Advanced SearchSearch Tips
Velocity Field Measurements of a Vertical Turbulent Buoyant Jet Using a PIV Technique
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Velocity Field Measurements of a Vertical Turbulent Buoyant Jet Using a PIV Technique
Sin, Dae-Sik; Yun, Jeong-Hwan; Lee, Sang-Jun;
  PDF(new window)
The flow characteristics of a turbulent buoyant jet were experimentally investigated using a single-frame PIV system. The Reynolds number based on the nozzle exit velocity and nozzle diameter was about Re=510. The instantaneous velocity fields in the streamwise plane passing the jet axis were measured in the near field X/D <11 with and without the temperature gradient. By ensemble averaging the instantaneous velocity fields, the spatial distributions of mean velocity, vorticity, and higher-order statistics up to third order were obtained. The temperature difference of 10 does not affect a significant influence to the flow structure in the near field, but the total entrainment rate is increased slightly. The entrainment rate shows a linear variation with the streamwise distance in the region after X/D=5.0.
Buoyant Jet;Entrainment;Velocity Field;
 Cited by
Liepmann, H. W. and Laufer, J., 1947, 'Investigation of Free Turbulent Mixing,' NACA TN 1257

Wygnanski, I. And Fieldler, H., 1969, 'Some Measurements in the Self-Preserving Jet,' J. Fluid Meeh., Vol. 38, pp. 577-612 crossref(new window)

Yule, A. J., 1978, 'Large-scale Structure in the Mixing Layer of a Round Jet,' J. Fluid Mech., Vol. 89, pp. 413-423 crossref(new window)

Liepmann, D. M., 1991, 'Streamwise Vorticity and Entrainment in the Near Field of a Round Jets,' Phys. Fluids A. 3, pp. 1179-1187 crossref(new window)

Hussein, H. J., Capp, S. P. and George, W. K., 1994, 'Velocity Measurements in a High-Reynolds-Number, Momentum-Conserving, Axisymmetric, Turbulent Jet,' J. Fluid Meeh., Vol. 258, pp. 31-75 crossref(new window)

So, R. M. C. and Aksoy, H., 1993, 'On the Vertical Turbulent Buoyant Jets,' Int. J. Heat Mass Transfer. Vol. 36, No. 13, pp. 3187-3200 crossref(new window)

Exp. in Fluids, 1998. vol.24. pp.210-224

Weisgraber, T. H. and Liepmann, D., 1998, 'Turbulent Structure during Transition to Self-Similarity in a Round Jet,' Exp. in Fluids, Vol. 24, pp. 210-224 crossref(new window)

Drobniak, S., Elsner, J. W. and EL-Kassem, E. S. A., 1998, 'The Relationship between Coherent Structures and Heat Transfer Processes in the Initial Region of a Round Jet,' Exp. in Fluids, Vol. 24, pp. 225-237 crossref(new window)

윤정환, 이상준, 2000, '레이져형광여기(LIF)를 이용한 비등온 제트유동의 온도장 측정,' 대한기계학회논문집 B 권, Vol. 24, No. 10, pp. 1399-1408

신대식, 이상준, 2000, '고해상도 CCD카메라를 이용한 Single-Frame PIV 속도장 측정기법 개발,' 대한기계학회논문집 B 권, Vol. 24, No.1, pp. 21-28

Hill, B. J., 1972, 'Measurement of Local Entrainment Rate in the Initial Region of Axisymmetric Turbulent Air Jets,' J. Fluid Mech., Vol. 51, Part 4, pp. 773-779 crossref(new window)