In order to obtain the influence law and microscale mechanism of droplet wetting state in microgravity, the model of nano-droplet on array micro-structured surface with different wettability and gravity was built and simulated by molecular dynamics. In conditions of no gravity, it was found that critical point of wetting state transition was closer to weak wettability surface with the decrease of low range micro-column height. What's more, the droplet contact angle increased first and then decreased with larger micro-column height when h* < 1.5. Under the action of gravity, the droplet Cassie state basically did not appear. The greater gravity made the droplet wetting state transition (from Cassie to Wenzel-Cassie to Wenzel) need lower requirements for surface wettability and micro-column height. Moreover, microgravity environment was conducive to droplets transition from Wenzel to Wenzel-Cassie or Cassie state, which promoting droplet drainage. Finally, a simple, effective and reliable method was put forward to judge the droplets wetting state under different gravity, with the aim of providing a technical support for controlling droplet to be in Wenzel-Cassie state under gravity.

为了获得微重力下液滴润湿状态的影响规律和微观机理，建立了具有不同润湿性和重力的微结构阵列微滴模型，并通过分子动力学模拟。发现在无重力条件下，随着低程微柱高度的减小，润湿状态转变的临界点更接近于弱润湿性表面。而且，当h *较大时，液滴接触角随着微柱高度的增加先增大然后减小<1.5。在重力的作用下，液滴的卡西状态基本上没有出现。更大的重力使液滴的润湿状态转变（从Cassie到Wenzel-Cassie到Wenzel）对表面的可湿性和微柱高度要求较低。此外，微重力环境有利于液滴从Wenzel转变为Wenzel-Cassie或Cassie态，从而促进了液滴的流失。最后，提出了一种简单，有效，可靠的方法来判断不同重力下的液滴润湿状态，为控制液滴在重力下的Wenzel-Cassie状态提供了技术支持。