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Lattice Boltzmann simulation of periodic bubble nucleation, growth and departure from a heated surface in pool boiling

机译:池沸腾中周期性气泡成核,生长和离开加热表面的格子Boltzmann模拟

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摘要

Continuous and periodic bubble nucleation, growth, and departure from a heated surface in pool boiling is investigated numerically based on a newly developed phase-change lattice Boltzmann method (LBM). This new method is a direct simulation of liquid-vapor phase change heat transfer which is determined by the thermodynamic relation given by the equation of state. Two-dimensional numerical simulations based on this new phase-change LBM are carried out for nucleation of water on a microheater under constant wall temperature and constant heat flux conditions, respectively. Effects of gravity, contact angle and superheat on bubble departure diameter and release period under constant wall temperature conditions are illustrated. The three-phase contact line movement of the vapor bubble, as well as temperature profiles and flow fields inside and outside of the vapor bubble during boiling process are analyzed. Other important information, such as nucleation waiting time and nucleation temperature under constant heat flux conditions, which was unable to obtain by other numerical simulation methods, is obtained and analyzed in this paper for the first time.
机译:基于新开发的相变晶格玻尔兹曼方法(LBM),对池沸腾中连续和周期性的气泡成核,生长和从加热表面离开加热表面的现象进行了数值研究。这种新方法是对液体-蒸汽相变传热的直接模拟,该模拟由状态方程给出的热力学关系确定。基于这种新的相变LBM进行了二维数值模拟,分别用于在恒定壁温和恒定热通量条件下在微型加热器上对水进行成核。说明了重力,接触角和过热对恒定壁温条件下气泡离开直径和释放时间的影响。分析了汽泡在沸腾过程中的三相接触线运动以及汽泡内部和外部的温度分布和流场。本文首次获得并分析了其他重要信息,如恒定热通量条件下的成核等待时间和成核温度,这些是其他数值模拟方法无法获得的。

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