基于混合热格子Boltzmann方法有限热源加热气泡动力学模拟  

Dynamic Simulation of Bubbles Heated by Finite Heat Source Based on Mixed Thermal Lattice Boltzmann Method

作　　者：金志浩[1] 章港 战洪仁[1] 李帅[1] 王立鹏[1] 张志刚[1] JIN Zhi-hao;ZHANG Gang;ZHAN Hong-ren;LI Shuai;WANG Li-peng;ZHANG Zhi-gang(School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China)

机构地区：[1]沈阳化工大学机械与动力工程学院,沈阳110142

出　　处：《科学技术与工程》2022年第5期1842-1851,共10页Science Technology and Engineering

基　　金：国家自然科学基金(21978173);辽宁省教育厅自然科学基金(LJ2020017)。

摘　　要：为探究不同润湿性表面单气泡动力学特性,通过引入差分方法的单组分多相格子Boltzmann模型,耦合能量方程构成了气液相变模型,模拟了不同润湿性表面单气泡形成过程周围流场与温度场细观,阐述了气泡生长脱离机理;研究了润湿性、过热度、有限热源长度对气泡动力学影响。结果表明,在相同过热度下,疏水壁面气泡生长速度大于亲水壁面。气泡脱离直径和脱离时间随着接触角增加而增加,亲水表面气泡脱离直径随着有限热源长度增加而增加,脱离时间随长度增加而减小。疏水表面气泡脱离直径与有限热源长度无关,脱离时间随加热长度增加小幅度减小。在不同的过热度下,亲水壁面气泡脱离直径随着过热度增加而增加,脱离时间随着过热度增加而减小。过热度对疏水壁面气泡脱离直径影响不大,但是随着过热度增加,脱离时间明显减小。模拟结果为研究强化表面沸腾传热及表面润湿性的选择提供理论依据。In order to explore the dynamic characteristics of single bubble on different wettability surfaces,the gas-liquid phase transition model was formed by introducing the single component multiphase lattice Boltzmann model of difference method and coupling the energy equation.The meso of flow field and temperature field around the formation process of single bubble on different wettability surfaces were simulated,and the bubble growth and separation mechanism was expounded.The effects of wettability,superheat and finite heat source length on bubble dynamics were studied.The results show that the bubble growth rate on the hydrophobic wall is higher than that on the hydrophilic wall under the same superheat.The bubble detachment diameter and detachment time increase with the increase of the contact Angle,the bubble detachment diameter on the hydrophilic surface increases with the increase of the finite heat source length,and the detachment time decreases with the increase of the length.The bubble detachment diameter on hydrophobic surface is independent of the finite heat source length,and the detachment time decreases slightly with the increase of heating length.Under different superheat conditions,the bubble escape diameter on the hydrophilic wall increases with the increase of superheat,and the escape time decreases with the increase of superheat.The superheat has little effect on the bubble detachment diameter on the hydrophobic wall,but the detachment time decreases obviously with the increase of superheat.The simulation results provide theoretical support for the further realization of complete boiling process simulation of finite heat source.

关 键 词：混合热格子Boltzmann 有限热源 亲疏水性 单气泡动力学 

分 类 号：TF741.33[冶金工程—钢铁冶金]