初始非饱和液体物料冷冻干燥二维数值验证

2D Numerical Verification on Freeze-drying of Initially Unsaturated Material Frozen from Aqueous Solution

为提高过程经济性,对初始非饱和液体物料冷冻干燥这一思想进行二维数值验证。建立含湿多孔介质冷冻干燥二维柱坐标数学模型,使用有限体积法对控制方程组进行数值求解。模拟结果显示,初始非饱和冷冻物料确实能够有效减少干燥时间,达到强化冷冻干燥过程的目的,干燥时间随着初始孔隙率的增大而减小。对模拟得到的不同时刻物料内部饱和度和温度的侧形进行分析。

Freeze-drying of initially unsaturated frozen material was numerically verified in order to improve process economy. A 2D mathematical model of heat and mass transfer for freeze-drying of porous material was derived. The finite volume method with fully implicit scheme was adopted for discretization of governing equations. Simulation results show that freeze-drying can be indeed enhanced using the initially unsaturated frozen material, and drying time decreases with the increase in initial porosities. Distributions of temperature and saturation within the material were obtained and analyzed.