Shandong Science ›› 2021, Vol. 34 ›› Issue (4): 9-13.doi: 10.3976/j.issn.1002-4026.2021.04.002

• Oceanographic Science, Technology and Equipment • Previous Articles     Next Articles

Influence of a baffle structure on the stirring effect of a biological stirred tank

DONG Wei,HAN Shao-binLIU Nai-you   

  1. Shandong Provincial Key Laboratory of Marine Monitoring Instrument Equipment Technology,National Engineering and Technological Research Center of Marine Monitoring Institute of Oceanographic Instrumentation, Qilu University of Technology(Shandong Academy of Sciences), Qingdao 266061, China
  • Received:2020-10-26 Online:2021-07-30 Published:2021-07-30
  • About author:董巍(1982—),男,助理工程师,研究方向为海洋仪器及设备研发。E-mail:361928448@qq.com

Abstract: Using Fluent, the difference in the stirring effect of a biological stirred tank with and without baffle was calculated and compared. Based on the finite volume method, the RANS(Reynolds-averaged Navier-Stokes model was used to simulate the flow field in the biological stirred tank, and the velocity distribution, pressure distribution and turbulent kinetic energy in the stirring process were obtained. The structural morphology of the flow field was analyzed. The results show that the larger the baffle width, the greater the velocity fluctuation, the greater the velocity vector change, and the greater the turbulent kinetic energy, which is helpful in improving the stirring effect of the biological stirred tank. According to the pressure distribution analysis, with or without a baffle, the minimum pressure in the biological stirred tank is 0.12 m away from the bottom of the tank. The minimum pressure with a baffle is lower than that without a baffle, The velocity vector in the flow field of the stirred tank with baffle exhibits a stronger cyclone effect, which could result in more intense chemical reaction occurring during the stirring process.

Key words: baffle structure, stirred tank;velocity distribution; velocity vector, pressure distribution, RANS model, turbulent kinetic energy

CLC Number: 

  • TQ630.5+4