Turbulent Mixed Convection Flow Over a Backward-Facing Step-The Effect of Step Heights
Effect of the backward-facing step heights on turbulent mixed convection flow along a vertical flat plate is examined experimentally. The step geometry consists of an adiabatic backward-facing step, an upstream wall and a downstream wall. Both the upstream and downstream walls are heated to a uniform and constant temperature. Laser-Doppler velocimeter and cold wire anemometer were used, respectively, to measure simultaneously the time-mean velocity and temperature distributions and their turbulent fluctuations. The experiment was carried out for step heights of 0, 11, and 22 mm, at a free stream air velocity, u∞, of 0.41 m/s, and a temperature difference, ΔT, of 30 °C between the heated walls and the free stream air. The present results reveal that the turbulence intensity of the streamwise and transverse velocity fluctuations and the intensity of temperature fluctuations downstream of the step increase as the step height increases. Also, it was found that both the reattachment length and the heat transfer rate from the downstream heated wall increase with increasing step height.
H. I. Abu-Mulaweh et al., "Turbulent Mixed Convection Flow Over a Backward-Facing Step-The Effect of Step Heights," International Journal of Heat and Fluid Flow, Elsevier, Dec 2002.
The definitive version is available at http://dx.doi.org/10.1016/S0142-727X(02)00191-1
Mechanical and Aerospace Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Backward-Facing Step Heights; Turbulent Mixed Convection Flow; Vertical Flat Plate
Article - Journal
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