Modification of square root formula for approximate estimation of diffusion coefficient of particulate adsorbents

2010 ◽  
Author(s):  
Mohammad Outokesh ◽  
Fatemeh Grayeli ◽  
Ahmad Tayyebi ◽  
Alireza Khanchi
Keyword(s):  
Diffusion Coefficient ◽  
Square Root ◽  
Approximate Estimation

scholarly journals Equations for nonlinear diffusion

2010 ◽  
Vol 51 ◽  
Author(s):  
Arvydas Juozapas Janavičius
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Equation ◽  
Analytical Solutions ◽  
Nonlinear Diffusion ◽  
Diffusion Time ◽  
Nonlinear Diffusion Equation ◽  
Square Root ◽  
Brownian Movement ◽  
Finite Velocity

The diffusion is the result of Brownian movement and occurs with a finite velocity. We presented the nonlinear diffusion equation, with diffusion coefficient directly proportional to the impurities concentration. Analytical solutions, showing that the maximum displacements of diffusing particles are proportional to the square root of diffusion time like for Brownian movement, was obtained. For small concentrations of impurities, nonlinear diffusion equation transforms to linear.

Brief-Measurements of Vapor Diffusion Coefficient

1954 ◽  
Vol 46 (11) ◽  
pp. 47-49 ◽  
Author(s):  
C.Y. Lee ◽  
C.R. Wilke
Keyword(s):  
Diffusion Coefficient ◽  
Vapor Diffusion
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