A numerical study of transient natural convection about a corrugated plate embedded in an enclosed porous medium

1995 ◽  
Vol 5 (7) ◽  
pp. 629-645 ◽  
Author(s):  
Shih‐Wen Hsiao
Keyword(s):  
Porous Medium ◽  
Natural Convection ◽  
Numerical Study ◽  
Transient Natural Convection

Natural Convection in a Cylindrical Enclosure Filled With Heat Generating Anisotropic Porous Medium

2001 ◽  
Vol 124 (1) ◽  
pp. 203-207 ◽  
Author(s):  
M. R. Dhanasekaran ◽  
Sarit Kumar Das ◽  
S. P. Venkateshan
Keyword(s):  
Porous Medium ◽  
Natural Convection ◽  
Thermal Diffusivity ◽  
Aspect Ratio ◽  
Numerical Study ◽  
Critical Value ◽  
Permeability Ratio ◽  
Anisotropic Permeability ◽  
Anisotropic Porous Medium ◽  
Diffusivity Ratio

A numerical study has been made to analyze the effects of anisotropic permeability and thermal diffusivity on natural convection in a heat generating porous medium contained in a vertical cylindrical enclosure with isothermal wall and the top and bottom perfectly insulated surfaces. The results show that the anisotropies influence the flow field and heat transfer rate significantly. The non-dimensional maximum cavity temperature increases with increase in permeability ratio. For aspect ratio greater than or equal to two, the nondimensional maximum cavity temperature increases with an increase in the thermal diffusivity ratio. For aspect ratio equal to unity, there exists a critical value of thermal diffusivity ratio at which the maximum cavity temperature is a minimum. This critical value increases with an increase in the value of anisotropic permeability ratio. Based on a parametric study correlations for maximum cavity temperature and average Nusselt number are presented.

Natural Convection in a Porous Medium Bounded by a Long Vertical WavyWall and a Parallel Flat Wall

2010 ◽  
Vol 65 (10) ◽  
pp. 800-810 ◽  
Author(s):  
Ambrish K. Tiwari ◽  
Ashok K. Singh
Keyword(s):  
Porous Medium ◽  
Nusselt Number ◽  
Natural Convection ◽  
Numerical Study ◽  
Temperature Fields ◽  
Wavy Wall ◽  
Heat Flows ◽  
Flat Wall ◽  
Porous Region ◽  
Parallel Wall

This paper presents natural convection in a porous medium bounded by a long vertical wavy wall and a parallel wall. The shape of the wavy wall is assumed to follow a profile of cosine curve. The wall is kept at a constant heat flux while the parallel wall is kept at a constant temperature. The governing systems of nonlinear partial differential equations in their non-dimensional form are linearised by using the perturbation method in terms of amplitude and the analytical solutions for velocity and temperature fields have been obtained in terms of various parameters occurring in the model. A numerical study of the analytical solution is performed with respect to the realistic fluid air in order to illustrate the interactive influences of governing parameters on the temperature and velocity fields as well as skin friction and Nusselt number. It is found that in the case of maximum waviness (positive and negative), the velocity component along the wall has a reverse trend near the flat wall. It is observed that the parallel flow through the channel at zero waviness is greater than at maximum waviness (positive and negative) while the same trend occurs for perpendicular flow in the opposite direction. Examination of the Nusselt number shows that in the presence and absence of a heat source, the heat flows from the porous region towards the walls but in the presence of a sink, the heat flows from the walls into the porous region.

scholarly journals Numerical study of transient natural convection in a cavity with multiple adiabatic blocks

PAMM ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 2100063-2100064
Author(s):  
Durga Charan Dalal ◽  
Swapan Kumar Pandit
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Transient Natural Convection
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