ABSTRACT

The liquid contact angle on a solid surface is important in evaporation processes, which characterizes the wettability, and the spread of liquid films or droplets on the working surface. Thus, it critically affects heat and mass transfer, and evaporation performance accordingly. The evaporating droplet contact angle is complicated, accompanied by internal flow, heat/mass transfer, and phase change, and has received considerable attention in recent years. This paper summarizes the recent research progress of the measurement and simulation methods for determining the liquid contact angles of evaporation processes, including experimental approaches such as the sessile droplet, Wilhelmy and inclined plate methods, as well as numerical approaches such as the molecular dynamics, computational fluid dynamics, and lattice Boltzmann methods. The principles, applicable conditions, and limitations of these methods are analyzed and compared. This paper also discusses the measurement methods and effects of influencing factors related to the evaporating droplet contact angle, such as temperature and velocity distribution. Besides, it is discussed to enhance liquid evaporation by changing the droplet contact angle. Finally, a brief summary and suggestions for future work are presented.

摘要

固体表面上的液体接触角在蒸发过程中很重要，它表征了润湿性以及工作表面上的液膜或液滴的散布。因此，它严重影响传热和传质以及相应的蒸发性能。蒸发液滴的接触角很复杂，伴随着内部流动，热量/质量传递和相变，并且近年来受到了相当大的关注。本文总结了用于确定蒸发过程的液体接触角的测量和模拟方法的最新研究进展，包括无固定液滴，Wilhelmy和斜板方法等实验方法，以及分子动力学，计算等数值方法。流体动力学和格子Boltzmann方法。原则 分析并比较了这些方法的适用条件和局限性。本文还讨论了与蒸发液滴接触角相关的影响因素（如温度和速度分布）的测量方法和影响因素。此外，讨论了通过改变液滴接触角来增强液体蒸发。最后，对未来的工作作了简要的总结和建议。