论文信息 - Time-resolved PIV investigation on the unsteadiness of a low reynolds number confined impinging jet

Time-resolved PIV investigation on the unsteadiness of a low reynolds number confined impinging jet

The flow characteristics in a confined slot jet impinging on a flat plate were investigated in low Reynolds number regime by using time-resolved Particle Image Velocimetry technique. The jet Reynolds number was varied from 404 to 1026, where it is presumed that the transient regime exists. We found that the vortical structures in the shear layer are developed with increase of Reynolds number and that the jet becomes remains steady at the Reynolds number of 404. Vortical structures and their temporal evolution are verified and the results were compared with previous numerical studies.

[1] L. Sirovich. Turbulence and the dynamics of coherent structures. I. Coherent structures , 1987 .

[2] Chih-Ming Ho,et al. Unsteady separation in a boundary layer produced by an impinging jet , 1985, Journal of Fluid Mechanics.

[3] Koji Okamoto,et al. Time-resolved proper orthogonal decomposition of the near-field flow of a round jet measured by dynamic particle image velocimetry , 2003 .

[4] Chandrakant D. Patel,et al. The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet , 2000 .

[5] Laszlo Fuchs,et al. LARGE EDDY SIMULATIONS OF A FORCED SEMICONFINED CIRCULAR IMPINGING JET , 1998 .

[6] K. Karhunen. Zur Spektraltheorie stochastischer prozesse , 1946 .

[7] E. Sparrow,et al. Impingement transfer coefficients due to initially laminar slot jets , 1975 .

[8] P. Holmes,et al. The Proper Orthogonal Decomposition in the Analysis of Turbulent Flows , 1993 .

[9] Alfonso Ortega,et al. A numerical study of the unsteady flow and heat transfer in a transitional confined slot jet impinging on an isothermal surface , 2002 .

[10] Yongmann M. Chung,et al. Numerical study of momentum and heat transfer in unsteady impinging jets , 2002 .

[11] Dominique Pelletier,et al. Characterization of a diffuser flow by time-resolved PIV , 2006, J. Vis..