Capillarity of Rectangular Micro Grooves and Their Application to Heat Pipes
Capillarity of Rectangular Micro Grooves and Their Application to Heat Pipes
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发表时间：
2005
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通讯作者：
Horng-Jou Wang;Hsin-Chang Tsai;Hwang-Kuen Chen;T. Shing
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作者：
Horng-Jou Wang;Hsin-Chang Tsai;Hwang-Kuen Chen;T. Shing
本文对矩形截面微槽的毛细现象进行了理论和实验研究。采用亥姆霍兹自由能法预测了垂直放置凹槽并将底端插入液体中时的毛细现象。在实验中，首先利用光刻法在厚光刻胶上形成微槽，然后在其表面沉积一层薄铜层，以改善液固界面的亲水性。结果表明，理论和实验结果是一致的。此外，还研究了微槽道热管的毛细极限。计算了槽宽和槽数对最大毛细泵压、摩擦力和重力引起的压降所贡献的毛细极限的影响。一个可行的几何形状范围内的微槽的热管设计，以传输特定的热率可以确定这些开发的工具。
The capillarity of micro grooves with rectangular cross-section is studied theoretically and experimentally in this paper. The Helmholtz free energy method is used to predict the capillarity as the groove is placed vertically and inserted the bottom end into the liquid. In the experiment, micro grooves are first constructed by the thick photoresist patterned by photolithography method and then a thin copper layer is deposited on their surface to improve the hydrophilic property of liquid-solid interface. It is shown that the theoretical and experimental results are in good agreement. Furthermore, the capillary limits of micro grooved heat pipes are investigated. The effects of groove’s width and number on the capillary limit contributed from the maximum capillary pumping pressure and the pressure drops due to the friction and gravitational force are calculated. A workable geometry range of micro grooves for a heat pipe designed to transport a specific heat rate can be determined by these developed tools.