scholarly journals EFFECT OF THE VARIABILITY OF HEAT AND MASS TRANSFER COEFFICIENTS ON 3D UNSATURATED POROUS MEDIUM DRYING

2018 ◽  
Vol 10 ◽  
Author(s):  
Nidhal Ben Khedher
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Unsaturated Porous Medium

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.

Numerical Simulation of Heat and Mass Transfer Enhancement in Absorption Process With Double-Side Film-Inversion

2008 ◽  
Author(s):  
Ya-Ping Chen ◽  
Chen-Jie Shi ◽  
Ming-Heng Shi ◽  
Chen-Min Ling
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Vertical Plane ◽  
Mathematic Model ◽  
Absorption Process ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Plane Plate ◽  
Before And After ◽  
Calculation Results

Film-inversion is an effective way recently developed to enhance heat and mass transfer in absorbers. However, only one-side of round or rectangular tube i.e. half of the total heat transfer area is used to form film-inverting configuration in the published literature. The paper presents a double-side film-inverting scheme, which consists of two plate bundles and a set of comb shaped conjunction guiders between them for leading solution film from both-sides of each couple of the upper plate bundle to the opposite sides of the bottom ones. A two-scale crosswise corrugation plate bundle, which has vertical large corrugations and horizontal small ones, is suggested instead of the plane plate bundle. The horizontal small corrugation can make the film turbulent and film distribution uniform before and after inversion with surface tension effect, thus increasing the heat and mass transfer coefficients of the absorption process. A mathematic model for heat and mass transfer in absorption process with aqueous Li-Br solution falling film-inverting on two sequential vertical plane plates was established and solved numerically. The distributions of dimensionless velocity, temperature and concentration of liquid film profile before and after film-inverting were obtained. The influence of the number of inversion on heat and mass transfer characteristics was analyzed. The calculation results show that the heat and mass transfer coefficients of the once-film-inverting scheme have about 58% and 73% increment respectively over these of the none film-inverting scheme.

scholarly journals Experimental study of heat and mass transfer coefficients at heat recovery of steam-gas flow in the torch of drops of mechanical nozzle

2015 ◽  
Vol 6 (8(78)) ◽  
pp. 50
Author(s):  
Артур Юрьевич Рачинский ◽  
Михаил Константинович Безродный ◽  
Николай Никифорович Голияд ◽  
Петр Алексеевич Барабаш
Keyword(s):  
Mass Transfer ◽  
Experimental Study ◽  
Heat And Mass Transfer ◽  
Heat Recovery ◽  
Gas Flow ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients
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