Numerical study of droplet evaporation in an acoustic levitator
Numerical study of droplet evaporation in an acoustic levitator
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DOI：
10.1063/1.5017936
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发表时间：
2018-03-01
影响因子：
4.6
通讯作者：
Goetz, Michael
中科院分区：
文献类型：
--
作者：
Bansch, Eberhard;Goetz, Michael
我们提出了一种有限元方法来模拟悬浮在声悬浮装置中的液滴蒸发的所有相关过程。数学模型和数值实现考虑了液相和气相界面上的传热传质和声流对这一过程的影响，以及声辐射压力引起的液滴位移和变形。我们将这种数值方法应用于几个理论和实验实例，并将我们的结果与众所周知的球形液滴蒸发的d(2)定律和声流速度的理论预测进行了比较。我们研究了声流对悬浮装置中水蒸气和温度分布的影响，特别关注了出现的环形涡中的水蒸气分布。我们还比较了有声流和无声流时液滴的蒸发速率，以及蒸发速率与不同温度和声压级的关系。最后，考虑并研究了不同蒸发条件下蛋白质热损伤失活的简单模型及其对蛋白质损伤的影响。AIP出版社出版。
We present a finite element method for the simulation of all relevant processes of the evaporation of a liquid droplet suspended in an acoustic levitation device. The mathematical model and the numerical implementation take into account heat and mass transfer across the interface between the liquid and gaseous phase and the influence of acoustic streaming on this process, as well as the displacement and deformation of the droplet due to acoustic radiation pressure. We apply this numerical method to several theoretical and experimental examples and compare our results with the well-known d(2)-law for the evaporation of spherical droplets and with theoretical predictions for the acoustic streaming velocity. We study the influence of acoustic streaming on the distribution of water vapor and temperature in the levitation device, with special attention to the vapor distribution in the emerging toroidal vortices. We also compare the evaporation rate of a droplet with and without acoustic streaming, as well as the evaporation rates in dependence of different temperatures and sound pressure levels. Finally, a simple model of protein inactivation due to heat damage is considered and studied for different evaporation settings and their respective influence on protein damage. Published by AIP Publishing.