Abstract
In the current study, a numerical investigation of three-dimensional combined convection-radiation heat transfer over an inclined forward facing step (FFS) in a horizontal rectangular duct is presented. The fluid is treated as a gray, absorbing, emitting and scattering medium. To simulate the incline surface of FFS, the blocked-off method is employed in this study. The set of governing equations for gas flow are solved numerically using the CFD technique to obtain the temperature and velocity fields. Since the gas is considered as a radiating medium, all of the convection, conduction and radiation heat transfer mechanisms are presented in the energy equation. For computation of radiative term in energy equation, the radiative transfer equation (RTE) is solved numerically by the discrete ordinates method (DOM) to find the divergence of radiative heat flux distribution inside the radiating medium. The effects of optical thickness, radiation-conduction parameter and albedo coefficient on heat transfer behavior of the system are carried out.
Highlights
Forced convection flow over a backward or forward facing step in a three-dimensional channel is widely encountered in engineering applications
Numerical results are presented for combined convection and radiation heat transfer over an inclined forward facing step (FFS) in a three -dimensional duct with a contraction ratio of CR = 0.5 and aspect ratio of AR = 4 at different conditions
Simulation of combined convection and radiation heat transfer over an inclined forward facing step (FFS) in a rectangular duct with constant step inclination angle in a 3-D horizontal duct is studied in this research work
Summary
Forced convection flow over a backward or forward facing step in a three-dimensional channel is widely encountered in engineering applications These geometries are important in industrial studies. In a numerical research work by Nie and Armaly [8], distributions of wall temperature, Nusselt number and friction coefficient on all of the bounding walls of laminar three-dimensional forced convection flow adjacent to backward-facing step in a rectangular duct were reported. There are many research studies about BFS geometries, the fluid flow with heat transfer over forward facing step (FFS) received less attention in comparison to the convection flow over BFS. Bahrami and Gandjalikhan Nassab [12] analyzed the convection flow over forward facing step in a duct to investigate the amount of entropy generation in this type of flow. At different points of view, this geometry (FFS) was studied by several researchers [14] [15]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electronics Cooling and Thermal Control
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
