DOI QR코드

DOI QR Code

An Experimental Study on Flow Characteristics of Turbulent Pulsating Flow in a Curved Duct by Using LDV

LDV에 의한 곡관덕트에서 난류맥동유동의 유동특성에 관한 실험적 연구

  • Published : 2001.11.01

Abstract

In the present study, flow characteristics of turbulent pulsating flow in a square-sectional 180$^{\circ}$curved duct were experimentally investigated. The experimental study for air flows in a curved duct are carried out to measure axial velocity profiles, wall shear stress distributions and entrance length in a square-sectional 180$^{\circ}$curved duct by using the Laser Doppler Velocimeter(LDV) system and the data acquisition. Velocity profiles are obtained using the Rotating Machinery Resolver(RMR)and PHASE software in case of turbulent pulsating flow. Finally, it was plotted by the ORIGIN software. The experiment was conducted in seven sections from the inlet (ø = 0$^{\circ}$) to the outlet (ø=l80$^{\circ}$) at 3 0$^{\circ}$intervals of the duct.

Keywords

Turbulent Pulsating Flow;Axial Velocity Distributions;Wall Shear Stress Distributions;Entrance Length

References

  1. Bong, T. G., 1996, ' A Study on the Flow Characteristics of Developing Transitional Steady, Transitional Oscillatory and Transitional Pulsating Flows in a Entrance Region of a Curved Duct,' Ph.D Thesis., Chosun Univ.
  2. Singh, M. P., 1974, ' Entry Flow in a Curved Pipe,' J. Fluid Mech, Vol. 65, part. 3, pp. 517-539 https://doi.org/10.1017/S0022112074001522
  3. Naruse, T., et aI., 1991, ' A Study on a View Pulsating Flow in a Cerebral Arterial,' Journal of JSME(B), Vol. 57, No. 541, pp. 3018-3025
  4. Sumida, M., and Sudou, K., 1995, ' Pulsating Flow in Curved Pipes : The 5th Report, Velocity Distribution in Entrance Region,' Journal of JSME(B), Vol. 61, No. 587, pp. 2442-2449
  5. Son, et al., 1998, ' Critical Dean number, Secondary flow and Wall shear stress Distributions of the Transitional Pulsating Flows in a Curved Duct,' KSME-JSME Fluid Engineering Conference, pp. 521-524
  6. Son, H. C., 2000, ' A Study on the Flow Characteristics of Developing Turbulent Steady, Turbulent Oscillatory and Turbulent Pulsating Flows in the Entrance Region of a Curved Due t,' Ph.D Thesis., Chosun Univ.
  7. Smith, F. T., 1976, ' Fluid Flow into a Curved Pipe,' Proc. R., Soc. Ser. A., Vol. 351, pp. 71-87 https://doi.org/10.1098/rspa.1976.0130
  8. 서상호, 유상신, 김형호, 노형운, 1996, '분기관내 뉴톤 유체와 혈액의 맥동유동 특성에 관한 연구,' 대한기계학회논문집, 제20권, 제11호, pp. 3607-3619
  9. 김병석, 신세현, 손창현, 1997, '직사각 덕트에서 전달율에 의존적인 열전도율을 갖는 비뉴턴 유체의 열전달 향상에 관한 수치적 연구,' 대한기계학회논문집, 제21권, 제6호, pp. 773-778
  10. 신종근, 최영돈, 1996, '저레이놀즈수 2차 모멘트 난류모형에 의한 정사각 단면의 $180^{\circ}$ 곡덕트 난류유동의 수치해석,' 대한기계학회논문집, 제20권, 제8호, pp. 2650-2669
  11. 박길문, 조병기, 봉태근, 1998, '정사각단면 $180^{\circ}C$ 곡관덕트에서 층류진동유동의 유동 특성에 관한 연구,' 대한기계학회논문집, 제22권, 제2호, pp. 139-152
  12. 서상호, 유상신, 장남일, 1996, '비뉴턴 유체의 협학관내 압력손실 계수에 관한 연구,' 대한기계학회논문집, 제20권, 제5호, pp. 1603-1612
  13. 이상배, 권기린, 장태현, 1997, '균일 열플럭스가 있는 $180^{\circ}C$ 원형단면 곡관의 선회유동 열전달 특성 연구,' 대한기계학회논문집, 제21권, 제5호, pp. 616-627