Modeling of gas transport in porous medium: Stochastic simulation of the Knudsen gas and a kinetic model with homogeneous scatterer

2020 ◽  
Vol 32 (10) ◽  
pp. 102004
Author(s):  
Shigeru Takata ◽  
Kisho Hatakenaka ◽  
Masanari Hattori ◽  
Fumiyoshi Kasahara
Keyword(s):  
Porous Medium ◽  
Kinetic Model ◽  
Stochastic Simulation ◽  
Gas Transport ◽  
Knudsen Gas

Evolution of gas transport pattern with the variation of coal particle size: Kinetic model and experiments

2020 ◽  
Vol 367 ◽  
pp. 336-346 ◽  
Author(s):  
Wei Zhao ◽  
Kai Wang ◽  
Yuanping Cheng ◽  
Shimin Liu ◽  
Long Fan
Keyword(s):  
Particle Size ◽  
Kinetic Model ◽  
Coal Particle ◽  
Gas Transport

Viscous and Knudsen gas flow through dry porous cometary analogue material

2021 ◽  
Author(s):  
M Schweighart ◽  
W Macher ◽  
G Kargl ◽  
B Gundlach ◽  
H L Capelo
Keyword(s):  
Diffusion Coefficient ◽  
Gas Flow ◽  
Gas Transport ◽  
Gas Permeability ◽  
Knudsen Diffusion ◽  
Flow Measurements ◽  
Knudsen Flow ◽  
Internal Sources ◽  
Trapped Gas ◽  
Knudsen Gas

Abstract According to current theories of the formation of stellar systems, comets belong to the oldest and most pristine class of bodies to be found around a star. When approaching the Sun, the nucleus shows increasing activity and a pressure increase inside the material causes sublimated and trapped gas molecules to stream away from their regions of origin towards the surface. The present work studies two essential mechanisms of gas transport through a porous layer, namely the Darcy and the Knudsen flow. Gas flow measurements are performed in the laboratory with several analogue materials, which are mimicking dry cometary surface properties. In this first series of measurements, the aim was to separate gas transport properties from internal sources like local sublimation or release of trapped gases. Therefore, only dry granular materials were used and maintaining a low temperature environment was unnecessary. The gas permeability and the Knudsen diffusion coefficient of the sample materials are obtained, thereby representing the relative importance of the respective flow mechanism. The experiments performed with air at a stable room temperature show that the grain size distribution and the packing density of the sample play a major role for the permeability of the sample. The larger the grains, the bigger the permeability and the Knudsen diffusion coefficient. From the latter we estimated effective pore diameters. Finally, we explain how these parameters can be adapted to obtain the gas flow properties of the investigated analogue materials under the conditions to be expected on the comet.

In-Situ Upgrading In a Dolomite Porous Medium: A Kinetic Model Comparison and Nanocatalyst Deposition Study

2021 ◽  
pp. 108799
Author(s):  
J. Duran Armas ◽  
A. Garcia-Vila ◽  
Lante Carbognani Ortega ◽  
Carlos E. Scott ◽  
Brij Maini ◽  
...  
Keyword(s):  
Porous Medium ◽  
Kinetic Model ◽  
Model Comparison

A kinetic model for the combustion of carbon in a porous medium

1993 ◽  
Vol 29 (3) ◽  
pp. 382-384
Author(s):  
E. M. Tonkopii ◽  
G. B. Manelis ◽  
S. V. Kulikov
Keyword(s):  
Porous Medium ◽  
Kinetic Model
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