화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.30, No.10, 1843-1854, October, 2013
DOI10.1007/s11814-013-0154-0  Export Citation
Mixing of initially stratified miscible fluids in an eccentric stirred tank: Detached eddy simulation and volume of fluid study
Feng Ling Yang1, 2, †, Shen Jie Zhou1, 2, Cui Xun Zhang3, and Gui Chao Wang1
  • 1School of Mechanical Engineering, Shandong University, Jinan 250061, China
  • 2Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, Jinan 250061, China
  • 3Shandong Province Academy of Sciences, Tianli Drying Equipment Incorporated Company, Jinan 250014, China
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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.
Keywords:Stirred Tank;Stratification;Miscible Fluids;Mixing;Detached Eddy Simulation (DES);Volume of Fluid (VOF)
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