Abstract
The combined effect of waviness and porous media on the convection heat transfer and fluid flow characteristics is numerically investigated. Two models of wavy walled channel fully filled with homogenous porous material are assumed. The first was the symmetric converging-diverging channel (case A), and the second was the channel with concave-convex walls (case B). The governing equations have been solved on non-orthogonal grid, which is generated by Poisson elliptic equations, based on ADI method. Nusselt number values are used to indicate whether any cases of corrugation studied may have led to an increase in the rate of heat transferred compared with the planar surface channel which is the purpose of the study. The results show that case A gives more enhancement in heat transfer than case B. However, the thermal performance of the wavy channels (cases A & B) is better than the straight channel (simple duct).
Highlights
Heat and mass transfer through porous media is an important development and an area of very rapid growth in contemporary heat transfer researches; because of its existence in many diverse applications such as ground-water hydrology, production of oil and gas from geological structures, the gasification of coal, geothermal operations, packed-bed chemical reactors, surface catalysis of chemical reactions, filtration, adsorption, drying, compact heat exchangers and many more
Nusselt number values are used to indicate whether any cases of corrugation studied may have led to an increase in the rate of heat transferred compared with the planar surface channel which is the purpose of the study
They presented a simple correlation of the friction factor and the average Nusselt number of aluminum foams will be sought to provide a guide in practical applications
Summary
Heat and mass transfer through porous media is an important development and an area of very rapid growth in contemporary heat transfer researches; because of its existence in many diverse applications such as ground-water hydrology, production of oil and gas from geological structures, the gasification of coal, geothermal operations, packed-bed chemical reactors, surface catalysis of chemical reactions, filtration, adsorption, drying, compact heat exchangers and many more. Kim et al (2001) presented an experimental study to investigate the impact of the presence of aluminum foam on the flow and convective heat transfer in an asymmetrically heated channel They presented a simple correlation of the friction factor and the average Nusselt number of aluminum foams will be sought to provide a guide in practical applications. Kaviany (1985) developed a numerical work to investigate the fluid flow and heat transfer characteristics due to laminar flow between two isothermal parallel plates His results show that Nusselt number for fully-developed fields increases with an increase in porous media inside the channel, while the pressure drop associated with the entrance region decreases. Their results show that these effects are more pronounced in highly permeable media, high Prandtl number, large pressure gradients, and in the region close to the leading edge of the flow layer
Sign-in/Register to view highlights & summary 
Published Version (
Free)
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 call