Results 161 to 170 of about 3,974 (207)

Heart-Lung Interactions in Gas Exchange: From Physiology to Pathophysiology. [PDF]

Compr Physiol
Miserocchi G, Beretta E.
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Knudsen diffusion differs from Fickian diffusion

Physics of Fluids, 2021
We investigate the gas transport enhancement through nanotubes, relative to the prediction by the prevailing century-old Knudsen diffusion model. This enhancement is usually attributed to the partly specular molecular reflections at the smooth nanotube surface, which break the model assumption of completely diffusive reflections.
Zhihui Li, , Chunpei Cai
exaly   +2 more sources

Diffusion in a mesoporous silica membrane: Validity of the Knudsen diffusion model

Chemical Engineering Science, 2009
Experimental permeance data for several light gases in a mesoporous silica membrane are analyzed in detail and shown to conform closely to the Knudsen diffusion model. The results of this study do not support the conclusions drawn from recent molecular simulations concerning the inadequacy of the Knudsen model.
Douglas Ruthven
exaly   +2 more sources

Numerical simulation of Knudsen diffusion in metallic foam

Computational Materials Science, 2011
Abstract This paper addresses diffusion of air within a cellular metal. A Knudsen diffusion simulation is performed on both simplified model structures and, for the first time, computed tomography data of real materials. In the first part, the three deflection models (mirror reflection, random deflection and random cosine deflection) are compared. It
Thomas Fiedler, G E Murch, I V Belova
exaly   +2 more sources

Knudsen self- and Fickian diffusion in rough nanoporous media

Journal of Chemical Physics, 2003
The effect of pore surface roughness on Knudsen diffusion in nanoporous media is investigated by dynamic Monte Carlo simulations and analytical calculations. A conceptual difference is found between the roughness dependence of the macroscopic, transport diffusivity and the microscopic, self-diffusivity, which is reminiscent of diffusion in zeolites ...
Marc-Olivier Coppens, Malek Kourosh, Coppens Marc-Olivier   +2 more
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KNUDSEN DIFFUSION

Soil Science, 1986
The analytical principles and applications of the theory of Knudsen diffusion are reviewed, with emphasis on gas transport in the soils of planetary bodies. Knudsen diffusion occurs when the mean free path of diffusing gas molecules surpasses the size of the pores through which diffusion proceeds.
STEPHEN M. CLIFFORD, DANIEL HILLEL
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Knudsen diffusion in channels and networks

Chemical Engineering Science, 2014
Abstract Knudsen diffusion is approximately valid when the channel diameters are much larger than molecular diameters, adsorption forces are weak or negligible, and the only obstacles are molecule–wall collisions. The ray lengths between walls are distributed over an enormous range, and there is no upper bound for occasional extreme outliers .
Jichang Liu, James Wei
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Statistical method for modeling Knudsen diffusion in nanopores

Physical Review E, 2019
This paper presents a statistical method for the calculation of gaseous flux and diffusion coefficients through a Knudsen-regime cylindrical nanopore. A general integral formula for the flux is derived in terms of collision frequency, molecular density, and a scattering path length probability distribution.
Fenner Colson, D. A. Barlow
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Surface roughness effects on Knudsen diffusion

Chemical Engineering Science, 1989
Influence de la structure des pores (tortuosite, aire superficielle) sur la diffusivite ...
Terry E. Holt, Douglas M. Smith
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Knudsen layer for tracer gas diffusion

The Physics of Fluids, 1975
The diffusion of a tracer gas from a plane, porous boundary into a steady, rarefied background is investigated using the BGK model to account for collisions between the tracer and the background molecules. In a limited region close to the central part of the wall the diffusion process is nearly one-dimensional, and the resulting kinetic diffusion ...
Ytrehus, T., Smolderen, J. J., Wendt, J. F.   +2 more
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