Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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CFD ANALYSIS ON THE CHARACTERISTICS FOR FLOCCULATORS OF VERTICAL PADDLE AND HYDRO-FOIL TYPE

수직 패들형 및 하이드로 포일형 응집기 특성의 전산유체역학 해석

  • Shin, J.H. (Department of Mechanical Engineering, Kunsan National University) ;
  • Chang, S.M. (School of Mechanical, Automotive, Naval Architecture, and Ocean Eng., Kunsan National University) ;
  • Cho, Y. (K-Water Institute, Korea Water Resources Corporation)
  • 신종현 (군산대학교 일반대학원 기계공학과) ;
  • 장세명 (군산대학교 기계자동차조선해양공학부) ;
  • 조용 (한국수자원공사 K-water연구원)
  • Received : 2016.03.31
  • Accepted : 2016.08.05
  • Published : 2016.09.30
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Abstract

In the water purification plant, the mixture of water and chemical from the mixing basin enters the flocculation basin. The rotating flocculators are generally used for the efficient flocculation of dregs. In this paper, the performance of flocculators of a vertical paddle type, widely used in the typical flocculation basins, and a hydro-foil type, recently disseminated in the field, are compared with each other by use of the numerical method. Also the characteristics and the efficiency are analyzed with CFD techniques. The strain rate and the eddy viscosity are compared for two types to predict the mixing efficiency, and the maximum speed and its location are pursued from the computed data. The hydrofoil type shows that the eddy viscosity is enhanced 1.66 to 3.03 times larger than that of vertical paddle type, and also produced 1.87 to 1.95 times larger flocs for each stage. However, the rapid rotation of hydrofoil may chop the floc to small size due to the higher turbulence intensity. From the result of computation, the strong and weak points of each type have been analyzed for the decision making.

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