论文标题
多孔纳米通道上的液滴蒸发，用于高热通量耗散
Droplet Evaporation on Porous Nanochannels for High Heat Flux Dissipation
论文作者
论文摘要
在35oC至90oC的温度下，在加热表面上研究了多孔纳米通道中的液滴芯和蒸发。制造的几何形状由高度为728 nm的交叉连接的纳米通道组成，并在每个通道交叉路口都存在直径2 um；毛孔允许从放置在顶部表面的液滴中的水进入通道。液滴体积也有所不同，总共进行了16例实验病例。在高表面温度下获得诸如邪恶距离，毛细管压力，粘性电阻和传播系数之类的芯吸特性。从液滴实验中估算了来自纳米通道/微孔的蒸发通量，但也可以通过一组新的实验独立确认，在这些实验中，通过微管连续将水送入样品，使其与蒸发率匹配。热通量高达〜294 w/cm2，是从通道和毛孔中实现的。实验发现用于评估在喷雾冷却施用中多孔纳米通道几何形状的使用，并且在低于核定的温度下，能够耗散高达〜77 W/cm2的高热通量，从而突出了捏造几何学的热管理电位。
Droplet wicking and evaporation in porous nanochannels is experimentally studied on a heated surface at temperatures ranging from 35oC to 90oC. The fabricated geometry consists of cross-connected nanochannels of height 728 nm with micropores of diameter 2 um present at every channel intersection; the pores allow water from a droplet placed on the top surface to wick into the channels. Droplet volume is also varied and a total of 16 experimental cases are conducted. Wicking characteristics such as wicked distance, capillary pressure, viscous resistance and propagation coefficient are obtained at the high surface temperatures. Evaporation flux from the nanochannels/micropores is estimated from the droplet experiments, but is also independently confirmed via a new set of experiments where water is continuously fed to the sample through a microtube such that it matches the evaporation rate. Heat flux as high as ~294 W/cm2 is achieved from channels and pores. The experimental findings are applied to evaluate the use of porous nanochannels geometry in spray cooling application, and is found to be capable of dissipating high heat fluxes upto ~77 W/cm2 at temperatures below nucleation, thus highlighting the thermal management potential of the fabricated geometry.
