Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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A Study on Velocity Profiles and Critical Dean Number of Developing Transitional Unsteady Flows in a Curved Duct

곡관덕트의 입구영역에서 천이비정상유동의 속도분포와 임계딘수에 관한연구

  • 이행남 (조선대학교 공과대학 기계공학과)
  • Published : 1998.11.01
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Abstract

In this paper an experimental investigation of characteristics of developing transitional unsteady flows in a square-sectional 180。 curved duct are presented. The experimental study using air is carried out to measure axial velocity profiles secondary flow velocity profiles and entrance length by using Laser Do ppler Velocimeter(LDV) system. The flow development is found to depend upon Dean number dimensionless angular frequency velocity amplitude ration and cur-vature ratio. Of special interest is the secondary flow generated by centrifugal effects in the plane of the cross-section of the duct. The secondary flows are strong and complicate at entrance region. The entrance length of transitional pulsating flow is obtained to 120。 of bended angle of duct in this experimental conditions.

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References

  1. Proc. R. Soc. Ser. A.84-568 Flow of Water in Curved Pipes Eustice, J.
  2. Phil. Mag. S. 7 v.4 no.20 Note on the Motion of Fluid in a Curved Pipe Dean,W. R.
  3. J. Fluid Mech. v.45 Unsteady Viscos Flow in a Curved Pipe Lyne, W. H.
  4. J. Fluid Mech. v.59 Pulsating Flow in a Curved Tube Zalosh, R. G.;Nelson, W. G.
  5. J. Fluid Mech. v.98 Oscillatory Flow in Curved Pipes. Part 2. The Fully Developed case Mullin, T.;Greated, C. A.
  6. Proc. R. Soc. Ser. A. 351 Fluid Flow into a Curved Pipe Smith, F. T.
  7. J. Fluid Mech v.65 Entry flow in a Curved Pipe Singh, M. P.
  8. J. Fluid Mech v.87 Flow in the Entrance of the Aorta Singh, M.P.;Sinha, P. C.;Meena Aggarwal
  9. J. Fluid Mech v.127 Pulsatile Entrance Flow in a Curved Pipe Talbot, L.;Gong, K. O.
  10. J. Fluid Mech v.55 no.511 Turbulent Flow in a Curved duct with a Rectangulare Cross-Section (6th Report, Flow in Entrance Region in Pulsatile Flow) Kita, Y.;Korou, R.;Hirose, K.;Nakano, A.
  11. J. Fluid Mech. v.57 no.541 內頸動脈における 拍動 流推移 Naruse, T.;Nishina, Y.;Ishihara, K.;Tanishita, K.
  12. AIChE. J. v.206 no.4 Entry Region for Steady Viscous Flow in Coiled Circular Pipes Austin, L. R.;Seader, J. D.
  13. J. Fluid Mech v.61 no.587 Pulsating Flow in Curved Pipes(5th Report, Velocity Distribution in Entrance Region) Sumida, M.;Sudou, K.