标题：Mixing of initially stratified miscible fluids in an eccentric stirred tank: Detached eddy simulation and volume of fluid study
作者：Feng Ling Yang;Shen Jie Zhou;Cui Xun Zhang;Gui Chao Wang
作者机构：[Yang, F.L] School of Mechanical Engineering, Shandong University, Jinan, 250061, China, Key Laboratory of High Efficiency and Clean Mechanical Manufa 更多
通讯作者地址：[Yang, FL]Shandong Univ, Sch Mech Engn, Jinan 250061, Peoples R China.
来源：The Korean journal of chemical engineering
关键词：Stirred Tank;Stratification;Miscible Fluids;Mixing;Detached Eddy Simulation (DES);Volume of Fluid (VOF)
摘要：Mixing of two stratified miscible fluids in an eccentric stirred tank agitated by a four pitched-blade turbine was studied by using the detached eddy simulation (DES) model and volume of fluid (VOF) method. The fluids were operated in the transitional and mildly turbulent flow regimes. Interfaces between the two miscible fluids during the mixing processes were captured and mixing times were computed. Effects of the Richardson number and eccentricity on the mixing times were quantificationally analyzed. Results show that the spatial and temporal variations of volume fractions of the fluids can be well captured by the method presented in this study. Mixing time increases with the increase of Richardson number. Effect of eccentricity on mixing time depends on Richardson number and the eccentric agitation scheme is not advisable to use to blend the low-viscosity miscible fluids starting from a stratified state, especially for lower Richardson values.