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KSME international journal v.17 no.6, 2003년, pp.879 - 887   피인용횟수: 2

A Study of the Flow Phenomenon of Water in a Channel with Flat Plate Obstruction Geometry at the Entry

Khan, M.M.K.   (James Goldston Faculty of Engineering and Physical Systems, Central Queensland UniversityUU0015504  ); Kabir, M.A.   (James Goldston Faculty of Engineering and Physical Systems, Central Queensland UniversityUU0015504  ); Bhuiyan, M.A.   (Faculty of Civil Engineering, Bangladesh University of Engineering and TechnologyUU0015389  );
  • 초록

    The flow in a parallel walled test channel, when obstructed with a geometry at the entrance, can be forward, reverse and stagnant depending on the position of the obstruction. This interesting flow phenomenon has potential benefit in the control of energy and various flows in the process industry In this experiment, the flat plate obstruction geometry was used as an obstruction at the entry of the test channel. The parameters that influence the flow inside and around the test channel were the gap (g) between the test channel and the obstruction geometry, the length (L) of the test channel and the Reynolds number (Re). The effect of the gap to channel width ratio (g/w) on the magnitude of the velocity ratio (V $\_$ i/ / V $\_$ o/ : velocity inside/ velocity outside the test channel) was investigated for a range of Reynolds numbers. The maximum reverse flow observed was nearly 20% to 60% of the outside velocity for Reynolds number ranging from 1000 to 9000 at g/w ratio of 1.5. The maximum forward velocity inside the test channel was found 80% of the outside velocity at higher g/w ratio of 8. The effect of the test channel length on the velocity ratio was investigated for different g/w ratios and a fixed Reynolds number of 4000. The influence of the Reynolds number on the velocity ratio is also discussed and presented for different gap to width ratio (g/w). The flow visualisation photographs showing fluid motion inside and around the test channel are also presented and discussed.


  • 주제어

    Reynolds Number .   Reverse Flow .   Velocity Ratio .   Gap to Width Ratio .   Test Channel and Flat Plate Obstruction.  

  • 참고문헌 (16)

    1. Streeter, V. L., 1961, 'Handbook of Fluid Dynamics,' McGraw-Hill Co, Canada 
    2. Val Healy, J., 1992, 'Control of Turbulent Flow on a Backward Facing Step,' AIAA Paper, 92-0066 
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    4. Unal, M. F. and Rockwell, D., 1988b,' On Vortex Formation from Cylinder Part 2. Control by Splitter-Plate Interference,' J. of Fluid Mech., Vol. 190, pp. 513-292 
    5. You, J. Choi, H. and Yoo, J. Y., 2000, 'A Modified Fractional Step Method of Keeping a Constant Mass Flow Rate in Fully Developed Channel and Pipe Flows,' KSME International Journal, Vol. 14, No. 5, pp. 547-552     
    6. Park, J. S., Kim, M. S., Lee, J. S and Lee, W. I., 2002, 'A Semi-Implicit Method for the Analysis of Two-Dimensional Fluid Flow with Moving Free Surfaces,' KSME International Journal, Vol. 16, No. 5, pp. 720-731     
    7. Gerrard, J. H., 1966, 'The Mechanics of the Formation Region of Vortices Behind Bluff Bodies,' J. of Fluid. Mech., Vol. 25, pp. 401-413 
    8. Gerrard, J. H., 1978, 'The Wakes of Cylindrical Bluff Bodies at Low Reynolds Numbers,' Phil. Trans. R. Soc., London, A 288, pp. 351-382 
    9. Gowda, B. H. L., Tulapurkara, E. G. and Swain, S. K., 1993, 'Reverse Flow in Channel-Influence of Obstruction Geometry,' Experiments in Fluids, Vol. 16, pp. 137-145 
    10. Growda, B. H. L. and Tulapurkara, E. G., 1989, 'Reverse Flow in Channel with an Obstruction at the Entry,' Journal of Fluid Mech., Vol. 204, pp. 229-244 
    11. Kabir, M. A., Khan, M. M. K. and Rasul, M. A., 2002, 'Flow of Water in a Channel with Various Obstruction Geometries at the Entry,' 2nd World Engineering Congress, Sarawak, Malaysia 
    12. Abernathy, F. H. and Kronauer, R. E., 1962, 'The Formation of Vortex Streets,' J. of Fluid Mech., Vol. 13, pp. 1-20 
    13. Bearman, P. W. and Trueman, D. M., 1972, 'An Investigation of the Flow Around Rectangular Cylinders,' Aeronautical Quart, Vol. 23, pp. 229-237 
    14. Bhuiyan, M. A. Khan, M. M. K. and Kabir, M. A., 2000, 'Reverse Flow of a Non-Newtonian Fluid in a Channel,' Rheology Congress, Cambridge, U. K. Vol. -3, pp. 417-418 
    15. Davis, C. G. and Sorenson, K. E., 1969, 'Handbook of Applied Hydraulics,' McGraw- Hill Co, Canada 
    16. Eom, K., 1988, 'Performance of Butterfly Valves as a Flow Controller,' J. of Fluids Eng., Vol. 100, pp. 16-19 
  • 이 논문을 인용한 문헌 (2)

    1. 2004. "" Korea-Australia rheology journal, 16(2): 63~73     
    2. Choi, Seung ; Sohn, Chang-Hyun 2007. "Flow Analysis of Reverse Flow in a Channel with High Angle of Attack" 한국가시화정보학회지= Journal of the Korean society of visualization, 5(1): 37~42     

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