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格子Boltzmann方法具有微介观的特性,能够自动捕捉和追踪界面,在多相流领域有广阔的应用前景。对于伴有气液相变的传热问题,格子Boltzmann方法已有模型较少,其中有一部分是通过质量变化间接反映相变过程,不能真实反映温度场的演化和影响。本文采用了模拟多相流动和分离的自由能模型,结合基于Stefan边界的相变传热模型,考虑壁面自由能对流体与壁面间润湿性的影响,模拟了静态接触角、过热壁面的气泡生长和脱离,并进行了更接近真实沸腾过程的随机生成气泡的模拟,以及流动沸腾的气泡生长和脱离的模拟。
Lattice Boltzmann method has the characteristics of micro-mesoscopic, can automatically capture and track the interface, in the field of multiphase flow has broad application prospects. For the heat transfer problems associated with gas-liquid phase transitions, the lattice Boltzmann method has fewer models, some of which indirectly reflect the phase change process through mass changes and can not truly reflect the evolution and influence of the temperature field. In this paper, a free-energy model for simulating multi-phase flow and separation is used. Based on the phase-change heat transfer model based on the Stefan boundary, the influence of wall free energy on the wettability between the fluid and the wall is considered. Grown and detached, and simulated simulations of randomly generated bubbles closer to the true boiling process, as well as simulations of flow boiling and bubble detachment.