基于LBM的均匀电场池沸腾单气泡动力学模拟

doi:10.19596/j.cnki.1001-246x.8475

摘要/Abstract

摘要：

采用格子玻尔兹曼方法(LBM), 在气-液相变模型的基础上, 耦合理想电介质模型, 模拟均匀电场作用下池沸腾单气泡成核、生长、脱离过程, 详细研究重力加速度和电场强度对气泡动力学的影响。结果表明: 在重力加速度相同的情况下, 随着电场强度的增加, 气泡的脱离直径与脱离时间随之减小, 壁面平均热流增加。随着重力加速度减小, 壁面平均热流减少, 电场强度对于气泡脱离频率的影响更加显著。气泡在均匀电场中形状发生改变, 它将沿着电场线的方向拉伸, 变得更加细长, 电场强度与气泡的纵横比和高度呈线性相关。

关键词: 格子玻尔兹曼方法, 池沸腾, 均匀电场, 气泡动力学

Abstract:

Lattice Boltzmann method (LBM) is used in a coupled perfect dielectric model and liquid-vapor phase-change model to simulate nucleation, growth, and separation process of a single bubble in pool boiling under uniform electric field. Effects of gravitational acceleration and electric field on bubble dynamics are studied in detail. It shows that under same gravitational acceleration, with the increase of electric field intensity, the bubble departure diameter decreases and the bubble release frequency increases, and the averaged wall heat flux increases. With the decrease of gravitational acceleration, the averaged wall heat flux decreases as well, and the electric field has significant influence on the bubble release frequency. In addition, the bubble deforms in a uniform electric field, and it stretches along the direction of electric field to become slender. The electric field intensity is linearly related to the aspect ratio and height of the bubble.

Key words: lattice Boltzmann method, pool boiling, uniform electric field, bubble dynamics

张浏斌, 单彦广, 戎志成. 基于LBM的均匀电场池沸腾单气泡动力学模拟[J]. 计算物理, 2022, 39(5): 537-548.

Liubin ZHANG, Yanguang SHAN, Zhicheng RONG. Single Bubble Dynamics in Pool Boiling Under Uniform Electric Field: LBM Simulation[J]. Chinese Journal of Computational Physics, 2022, 39(5): 537-548.

图/表 17

图1 计算区域示意图

Fig.1 A schematic of the computation domain

图2 静态接触角和gs的关系

Fig.2 Relation between static contact angle and gs

图3 等效直径与实验结果

Fig.3 Equivalent diameter and experimental results

图4 单气泡生长和脱离的数值结果和实验

Fig.4 Numerical results and experimental observations of single bubble growth and departure

图5 重力加速度与气泡脱离直径、脱离周期的关系(a) 脱离直径; (b)脱离时间

Fig.5 Relations between gravity and bubble separation diameter and separation time (a) separation diameter, (b) separation time

图6 电场强度与电场流线分布

Fig.6 Distribution of electric field intensities and electric field streamlines

图7 电场强度分布(a) y=2.5D0; (b) x=2.5D0

Fig.7 Distributions of electric field intensities at (a) y=2.5D0; (b) x=2.5D0

图8 无电场时不同重力加速度下气泡轮廓(a) G = 0.00005; (b) G = 0.00001; (c) G = 0.00002

Fig.8 Evolutions of bubble contour under different gravitational accelerations without electric field (a) G = 0.00005; (b) G = 0.00001; (c) G = 0.00002

图9 G = 0.00002时，不同电场强度下池沸腾气泡轮廓的演变(a) V0=10; (b)V0=20; (c)V0=30

Fig.9 Evolutions of bubble contour during pool boiling under different electric field intensities as G = 0.00002 (a) V0=10; (b) V0=20; (c)V0=30

图10 电场力分布

Fig.10 Electric field force distribution

图11 G = 0.00002时池沸腾气泡周围速度矢量分布(a) V0=0; (b) V0=30

Fig.11 Distributions of velocity vectors around a vapor bubble during pool boiling at G = 0.00002 (a) V0=0; (b) V0=30

图12 不同重力加速度下，电场强度对气泡脱离直径的影响

Fig.12 Effect of electric field intensity on bubble departure diameter under different gravitational accelerations

图13 不同重力加速度下，电场强度对气泡脱离时间的影响

Fig.13 Effect of electric field intensity on bubble release frequency under different gravitational accelerations

图14 气泡纵横比

Fig.14 Aspect ratio of bubble

图15 不同电场强度下气泡高度和纵横比随时间变化(a) 纵横比; (b) 高度

Fig.15 Effect of electric field intensity on the evolution of bubble height and AR (a) AR; (b) height

图16 不同重力加速度下，气泡脱离时纵横比和高度随着电场强度变化(a) 纵横比; (b) 高度

Fig.16 Effect of electric field intensity on bubble detachment height and AR under different gravitational acceleration (a) AR; (b) height

图17 不同电场强度下，壁面平均热流随着重力加速度的变化

Fig.17 Average wall heat flux as functions of acceleration of gravity under different electric field intensity

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