The prediction and calculation of the gas diffusion coefficient in a coal matrix is a key scientific issue in the study of gas diffusion behavior in coal. Due to its inherent shortcomings, the diffusion coefficient obtained from analytical models and widely used in academia does not fully reflect...
The gas diffusion coefficient in soil (DP), and its dependency on soil physical characteristics, governs the diffusive transport of oxygen, greenhouse gases, fumigants, and volatile organic pollutants in agricultural, forest, and urban soils. Accurate models for predicting DP as a function of air-...
where depletion or accumulation of gas molecule (δC/δt, mol cm–3 s–1) is proportional to the effective diffusion coefficient (Ds, cm2 s–1), the second derivative of the concentration gradient along a distance (δ2C/δx2, mol cm–5), the consumption rate (u, mol cm–2 s–1...
A widely applicable Bosanquet-type empirical relation at the Darcy scale is found between the normalized effective gas diffusion coefficient and the average Knudsen number. The present work will promote the understanding and modeling of gas diffusion in nanoporous materials and also provide an efficient...
The transport of gaseous compounds in soil takes place by gas diffusion, advection, and dispersion. Gas transport processes are influenced by the soil-gas diffusion coefficient (Dp), air permeability (ka) and soil-gas dispersion coefficient (DH), respectively. Of three gas transport parameters, DH...
Correlation Between Free Volume Evaluated from Positron Annihilation Lifetime and Gas Diffusion Coefficient of Glassy Polymers Diffusion coefficients D for CO2 and CH4 as well as lifetime τ3 and intensity I3 of ortho-positronium (ο-Ps) were measured for five polymers at temperatu... K Tanaka,...
And shale matrix permeability, diffusion coefficient, desorption constants and other factors can affect the gas flow through shale matrix as well as pressure propagation, which should be taken into consideration in the development of shale gas reservoir. The presented mathematical model provides a new ...
The GDL's transport capability is represented by its effective transport properties: an effective diffusion coefficient for the diffusional transport of mass, absolute and relative permeabilities for the convective transport of mass, effective thermal conductivity for the heat transport, and effective ...
For both CO2and ethane, a clear trend is observed: diffusion rate decreases with processing ZIF-62 > agZIF-62nP > agZIF-62P. These results prove that the pore architecture of ZIFs is strongly dependent on and is even controllable by the liquid-handling process. ...
is dominated by gas diffusion. Specifically, CAU-10-PDC-H (7:3) possesses the highest diffusion coefficient of CO2, rendering it the most increased CO2permeability and selectivity among the three mixed-linker MOF membranes studied herein.