Abstract

Water droplet flows on surfaces have been numerically investigated using a new hybrid dynamic contact angle approach and four others, which include Kistler, Yokoi, Cox and OpenFOAM models, and the computations are compared with the experimental data. Two surface types, hydrophobic and hydrophilic are used to show the influence of surface wettability. Results put in evidence that the motion of droplets is very dependent on the formulation of the dynamic contact angle in relation to the wettability of surfaces. On the hydrophobic surface, the Yokoi and Cox models deviate significantly from the experimental data, whereas hybrid (proposed model) can be described as the most successful model. On the hydrophilic surface, the hybrid model imitates droplet dynamics very successfully, but the Yokoi model shows the best agreement with the experiments. It is clearly seen that the hybrid model can be accepted as one of the most successful models in multi-phase flow simulations with three-phase points.

摘要

已经使用新的混合动态接触角方法和其他四种方法（包括 Kistler、Yokoi、Cox 和 OpenFOAM 模型）对表面上的水滴流动进行了数值研究，并将计算结果与实验数据进行了比较。两种表面类型，疏水性和亲水性用于显示表面润湿性的影响。结果表明，液滴的运动非常依赖于与表面润湿性相关的动态接触角的公式。在疏水表面上，Yokoi 和 Cox 模型显着偏离了实验数据，而混合模型（提出的模型）可以说是最成功的模型。在亲水表面上，混合模型非常成功地模拟了液滴动力学，但横井模型显示出与实验的最佳一致性。