DETERMINATION METHOD OF VARIABLE DIFFUSION COEFFICIENTS OF HYGROSCOPIC MATERIAL FROM DRYING RATE CURVES OF THE SINGLE PARTICLE

1992 ◽  
Vol 10 (3) ◽  
pp. 733-752 ◽  
Author(s):  
M. Legros ◽  
M. Yoshida ◽  
T. Sakaguchi ◽  
H. Imakoma ◽  
M. Okazaki
Keyword(s):  
Single Particle ◽  
Diffusion Coefficients ◽  
Drying Rate ◽  
Determination Method ◽  
Variable Diffusion ◽  
Hygroscopic Material ◽  
Variable Diffusion Coefficients

Soret Effect for a Ternary Mixture in Porous Cavity: Modeling With Variable Diffusion Coefficients and Viscosity

2008 ◽  
Vol 130 (8) ◽  
Author(s):  
T. J. Jaber ◽  
Y. Yan ◽  
M. Z. Saghir
Keyword(s):  
Thermal Diffusion ◽  
Diffusion Coefficients ◽  
Molecular Diffusion ◽  
Soret Effect ◽  
Left Wall ◽  
Porous Cavity ◽  
Buoyancy Convection ◽  
Variable Diffusion ◽  
Variable Diffusion Coefficients ◽  
The Right

A porous cavity filled with methane (C1), n-butane (nC4), and dodecane (C12) at a pressure of 35.0MPa is used to investigate numerically the flow interaction due to the presence of thermodiffusion and buoyancy forces. A lateral heating condition is applied with the left wall maintained at 10°C and the right wall at 50°C. The molecular diffusion and thermal diffusion coefficients are functions of temperature, concentration, and viscosity of mixture components. It has been found that for permeability below 200md the thermodiffusion is dominant; and above this level, buoyancy convection becomes the dominant mechanism. The variation of viscosity plays an important role on the molecular and thermal diffusion.

scholarly journals ERROR ESTIMATES FOR A CLASS OF FINITE DIFFERENCE-QUADRATURE SCHEMES FOR FULLY NONLINEAR DEGENERATE PARABOLIC INTEGRO-PDES

2008 ◽  
Vol 05 (01) ◽  
pp. 187-219 ◽  
Author(s):  
IMRAN H. BISWAS ◽  
ESPEN R. JAKOBSEN ◽  
KENNETH H. KARLSEN
Keyword(s):  
Finite Difference ◽  
Error Estimates ◽  
Viscosity Solutions ◽  
Diffusion Coefficients ◽  
Jump Diffusion ◽  
Bellman Equations ◽  
Variable Diffusion ◽  
Degenerate Parabolic ◽  
Variable Diffusion Coefficients ◽  
Nonlinear Degenerate

Error estimates are derived for a class of finite difference-quadrature schemes approximating viscosity solutions of nonlinear degenerate parabolic integro-PDEs with variable diffusion coefficients. The relevant equations can be viewed as Bellman equations associated to a class of controlled jump-diffusion (Lévy) processes. The results cover both finite and infinite activity cases.

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