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在通过引入精确差分方法的单组分多相格子Boltzmann模型的基础上耦合能量方程,并考虑流体与固壁间的相互作用力来调节气泡与固壁间的接触角,从而建立了一种新的描述气液相变的格子Boltzmann理论模型.为验证该模型的正确性,利用其对工质为水的相变过程进行了模拟,发现模拟结果与实验值符合良好;进而利用其验证Laplace定律,发现计算所得的水的表面张力与实验值甚为符合.为考察该模型处理复杂相变问题的能力,利用其对工质为水的池沸腾中的气泡生长过程进行模拟,发现气泡脱离直径与g-0.5成正比,脱离频率与g0.75成正比(g均为重力加速度),这与经验关系式及文献结果符合良好;此外,接触角的变化对气泡脱离直径影响不大,但气泡脱离频率与接触角成指数关系.
By introducing the single-component multi-phase lattice Boltzmann model of the exact difference method, the energy equation is coupled and the contact angle between the bubble and the solid wall is adjusted by considering the interaction force between the fluid and the solid wall, thus a new The lattice Boltzmann theory model describing the gas-liquid phase transition is used to verify the correctness of the model and to simulate the phase transition process with water as the working fluid. The simulation results agree well with the experimental data. And found that the calculated surface tension of water is in good agreement with the experimental data.In order to investigate the ability of the model to deal with complex phase transition problems and to simulate the bubble growth process in pool boiling with working fluid, And g-0.5 is proportional to the frequency is proportional to g0.75 (g are gravitational acceleration), which is in good agreement with the empirical relationship and the literature results; In addition, the contact angle changes on the bubble diameter is not small, but the bubble The frequency and contact angle are exponential.