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超疏水表面上液滴合并诱导液滴弹跳对强化含不凝气的蒸气冷凝具有重要的作用,但是,液滴合并诱导液滴弹跳现象的理论分析还不够完善,理论计算结果与实验值相差甚远。本文利用格子Boltzmann多相流模型模拟了液滴合并过程液滴的动态演化以及合并过程中液滴内部的速度场分布,分析了液滴合并过程中释放的表面自由能的分配情况。基于模拟结果,利用能量守恒的方法对超疏水表面液滴合并诱导液滴弹跳高度进行了理论分析,考察了表面黏附功、接触角滞后、空气阻力、液滴合并质心变化消耗的能量以及液滴自身黏性耗散的影响。结果显示理论计算值与实验值吻合良好。
However, the theoretical analysis of liquid droplet induced droplet bouncing phenomenon is still not perfect, the theoretical calculation results and the experimental value of a very different far. In this paper, the lattice Boltzmann multiphase flow model was used to simulate the dynamic evolution of droplets during the droplet consolidation process and the distribution of the velocity field inside the droplets during the merging process. The distribution of surface free energy released during the droplet merging process was analyzed. Based on the simulation results, a theoretical analysis of the droplet jumping height induced by superhydrophobic surface droplets was conducted by using energy conservation method. The surface adhesion work, contact angle hysteresis, air resistance, energy consumed by the droplet combined with centroid change, The impact of its own viscosity dissipation. The results show that the calculated value is in good agreement with the experimental data.