化工学报 ›› 2023, Vol. 74 ›› Issue (12): 4829-4839.DOI: 10.11949/0438-1157.20231090
收稿日期:
2023-10-24
修回日期:
2023-11-28
出版日期:
2023-12-25
发布日期:
2024-02-19
通讯作者:
甘云华
作者简介:
陈宁光(1994—),男,博士研究生,785508194@qq.com
基金资助:
Ningguang CHEN(), Yunhua GAN()
Received:
2023-10-24
Revised:
2023-11-28
Online:
2023-12-25
Published:
2024-02-19
Contact:
Yunhua GAN
摘要:
固着液滴蒸发在各种应用中起着重要作用,然而数值模拟研究电场对蒸发液滴内部流动及传热影响还有待探索。结合相变和漏电介质模型提出了一个多松弛格子Boltzmann模型,并与实验结果进行了对比验证。运用该模型研究了电场对液滴蒸发过程的形态变化、电场力分布、流动和传热的影响。结果表明,液滴沿电场方向被拉伸,其高度随电毛细数(CaE)的增加而增加,电场扩大了液滴的内部流动范围,使其流动更加均匀。当CaE=0.4时,Peclet数是无电场时的3.3倍,但相对于热传导,液滴的内部流动对温度分布没有显著影响。由于电场拉伸液滴,导致传热热阻增加,因此蒸发所需的时间增加。电场的作用是改变液滴几何形态,而接触线密度的增加才是影响平均热通量的主要原因。
中图分类号:
陈宁光, 甘云华. 基于格子Boltzmann方法的荷电液滴蒸发及传热研究[J]. 化工学报, 2023, 74(12): 4829-4839.
Ningguang CHEN, Yunhua GAN. Study on evaporation and heat transfer of charged sessile droplet based on lattice Boltzmann method[J]. CIESC Journal, 2023, 74(12): 4829-4839.
变量 | 相对不确定度/% |
---|---|
电极间距L | ±0.1 |
液滴体积 | ±0.2 |
电压V (5 kV) | ±0.12 |
电场强度E (0.5 kV/mm) | ±1 |
表1 各实验测量值的相对不确定度
Table 1 Relative uncertainties of measurement values
变量 | 相对不确定度/% |
---|---|
电极间距L | ±0.1 |
液滴体积 | ±0.2 |
电压V (5 kV) | ±0.12 |
电场强度E (0.5 kV/mm) | ±1 |
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