【摘要】 为研究垂直振动液滴内部流动和蒸发特性，采用VOF-CSF(流体体积函数和连续表面张力)方法，模拟4种共振模态(2、4、6、8)下液滴在恒温平板与高温空气中蒸发时内部流动与蒸发特性变化过程。结果表明：恒温平板上液滴不均匀的界面温度分布使液滴表面形成张力梯度，界面流体在此梯度下从高温区流向低温区，形成Marangoni流；液滴在模态2和4时内部出现Y型流动，在模态6和8时则呈现2个对称大尺寸的涡流动，且液滴在第4模态下内部平均流速最高。高温空气中液滴在第4模态下处于稳定蒸发时的蒸发速率最快，第8、6、2模态以及自然蒸发的蒸发速率依次小于第4模态，且共振频率处液滴的蒸发速率大于相邻频率下的蒸发速率。更多还原

【Abstract】 In order to study the internal flow and evaporation characteristics of vertical vibrating droplet, the volume of fluid of gas-liquid two-phase fluid and continuous surface tension(VOF-CSF) method were used to simulate the internal flow and evaporation characteristics of droplet under four resonance modes(2,4,6,8) in a constant temperature flat plate and high temperature air. The results show that the uneven temperature distribution of droplet interface on the constant temperature plate casuses a tension gradient on the surface of the droplet, and the interface fluid flows from the high temperature region to the low temperature region under this gradient, forming a Marangoni flow; Y-shaped flow appears inside the droplet in mode 2 and mode 4, while two symmetrical large size eddy currents appear in mode 6 and mode 8,and the average velocity inside the droplet is the highest in mode 4. In the high temperature air, the evaporation rate of the droplet is the fastest when it is in stable evaporation in mode 4, the evaporation rate in mode 8, 6, 2 and nature evaporation is successively smaller than that in mode 4, and the evaporation rate of the droplet at the resonance frequencies is the fastest than that in the neighbouring frequency.更多还原