Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
권호 표지

A Study on Characteristics of Unsteady Laminar Flows in Squaresectional $180^{\circ}$ Curved Duct

정사각단면 $180^{\circ}$ 곡관덕트의 입구영역에서 비정상층류유동의 유동특성에 관한 연구

  • Park, G.M. (Dept. of Mechanical Eng, Chosun Univ.) ;
  • Mo, Y.W. (Dept. of Mechanical Eng, Chosun Univ.) ;
  • Cho, B.K. (Dept. of Mechanical Design, Chosun Univ. Tech. Junior College)
  • Published : 1996.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

The flow characteristics of developing unsteady laminar flow in a square-sectional $180^{\circ}$ curved duct are experimentally investigated by using laser doppler velocimerty (LDV) system with data acquisition and processing system of rotating machinery resolver(RMR) and PHASE software. The major flow characteristics of developing laminar pulsating flows are presented by mean velocity profilel velocity distribution of secondary flow, wall shear stress distributions, entrance lengths according to dimensionless angular frequency($\omega^+$), velocity amplitude ratio($A^1$), and time-averaged Dean number($De_ta$). The velocity profiles and wall shear stress distribution of laminar pulsating flow with dimensionlessangular frequency show the flow characteristics of the quasi-steady laminar flow in a curved duct. The developing region of laminar pulsatile flows in a square-sectional $180^{\circ}$ curved duct is extended to the curved duct angle of approximately $120^{\circ}$ under the present experimental condition.

Keywords

References

  1. +Pulsatile Blood Flow E. O. Attinger
  2. The Fluid Mechanics of Large Blood Vessels T. J. Pedley
  3. Bul. of the JSME v.27 no.234 Pulsating Flow in Curved Pipes(2nd Report, Experiments) M. Sumida;K. Sudou;T. Takami
  4. 日本油壓と空氣壓 學會論文集 Research on Unsteady Flow in a Tube(The 1st Report, On Velocity Profile of Unsteady Flow) K. Nakano;J. Tanino
  5. 日本機械學會論文集(B編) v.50 no.452 曲り圓管內 層流助走區間流れに關する硏究 (第一報. 入口速度分布による發達 の相違 M. Akiyama;S. Takamura;K. C. Cheng;M. Suzuki;I. Nishiwaki
  6. Mem. Fac. Eng. Hiroshima Univ. v.9 no.3 Some Observation on Oscillatory Water Flow in a Straight Pipe K. Sudou;T. Takami;Miyauchi
  7. Phill Mag v.4 Note on the Motion of Fluid in Curved Pipes W. R. Dean
  8. J. Fluid Mech. v.45 Unsteady Viscous Flow in a Curved Pipe W. H. Lyne
  9. J. Fluid Mech. v.59 Pulsating Flow in Curved Tube R. G. Zalosh;W. G. Nelson
  10. Bulletin of the JSME v.24 no.187 Flow pattern and Frictional Losses in Pulsating Pipe Flow M. Ohmi;M. Iguchi
  11. J. Fluid Mech v.70 An Experimental Investigation of low Reynolds Number Secondary Streaming Effects Associated with an Oscillating Viscous Flow in a Curved Pipe A. F. Bertelsen
  12. J. Fluid Mech v.111 Experimental Study of Physiological Pulsatile Flow in a Curved Tube K. B. Chandran;T. L. Yearwood
  13. J. Fluid Mech v.161 Numerical Simulation of Fully Developed Sinusoidal and Pulsatile Flow in Curved Tubes L. J. Chang;J. M. Tarbell
  14. J. Fluid Engineering Fully Developed Laminar Flow in Curved Rectangular Channels K. C. Cheng;Lin, Ran-Chau;Ou, Jenn-Wuu
  15. Q. J. Mech. Appl. Math v.28 no.1 The Steady Motion of Viscous Fluid in a Curved Tube W. M. Collins;S. C. R. Dennis
  16. 日本機械學會論文集(B編) v.55 no.511 Turbulent Flow in a Curved Duct with a Rectangular Cross-Section (6th Report, Flow in Entrance Region in Pulsatile Flow) Y. Kita;R. Korou;K. Hirose;A. Nakano
  17. Journal of Fluids Engineering Laminar Incompressible Viscous Flow in Curved Ducts of Regular Cross-Sections K. N. Ghia;J. S. Sokhey
  18. J. Applid Mech Measurement of Laminar Flow Development in a Square Duct Using a Laser-Doppler Flowmeter R. J. Goldstein;D. K. Kreid