Turbulent Mixed Convection Flow over a Vertical Backward-Facing Step
Abstract
Turbulent mixed convection adjacent to a two dimensional, vertical backward-facing step is predicted numerically to explore the effect of step height on turbulent mixed convection using a two-equation k-ε turbulence model. Computations are performed for air with a Prandtl number of 0.71 for different step heights ranging from 11 mm to 44 mm, and at a temperature difference of 30°C between the heated upstream and downstream plates and the free stream. The effects of different step heights on the reattachment length, the local Nusselt number, the mean velocity and temperature distributions, the turbulent kinetic energy and its dissipation rate are examined. The computational results reveal that for small expansion ratios, the step height effect is small on the upstream flow, but it has a strong impact on the turbulent flow characteristics and heat transfer rate downstream from the step.
Recommended Citation
J. Z. Zhao et al., "Turbulent Mixed Convection Flow over a Vertical Backward-Facing Step," American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, vol. 357, no. 2, pp. 185 - 191, Dec 1998.
Department(s)
Mechanical and Aerospace Engineering
International Standard Serial Number (ISSN)
0272-5673
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 The Authors, All rights reserved.
Publication Date
01 Dec 1998