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FLOW CHARACTERISTICS OF A TWO-DIMENSIONAL NEUTRALLY BUOYANT JET IN A MODEL SETTLING TANK

Kim, Young-han   (Department of Civil Engineering, Seoul National UniversityCC0123236  ); Seo, Il-Won   (Department of Civil Engineering, Seoul National UniversityCC0123236  ); Ahn, Jung-kyu   (Department of Civil Engineering, Seoul National UniversityCC0123236  );
  • 초록

    In this study, laboratory experiments were performed to investigate the flow characteristics of a two-dimensional neutrally buoyant jet in the inlet region of a rectangular laboratory settling tank. Velocity measurements were made with a three-component ADV. Two types of baffles were installed in front of two-dimensional slot; a one-sided and a two-sided baffle. The flow fields from a plane jet impinging on these two types of baffles and a plane jet without a baffle showed quite different characteristics. To concentrate on investigating these flow characteristics, the effects of density currents due to temperature difference or the presence of sediments were not studied. Results of the experiments reveal that the use of the two-sided baffle results in the shortest inlet region. Also shown is that, in addition to the types of baffles, the Froude number turns out to be an important factor in the extent of the inlet region.


  • 주제어

    setting tank .   two-dimensional jet .   recirculation .   baffle .   laboratory experiment.  

  • 참고문헌 (6)

    1. Anderson, N. E. (1945), 'Design of settling tanks for activated sludge,' Sewage Works Journal, Vol. 17, No. 1, pp. 50-63 
    2. Hazen, A. (1904), 'On sedimentation, Transactions,' ASCE, Vol. 53, pp. 45-71 
    3. Krebs, P., Vischer, D. and Gujer, W. (1995). 'Inlet-Structure design for final clarifiers,' Journal of Envionmental Engineering, ASCE, Vol. 121, No. 8, pp. 558-564 
    4. Krebs, P., Armbruster, M. and Rodi, W. (1998). 'Laboratory experiments of buoyancy-influenced flow in clarifiers,' Journal of Hyperaulic Research, Vol. 36, No. 5, pp. 831-851 
    5. Lyn, D. A. and Rodi, W. (1989), 'Turbulence measurement in model settling tank,' Journal of Hydraulic Engineering, ASCE Vol. 116, No. 1, pp. 3-21 
    6. Raju, K. G. R., Kothyari, U. C. and Saxena, M. (1999). 'Sediment removal efficiency of settling basins,' Journal of Irrigation and Drainage Engineering, ASCE, Vol. 125, No. 5, pp. 308-314 

 저자의 다른 논문

  • Ahn, Jung-kyu (1)

    1. 2002 "CHARACTERISTlCS OF PLANE JETS IN THE TRANSITION REGION" Water engineering research : international journal of KWRA 3 (3): 163~176    

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