• Title/Summary/Keyword: 반경방향유동 임펠라

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Numerical Study on Flow Patterns of Impeller's Type in a Stirred Tank (혼합탱크 내의 임펠라 형태에 따른 유동 특성에 관한 수칙해석)

  • Oh, Sueg-Young;Song, Gil-Sub
    • 유체기계공업학회:학술대회논문집
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    • 2001.11a
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    • pp.454-459
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    • 2001
  • The present study is concerned with the flow patterns induced by other impellers in a rectangular tank Impellers are FBT(Flat blade turbine), PBT(Pitched blade turbine), Shroud turbine, Rushton Turbine, and Helical ribbon turbine. The solution of flows in moving reference frames requires the use of 'moving' cell zone. The moving zone approaches are MRF(Multiple reference frame), which is a steady-state approximation and Sliding method, which is a unsteady-state approximation. Numerical results using two moving zone approaches are 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 is RNG k-$\epsilon$ model.

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Numerical Study on Flow Patterns in a Stirred Tank with Impeller Types (혼합탱크 내의 임펠라 형태에 따른 유동 특성에 관한 수치해석)

  • Song, Gil-Sub;Oh, Sueg-Young;Oh, Jeong-Jin
    • The KSFM Journal of Fluid Machinery
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    • v.5 no.2 s.15
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    • pp.29-35
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    • 2002
  • 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.