Surface wettability effects on evaporating meniscus in nanochannels
Surface wettability effects on evaporating meniscus in nanochannels
复制标题
表面润湿性对纳米通道中蒸发弯月面的影响
DOI：
10.1016/j.icheatmasstransfer.2022.106166
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发表时间：
2022
影响因子：
7
通讯作者：
Beskok, Ali
中科院分区：
文献类型：
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作者：
Ozsipahi, Mustafa;Akkus, Yigit;Beskok, Ali
对纳米通道中蒸发弯液面的自我调节作为各种应用热通量条件下表面润湿性的函数进行了系统研究。该模拟系统旨在产生稳态响应，从而可以产生稳定的弯月面区域。对铂通道中的氩流体进行非平衡分子动力学模拟。根据表面润湿性和施加的热通量，弯液面可以处于固定状态，也可以退回到通道内。对于后一种情况，吸附层的形成变得明显。较高的润湿性能够形成更厚的吸附层，从而减少弯液面的曲率半径和通道中的总体蒸发速率。吸附层降低了蒸发器的热阻，提供了更高的临界热通量。虽然吸附层的蒸发对于宏观系统可以忽略不计，但在纳米级系统中它可以贡献高达总蒸发质量的 80%。目前的工作提供了对超小通道中毛细管驱动薄膜蒸发的见解，这些发现对下一代热管理系统具有重要意义。
Systematic investigations of self-regulation of evaporating menisci in nanochannels are conducted as a function of the surface wettability under various applied heat flux conditions. The simulation system is designed to result in steady-state response so that a stable meniscus region can be produced. Non-equilibrium molecular dynamics simulations are performed for argon fluid in platinum channels. Depending on the surface wettability and the applied heat flux the meniscus can be in the pinned regime or it can recede inside the channel. Adsorbed layer formation becomes evident for the latter case. Higher wettability enables the formation of a thicker adsorbed layer reducing the radius of curvature of the meniscus and the overall evaporation rate in the channel. Adsorbed layer reduces the thermal resistance of the evaporator, providing a higher critical heat flux. While evaporation from the adsorbed layer is negligible for macroscopic systems, it can contribute up to 80% of the total evaporating mass in nanoscale systems. The current work provides insights into the capillary-driven thin-film evaporation in ultra-small channels and the findings are meaningful for next-generation thermal management systems.