Journal ArticleDOI
Heatlines visualization of convective heat flow during differential heating of porous enclosures with concave/convex side walls
Pratibha Biswal,Tanmay Basak +1 more
TLDR
In this paper, the Galerkin finite element method is used to solve the governing equations for several Prandtl numbers (Prm) and Darcy numbers (Dam) at Rayleigh number, Ram = 106, involving various wall curvatures.Abstract:
Purpose
This paper is aimed to study natural convection in enclosures with curved (concave and convex) side walls for porous media via the heatline-based heat flow visualization approach.
Design/methodology/approach
The numerical scheme involving the Galerkin finite element method is used to solve the governing equations for several Prandtl numbers (Prm) and Darcy numbers (Dam) at Rayleigh number, Ram = 106, involving various wall curvatures. Finite element method is advantageous for curved domain, as the biquadratic basis functions can be used for adaptive automated mesh generation.
Findings
Smooth end-to-end heatlines are seen at the low Dam involving all the cases. At the high Dam, the intense heatline cells are seen for the Cases 1-2 (concave) and Cases 1-3 (convex). Overall, the Case 1 (concave) offers the largest average Nusselt number (Nur¯) at the low Dam for all Prm. At the high Dam, Nur¯ for the Case 1 (concave) is the largest involving the low Prm, whereas Nur¯ is the largest for Case 1 (convex) involving the high Prm.
Practical implications
Thermal management for flow systems involving curved surfaces which are encountered in various practical applications may be complicated. The results of the current work may be useful for the material processing, thermal storage and solar heating applications
Originality/value
The heatline approach accompanied by energy flux vectors is used for the first time for the efficient heat flow visualization during natural convection involving porous media in the curved walled enclosures involving various wall curvatures.read more
Citations
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Journal ArticleDOI
Numerical analysis of natural convection heat transfer and entropy generation in a porous quadrantal cavity
TL;DR: In this article, the authors analyzed the natural convection heat transfer and irreversibility characteristics in a quadrantal porous cavity subjected to uniform temperature heating from the bottom wall, where the Brinkmann-extended Darcy model is used to simulate the momentum transfer in the porous medium.
Journal ArticleDOI
Effects of porous medium and wavy surface on heat transfer and entropy generation of Cu-water nanofluid natural convection in square cavity containing partially-heated surface
TL;DR: In this article, the authors analyzed the natural convection of nanofluid within a porous cavity containing a partially-heated vertical wall and wavy lower and upper walls and explored the effects of the Rayleigh number (Ra), Darcy number (Da), porosity (e), volume fraction of nanoparticles (φ), amplitude of wavy surface (αw), length of partially heated wall surface (LH∗), and irreversibility distribution ratio (χ) on the Bejan number (Be), total entropy generation (St), mean Nussel
Journal ArticleDOI
Analysis of Energy Flux Vector on Natural Convection Heat Transfer in Porous Wavy-Wall Square Cavity with Partially-Heated Surface
Yan-Ting Lin,Ching-Chang Cho +1 more
TL;DR: In this article, the authors used the energy-flux vector method to analyze the heat transfer characteristics of natural convection in a wavy-wall porous square cavity with a partially-heated bottom surface.
Journal ArticleDOI
Natural convection of Cu-water nanofluid in enclosed cavity with porous effect and wavy surface based on energy-flux-vector visualization method
TL;DR: In this article, the effects of a porous medium and wavy surface on natural convection of Cu-water nanofluid in an enclosed cavity based on the energy-flux vector method are examined.
Journal ArticleDOI
Numerical heat flow visualization analysis on enhanced thermal processing for various shapes of containers during thermal convection
Leo Lukose,Tanmay Basak +1 more
TL;DR: In this article, the authors studied thermal convection in nine different containers involving the same area and identical heat input at the bottom wall (isothermal/sinusoidal heating) and solved the governing equations by using the Galerkin finite element method for various processing fluids (Pr = 0.025 and 155) and Rayleigh numbers (103 ≤ ≤ 105).
References
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Book
Convection Heat Transfer
TL;DR: In this paper, the authors describe a transition from Laminar boundary layer flow to Turbulent Boundary Layer flow with change of phase Mass Transfer Convection in Porous Media.
Book
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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.