摘要
应用商业计算流体力学软件CFX对搅拌槽内的流场进行了模拟 ,并与PIV测试结果进行了比较 ,流型吻合良好 .速度分量的对比结果表明不同情况与各种模型的吻合情况不尽相同 ,标准k ε双方程模型、RNGk
Stirred mixing vessels are widely used in chemical industry for processes involving the mixing or/and chemical reactions of liquids,gases or solids.The ability to numerically simulate the whole flow field is vital to optimal design.Previous attempts have adopted a steady-state semi-empirical analysis requiring experimentally-based inputs of some form.In the present work, the CFD code CFX-4 is used for the full field computation for both the fluid within the impeller passages and the fluid outside.The model solves the unsteady ensemble-averaged continuity and momentum equations(Reynolds equations)with turbulence effects accounted for by k-ε model, RNG k-ε model,and algebraic stress model.The equations are discretised by the finite-volume approach.The mesh is divided into two parts which are fixed to their respective frames of reference, one being stationary and the other rotating with the impeller. At the interface between these two parts the rotating mesh slides over the fixed one at each time interval.The computation proceeds simultaneously over the whole flow field and the solutions in both rotating and stationery domains are coupled at all times.Comparisons between the predictions and the experimental data measured by particle imaging velocimetry(PIV)show that all the major flow patterns are well reproduced. The quantitative comparisons show encouraging agreement.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第5期612-618,共7页
CIESC Journal
基金
国家自然科学基金资助项目 (No 2 99760 0 2)~~
关键词
搅拌槽
流场测量
PIV
数值模拟
湍流模型
stirred tank,flow field measurement,PIV,numerical simulation,turbulent model
