion(P-E)method and then surface treated by chemical machining,is developed for enhancing the performance of aluminium flat-plate heat pipes(AFHPs).Capillary rise tests with acetone are performed to characterize the capillary force of the wick structures.An infrared(IR)thermal imaging method is utilized to monitor the capillary rise processes.The effects of solution concentration and immersion time on the capillary force are investigated.Experimental results indicate that the capillary rise height of the etched aluminium grooved wicks is substantially higher than that of non-etched wick.The maximum capillary rise height of etched aluminium grooved wicks is 49.3 mm—an increase of approximately 79.3%compared to the one with no chemical machining.Additionally,the concentration and immersion time have a minimal effect on the capillary performance of grooved aluminium wicks when the concentration of CuCl2 solution was more than 1 mol/L.All the results demonstrate that the combination of P-E process and chemical machining technology is a convenient and effective means to enhance the capillary performance of grooved aluminium wicks and the heat transport capability of AFHPs.