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本文建立了一个模拟在弥散相液滴的扩散长大、碰撞凝并和Ostwald熟化等因素的作用下偏晶合金液-液相分离过程的二维格子玻尔兹曼方法(lattice Boltzmann method,LBM)模型.该模型结合了Shan-Chen的两相流模型和Qin的介观粒子相互作用势模型的优点,并在LB演化方程中引入了反映相变的源项.应用该模型模拟研究了偏晶合金液-液相分离过程中单液滴的生长、两液滴的合并和多液滴的生长规律.结果表明在两液相区中第二相单个液滴的生长是一个通过扩散从非平衡态到平衡态过渡的过程.两液滴合并过程的模拟结果表明表面张力会影响液滴的合并速度,模拟结果与理论预测的趋势相一致.多液滴生长过程的模拟结果表明液滴之间的碰撞凝并作用和Ostwald熟化会对液-液相分离过程产生重要影响.
In this paper, a two-dimensional Lattice Boltzmann method (LBM) was developed to simulate the liquid-liquid phase separation of the bulk amorphous alloy under the influence of diffusion and growth of dispersoid droplets, collisional condensation and Ostwald ripening. This model combines the advantages of Shan-Chen two-phase flow model and Qin mesoscopic particle interaction potential model, and introduces the source term that reflects the phase transition in the LB evolution equation.Using the model to simulate the partial The growth of single droplets, the combination of two droplets and the growth of multiple droplets during the liquid-liquid phase separation of the crystalline alloy show that the growth of single droplets of the second phase in the two- Equilibrium to equilibrium transition process.The simulation results show that the surface tension will affect the speed of the merger of the droplets.The simulation results are consistent with the trend of theoretical prediction.The simulation results of the multi-droplet growth process show that the droplet Collision and condensation between the role and Ostwald aging will have a significant impact on the liquid-liquid phase separation process.