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http://dx.doi.org/10.5293/KFMA.2002.5.2.029

Numerical Study on Flow Patterns in a Stirred Tank with Impeller Types  

Song, Gil-Sub (수자원연구소)
Oh, Sueg-Young (수자원연구소)
Oh, Jeong-Jin (우송공업대학 컴퓨터응용기계계열)
Publication Information
The KSFM Journal of Fluid Machinery / v.5, no.2, 2002 , pp. 29-35 More about this Journal
Abstract
The present study is concerned with the flow patterns induced by various impellers in a rectangular tank. Impellers are FBT (Flat blade turbine), PBT (Pitched blade turbine), Shroud turbine, Rushton turbine, and Helical ribbon turbine types. The solutions of flows in moving reference frames require the use of 'moving' cell zone. The moving zone approaches are based on MRF (Multiple reference frame), which is a steady-state approximation and sliding method, which is an unsteady-state approximation. Numerical results using two moving zone approaches we compared with experiments by Ranade & Joshi, which have done extensive LDA measurements of the flow generated by a standard six-bladed Rushton turbine in a cylindrical baffled vessel. In this paper, we simulated the flow patterns with above-mentioned moving zone approaches and impellers. Turbulence model used is RNG $k-{\epsilon}$ model. Sliding-mesh method is more effective than MRF for simulating the rectangular tank with inlet and outlet. RNG $k-{\epsilon}$ model strongly underestimates the velocity of experimental data and velocity by Chen & Kim's model, but it seems to be correctly predicted in overall distribution.
Keywords
Axial Flow Impeller; Radial Flow Impeller; Stirred Tank; MRF; Sliding Method; Unsteady Flow;
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