具有混合润湿性图案的圆柱表面池沸腾传热强化
Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns.
作者信息
Kumar C S Sujith, Chang Yao Wen, Chen Ping-Hei
机构信息
Department of Mechanical Engineering, National Taiwan University.
Department of Mechanical Engineering, National Taiwan University;
出版信息
J Vis Exp. 2017 Apr 10(122):55387. doi: 10.3791/55387.
In this study, pool-boiling heat-transfer experiments were performed to investigate the effect of the number of interlines and the orientation of the hybrid wettable pattern. Hybrid wettable patterns were produced by coating superhydrophilic SiO2 on a masked, hydrophobic, cylindrical copper surface. Using de-ionized (DI) water as the working fluid, pool-boiling heat-transfer studies were conducted on the different surface-treated copper cylinders of a 25-mm diameter and a 40-mm length. The experimental results showed that the number of interlines and the orientation of the hybrid wettable pattern influenced the wall superheat and the HTC. By increasing the number of interlines, the HTC was enhanced when compared to the plain surface. Images obtained from the charge-coupled device (CCD) camera indicated that more bubbles formed on the interlines as compared to other parts. The hybrid wettable pattern with the lowermost section being hydrophobic gave the best heat-transfer coefficient (HTC). The experimental results indicated that the bubble dynamics of the surface is an important factor that determines the nucleate boiling.
在本研究中，进行了池沸腾传热实验，以研究线间数量和混合润湿性图案的取向的影响。通过在掩蔽的疏水圆柱形铜表面上涂覆超亲水二氧化硅来制备混合润湿性图案。以去离子（DI）水作为工作流体，对直径为25mm、长度为40mm的不同表面处理的铜圆柱体进行了池沸腾传热研究。实验结果表明，线间数量和混合润湿性图案的取向影响壁面过热度和传热系数（HTC）。与光滑表面相比，通过增加线间数量，传热系数得到了提高。从电荷耦合器件（CCD）相机获得的图像表明，与其他部分相比，在线间形成了更多的气泡。最下部为疏水的混合润湿性图案给出了最佳的传热系数（HTC）。实验结果表明，表面的气泡动力学是决定核态沸腾的一个重要因素。
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