Title
Three-Dimensional Convection Flow Adjacent to Inclined Backward-Facing Step
Document Type
Article
Publication Date
12-2006
Publication Title
International Journal of Heat and Mass Transfer
Volume
49
Issue
25-26
First page number:
4795
Last page number:
4803
Abstract
Simulations of three-dimensional laminar forced convection adjacent to inclined backward-facing step in rectangular duct are presented to examine effects of step inclination on flow and heat transfer distributions. The step height is maintained as constant while its inclination angle is changed from 15° to 90°. The inlet flow is hydrodynamically steady and fully developed with uniform temperature. The bottom wall is heated with constant heat flux, while other walls are maintained as being thermally adiabatic. Velocity, temperature, Nusselt number, and friction coefficient distributions are presented. The “jet-like” flow and its impingement do not appear as the inclination angle of backward-facing step is small (α = 15°). At the center width of the duct and close to the stepped wall, the location where the streamwise velocity component is zero changes from a saddle point to a nodal point as the step inclination angle decreases. The downwash adjacent to the sidewall becomes stronger as the step inclination angle increases. The maximum Nusselt number on the stepped wall is located near the sidewall for α ⩾ 30° and it appears near the center width of duct for small step inclination angle (α = 15°). The friction coefficient inside the primary recirculation region increases with the increase of the step inclination angle. Downstream of the primary recirculation region, increase of the friction coefficient becomes slower as the step inclination angle increases.
Keywords
Heat – Convection; Heat – Transmission; Laminar flow
Disciplines
Fluid Dynamics | Heat Transfer, Combustion | Mechanical Engineering
Language
English
Permissions
Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.
Repository Citation
Chen, Y.,
Nie, J. H.,
Hsieh, H.,
Sun, L. J.
(2006).
Three-Dimensional Convection Flow Adjacent to Inclined Backward-Facing Step.
International Journal of Heat and Mass Transfer, 49(25-26),
4795-4803.