摘要
建立了竖直管降膜流动的二维模型,采用RNG κ-ε湍流模型、VOF模型,对管内的降膜流动进行了CFD研究,得到了稳定前后的液膜、速度分布。研究发现,沿管长方向的流动稳定后,依次分为平稳区、小幅波动区、大幅震荡区,在给定流速下平稳区、波动区膜厚为0.63 mm、0.23~1.5 mm。在平稳区不同位置处液膜流速在膜厚方向变化一致,沿管长有增大趋势,最大速度在膜内,流动稳定后分布变化不大。最后将模拟得到的膜厚与学者数据进行了对比,结果可靠。
A two-dimensional model was established for studying the flow characteristic of vertical tube' s falling film. Fluent was used to simulate the flow film with RNG κ-ε model and VOF model,the film thickness and the film velocity were analyzed. There were different characteristics in the film distribution considering different distances from entrance as well as time. Three kinds of flow patterns were founded after the steady flow,which were the smooth flow,the slight wave flow and the shock flow. The distribution of liquid film velocity had maximal value in the film,and there was a tendency to increase in the flow process. The film thickness at different Reynolds number was compared with other researchers' correlation formula,and the result was reliable.
出处
《广州化工》
CAS
2018年第3期65-68,共4页
GuangZhou Chemical Industry
基金
2013年国家科技支撑项目计划(编号:2013BAC12B01)
四川大学德阳校市科技合作专项资金(编号:HZYF201513)
关键词
降膜流动
液膜厚度
液膜速度
数值模拟摇
falling film flow
liquid film thickness
liquid film velocity
numerical simulation
