中文摘要：

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。

英文摘要：

Droplet jumping induced by droplet coalescence on superhydrophobic surface was significant for enhancing condensation heat transfer of mixed vapor with non-condensable gas. However, theoretical analysis on droplet jumping phenomenon was not perfect yet. Large discrepancy between theoretical results and experimental results can be found. The dynamic evolution and the internal velocity field of droplet during droplet coalescence have been simulated by using lattice Boltzmann method, the distribution of released energy induced by droplet coalescence was also analyzed in this paper. The jumping height of the coalescent droplet induced by droplet coalescence on superhydrophobic surface was analyzed by energy conversation method based on the simulation results. In the model proposed in this paper, the work of adhesion, contact angle hysteresis, air friction, the change of the droplet centroid by droplet coalescence and the viscosity of the droplet were considered. The results indicated that there is a good agreement between theoretical and experimental results.