真空下同轴圆筒间分子蒸馏过程的数值模拟

Simulation of Molecular Distillation between Coaxial Cylinder at High Vacuum

在源于Boltzmann方程的BGK模型方程的基础上,建立了计算多组分稀薄气体流动的数学模型,揭示了蒸发空间气体的密度、温度、速度和压力的变化规律.运用该模型对同轴柱面之间的蒸发与冷凝过程进行了数值模拟,考察了惰性气体存在对该过程的影响,着重讨论了蒸发器结构尺寸、残留惰性气体分压等因素对蒸发效率和分离因数的影响.

On the basis of the Bhatnagar-Gross-Krook equation, a new scheme for multi-component flow calculations between two closed surfaces of evaporation and condensation was developed. This model reveals the profiles of density, temperature, velocity and concentration of vapor in the space between evaporation surface and condensation surface. It was used to simulate the vapor behaviors of the dibutylphthalate-dibutylsebacate (DBP-DBS) mixture system in the presence of an inert gas. The effects of inert gas pressure and construction parameters on evaporation efficiency and separation factor were discussed.