Soret and Dufour Effects in a Non-Darcy Porous Medium

2005 ◽  
Vol 128 (6) ◽  
pp. 605-610 ◽  
Author(s):  
M. K. Partha ◽  
P. V. S. N. Murthy ◽  
G. P. Raja Sekhar
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Saturated Porous Medium ◽  
Lewis Number ◽  
Solution Technique ◽  
Transfer Coefficients ◽  
Dispersion Parameters ◽  
Soret And Dufour Effects ◽  
Mass Transfer Coefficients

The effect of double dispersion on free convection heat and mass transfer from a vertical surface embedded in a non-Darcy electrically conducting fluid saturated porous medium with Soret and Dufour effects is studied using similarity solution technique. The heat and mass transfer coefficients are effected greatly due to these secondary effects and also due to the complex interaction among the dispersion parameters Raγ,Raξ, and Lewis number Le and buoyancy ratio N. In both aiding and opposing buoyancies, Df and Sr have significant influence on the Nusselt and Sherwood numbers in the presence and absence of thermal and solutal dispersion in the medium. It is also observed that the magnetic field parameter lowered heat and mass transfer coefficients. The results are presented through comparison tables and plots.

Radiation Effect on Heat and Mass Transfer by Natural Convection from a Horizontal Surface Embedded in a Porous Medium

2018 ◽  
Vol 16 ◽  
pp. 140-157 ◽  
Author(s):  
Nasreen Bano ◽  
Oluwole Daniel Makinde ◽  
B.B. Singh ◽  
Shoeb R. Sayyed
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Natural Convection ◽  
Heat And Mass Transfer ◽  
Saturated Porous Medium ◽  
Lewis Number ◽  
Similarity Solutions ◽  
Horizontal Surface ◽  
Integral Approach ◽  
Power Law Exponent

This paper deals with the study of the heat and mass transfer characteristics of natural convection from a horizontalsurface embedded in a radiating fluid saturated porous medium. Similarity solutions for buoyancy induced heat and masstransfer from a horizontal surface, where the wall temperature and concentration are a power function of distance fromthe origin, are obtained by using an integral approach of Von Karman type. The effects of the governing parameters suchas buoyancy ratio, Lewis number, radiation parameter and the power-law exponent on local Nusselt and local Sherwoodnumbers have been investigated both numerically and graphically.

scholarly journals Soret and Dufour effects on mixed convection from a vertical plate in power-law fluid saturated porous medium

2013 ◽  
Vol 40 (4) ◽  
pp. 525-542 ◽  
Author(s):  
D. Srinivasacharya ◽  
Swamy Reddy
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Differential Equations ◽  
Mixed Convection ◽  
Heat And Mass Transfer ◽  
Power Law ◽  
Vertical Plate ◽  
Saturated Porous Medium ◽  
Power Law Fluid ◽  
Soret And Dufour Effects

Mixed convection heat and mass transfer along a vertical plate embedded in a power-law fluid saturated Darcy porous medium with Soret and Dufour effects is studied. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved numerically using shooting method. The effect of Soret and Dufour parameters, power law index and mixed convection parameter on non-dimensional velocity, temperature and concentration fields are discussed. The variation of different parameters on heat and mass transfer rates is presented in tabular form.

scholarly journals Non-Darcy Mixed Convection in a Doubly Stratified Porous Medium with Soret-Dufour Effects

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
D. Srinivasacharya ◽  
O. Surender
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Mixed Convection ◽  
Heat And Mass Transfer ◽  
Vertical Plate ◽  
Saturated Porous Medium ◽  
Governing Equations ◽  
Soret And Dufour Effects ◽  
Fluid Saturated Porous Medium ◽  
Infinite Vertical Plate

This paper presents the nonsimilarity solutions for mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a doubly stratified fluid saturated porous medium in the presence of Soret and Dufour effects. The flow in the porous medium is described by employing the Darcy-Forchheimer based model. The nonlinear governing equations and their associated boundary conditions are initially cast into dimensionless forms and then solved numerically. The influence of pertinent parameters on dimensionless velocity, temperature, concentration, heat, and mass transfer in terms of the local Nusselt and Sherwood numbers is discussed and presented graphically.

Soret and Dufour Effects on Free Convection Heat and Mass Transfer From a Horizontal Flat Plate in a Darcy Porous Medium

2008 ◽  
Vol 130 (10) ◽  
Author(s):  
P. A. Lakshmi Narayana ◽  
P. V. S. N. Murthy
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Free Convection ◽  
Flat Plate ◽  
Heat And Mass Transfer ◽  
Similarity Solution ◽  
Convective Transport ◽  
Coupled Systems ◽  
Solution Technique ◽  
Soret And Dufour Effects

The effect of Soret and Dufour parameters on free convection from a horizontal flat plate in a Darcian fluid saturated porous medium is analyzed using the similarity solution technique. With constant wall temperature and concentration, the similarity solution is possible even when Soret and Dufour effects are considered in the medium. The transformed coupled systems of ordinary differential equations involve parameters such as the buoyancy ratio parameter N and diffusivity ratio Le in addition to the Soret Sr and Dufour Df parameters. The effect of all these parameters on the convective transport has been analyzed, and the variation of heat and mass transfer coefficients with Dufour and Soret parameters is presented through computer generated graphs.

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