基于混合热格子玻尔兹曼模型的液滴蒸发数值模拟

Numerical simulation of the droplet evaporation based on the hybrid thermal lattice Boltzmann model

采用格子玻尔兹曼方法(LBM)的单组分伪势模型与有限差分耦合的混合热格子玻尔兹曼模型(TLBM)对液滴蒸发过程进行了研究。首先,通过对液滴在方腔内蒸发过程进行模拟,验证了所采用计算方法及程序的有效性。随后,模拟了液滴撞击高温壁面后的蒸发过程,研究了壁面温度、液滴邦德数和液滴雷诺数对蒸发过程的影响。结果表明,壁面温度、液滴邦德数和液滴雷诺数的增加均会造成液滴撞击高温壁面后蒸发速率的增大。

In this paper, the hybrid thermal lattice Boltzmann model (TLBM) based on the singlecomponent pseudo-potential model of lattice Boltzmann method (LBM) and finite difference coupling was used to study the droplet evaporation process. Firstly, the effectiveness of the calculation method and the related program was verified by simulating the droplet evaporation process in the cavity. Secondly, the evaporation process of the droplet collision on the hightemperature wall was simulated. The effects of wall temperature, droplet Bond number and droplet Reynolds number on the evaporation process were studied. The results showed that the rise of wall temperature, droplet Bond number and droplet Reynolds number would increase the evaporation rate after the collision of the droplet on the high-temperature wall.