Journal ArticleDOI
Effects of boundary conditions on non-Darcian heat transfer through porous media and experimental comparisons
TLDR
In this article, a numerical simulation of forced convective incompressible flow through porous beds was performed in terms of non-dimensional parameters that successfully cast together all the pertinent influencing effects.Abstract:
The present work centers around the numerical simulation of forced convective incompressible flow through porous beds. Inertial as well as viscous effects are considered in the momentum equation. The mathematical model for energy transport was based on the two-phase equation model, which does not employ local thermal equilibrium assumption between the fluid and the solid phases. The transport processes for two different types of boundary conditions are studied. The analysis was performed in terms of nondimensional parameters that successfully cast together all the pertinent influencing effects. Comparisons were made between our numerical findings and experimental results. Overall, the comparisons that were made for the constant wall heat flux boundary condition display good agreement.read more
Citations
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Journal ArticleDOI
Analytical characterization and conceptual assessment of solid and fluid temperature differentials in porous media
Dae-Young Lee,Kambiz Vafai +1 more
TL;DR: In this paper, an analytical characterization of forced convective flow through a channel filled with a porous medium is presented based on a two-equation model, including transverse conduction contributions, exact solutions are obtained for both fluid and solid phase temperature fields.
Journal ArticleDOI
A synthesis of fluid and thermal transport models for metal foam heat exchangers
Shadi Mahjoob,Kambiz Vafai +1 more
TL;DR: In this article, the effects of micro structural metal foam properties, such as porosity, pore and fiber diameters, tortuosity and pore density, on the heat exchanger performance are discussed.
Journal ArticleDOI
Constant wall heat flux boundary conditions in porous media under local thermal non-equilibrium conditions
Bader Alazmi,Kambiz Vafai +1 more
TL;DR: In this paper, boundary conditions for constant wall heat flux in the absence of local thermal equilibrium conditions are analyzed and the effects of variable porosity and thermal dispersion are also analyzed.
Journal ArticleDOI
Non-Darcy natural convection in high porosity metal foams
TL;DR: In this paper, the authors present numerical and experimental results for buoyancy-induced flows in high porosity metal foams heated from below using a Brinkman-Forchheimer-extended Darcy flow model and a semi-heuristic two-equation energy model obtained by relaxing the local thermal equilibrium assumption.
Journal ArticleDOI
Analysis of Variants Within the Porous Media Transport Models
Bader Alazmi,Kambiz Vafai +1 more
TL;DR: In this paper, the effects of the Darcy number, inertia parameter, Reynolds number, porosity, particle diameter, and the fluid-to-solid conductivity ratio on the variances within each of the four areas are analyzed.
References
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Book
Porous Media: Fluid Transport and Pore Structure
TL;DR: In this paper, the authors examined the relationship between transport properties and pore structure of porous material and presented models of pore structures with a discussion of how such models can be used to predict the transport properties of porous media.
Journal ArticleDOI
Boundary and inertia effects on flow and heat transfer in porous media
Kambiz Vafai,Chuen-Lin Tien +1 more
TL;DR: In this article, the effects of a solid boundary and the inertial forces on flow and heat transfer in porous media were analyzed, and a new concept of the momentum boundary layer central to the numerical routine was presented.
Journal ArticleDOI
Effect of fluid dispersion coefficients on particle-to-fluid mass transfer coefficients in packed beds. correlation of sherwood numbers
N. Wakao,T. Funazkri +1 more
TL;DR: In this article, the published heat transfer data obtained from steady and nonsteady measurements are corrected for the axial fluid thermal dispersion coefficient values proposed by Wakao and Funazkri.
Journal ArticleDOI
Effect of fluid dispersion coefficients on particle-to-fluid heat transfer coefficients in packed beds
N. Wakao,S. Kaguei,T. Funazkri +2 more
Journal ArticleDOI
Heat and mass transfer in packed beds
Donald A. Plautz,H. F. Johnstone +1 more
TL;DR: In this article, mass diffusivities, effective thermal conductivities, and wall heat transfer coefficients were measured in an 8-in. tube packed with 1/2-and 3/4in. glass spheres.
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Analysis of dispersion effects and non-thermal equilibrium, non-Darcian, variable porosity incompressible flow through porous media
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