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交变电场作用下单液滴蒸发的分子动力学模拟

王群 富庆飞

王群, 富庆飞. 交变电场作用下单液滴蒸发的分子动力学模拟[J]. 力学学报, 2021, 53(5): 1324-1333. doi: 10.6052/0459-1879-20-410
引用本文: 王群, 富庆飞. 交变电场作用下单液滴蒸发的分子动力学模拟[J]. 力学学报, 2021, 53(5): 1324-1333. doi: 10.6052/0459-1879-20-410
Wang Qun, Fu Qingfei. MOLECULAR DYNAMICS SIMULATION OF SINGLE DROPLET EVAPORATION UNDER ALTERNATING ELECTRIC FIELD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(5): 1324-1333. doi: 10.6052/0459-1879-20-410
Citation: Wang Qun, Fu Qingfei. MOLECULAR DYNAMICS SIMULATION OF SINGLE DROPLET EVAPORATION UNDER ALTERNATING ELECTRIC FIELD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(5): 1324-1333. doi: 10.6052/0459-1879-20-410

交变电场作用下单液滴蒸发的分子动力学模拟

doi: 10.6052/0459-1879-20-410
基金项目: 1)国家自然科学基金(11922201);北京航空航天大学高性能计算中心支持项目
详细信息
    作者简介:

    2)富庆飞, 教授, 主要研究方向: 流体雾化. E-mail:fuqingfei@buaa.edu.cn

    通讯作者:

    富庆飞

  • 中图分类号: TK124

MOLECULAR DYNAMICS SIMULATION OF SINGLE DROPLET EVAPORATION UNDER ALTERNATING ELECTRIC FIELD

  • 摘要: 利用分子动力学方法研究了正弦形式的交变电场对三维悬浮水滴在超临界氮气环境下蒸发特性的影响, 主要考虑了电场幅值和频率对液滴蒸发寿命和液滴瞬时蒸发速率的影响. 其中水滴由8000个水分子组成, 环境气体由27000个氮气分子组成. 首先利用分子动力学方法模拟计算了不同状态下水的物性参数以及亚临界条件下匀强电场对液滴蒸发特性的影响, 从而验证了分子模型和蒸发模型的正确性. 接着模拟了在不同幅值和频率的交变电场作用下水滴在氮气环境下的蒸发过程, 结果表明, 相比于无电场或匀强电场, 交变电场能够更显著地促进水滴的蒸发. 在频率一定时, 随着电场幅值的增大, 液滴的蒸发速率不断升高, 蒸发寿命不断下降, 且液滴的瞬时蒸发速率、液滴温度、水分子的排列结构等参数都会产生频率为所加电场二倍的振荡特性, 且电场幅值越大, 振荡幅值也越大. 而在电场幅值一定时, 随着频率的增大, 液滴蒸发寿命和速率并不是单调变化的, 而是在频率$f=5$GHz时, 分别达到一个极大值和极小值, 文中从液滴能量和分子排列结构两个方面解释了产生了这一现象的原因.

     

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出版历程
  • 收稿日期:  2020-12-01
  • 刊出日期:  2021-05-18

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