Cui Wenbin, Cao Yang, Wang Shoupei, Zhang Tianci, Ma Hongbin, Chang Chao, Liang Dalong, Dong Jingming
College of Marine Engineering, Dalian Maritime University, Dalian 116016, China.
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA.
Micromachines (Basel). 2022 Dec 28;14(1):76. doi: 10.3390/mi14010076.
To better understand the evaporation of a non-spherical droplet, a two-dimensional simulation was conducted to investigate the evaporation on the asymmetric cross-section of non-spherical sessile droplets, which are characterized by two curvatures with two different contact angles on both sides. The temperature distribution, internal flow, and evaporation flux distribution at a quasi-steady state were revealed to be different from the spherical droplets. When heated from the substrate, the lowest surface temperature moves to the side of higher curvature or larger contact angle, forming a single vortex in the droplet. This single-vortex formation continues to be enhanced by enlarging the contact angle discrepancy. Unlike spherical droplets, the smaller curvature side of a non-spherical sessile droplet will release more evaporation flux. In addition, it is found that the non-spherical sessile droplets could surpass the spherical sessile droplets in evaporation flux.
为了更好地理解非球形液滴的蒸发过程，进行了二维模拟，以研究非球形固着液滴不对称横截面上的蒸发情况，这些液滴的特征是两侧具有两个不同接触角的两种曲率。结果表明，准稳态下的温度分布、内部流动和蒸发通量分布与球形液滴不同。当从基底加热时，最低表面温度会移向曲率较大或接触角较大的一侧，在液滴中形成单个涡旋。通过扩大接触角差异，这种单个涡旋的形成会持续增强。与球形液滴不同，非球形固着液滴曲率较小的一侧会释放更多的蒸发通量。此外，还发现非球形固着液滴的蒸发通量可能超过球形固着液滴。
