关键词: 薄膜蒸发器, 流体流动, 数值模拟, 边界层, 计算流体力学

Abstract: The calculation model of thin film evaporator (TFE) was developed, the flow of water and viscous fluid was simulated using CFX 4.4 software and the velocity distribution was obtained. The results show that the rotor speed and feeding rate have great effects on the fluid flow of TFE. The material exchange between the fillet and film can be promoted by increasing the rotor speed. There is one common optimum feeding rate under different rotor speeds for different fluids. At this feeding rate, the mean velocity in the fillet section reaches the maximum value. For water, the ratio of flow boundary layer thickness to film thickness is the minimum under the optimum feeding rate. Difference exists for the axial velocity distribution between viscous fluid and water, and no obvious flow boundary layer forms for viscous fluid.

Key words: thin-film evaporator, fluid flow, numerical simulation, boundary layer, CFD