Figure 1. Composition dependence of the diffusion coefficient, D, for helium (Shelby 1996) and sodium (Frischat 1975) in xNa2O:(1−x)SiO2, and of the Haven ratio, HR, for sodium (Kelly et al. 1980) in xNa2O:(1−x)GeO2 glass. 1.2 Reactive Gases Diffusion of reactive gases is ...
While further comparisons need to be conducted for various moisture contents and different soil types, the results of this study suggest that the push-pull test is an effective tool for estimating diffusion coefficients and can be used to validate empirical relationships for diffusion coefficient....
For the purpose of simple and accurate calculation and determination of coal particle gas methane diffusion coefficient,a method based on diffusion equation and similarity theory was discussed.Firstly,a similarity criterion was derived from diffusion equation by similarity theory. And then,a regression re...
perspectives: 1) examining the shift of diffusivity caused by nanopore confinement effects from phase change (phase composition and fluid property) perspective, and 2) calculating the effective diffusion coefficient in porous media by incorporating rock intrinsic properties (porosity and tortuosity factor)...
In connection with a program to study the behavior of punctured fuel elements for the Tokai Atomic Power Reactor, the diffusion coefficient of fission gas in uranium oxide powder formed by CO2 oxidation of U was determined by post-irradiation experiment, in which the fractional release of fission...
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.
diffusion coefficient by the characteristic time and functional scaling-up methods. It has been shown that PMP as a biphasic system may be characterized by one diffusion coefficient that includes the contributions of diffusion in the amorphous and crystalline phases. It has also been shown that ...
Temperature T(°C)Diffusion coefficient D(cm2/s) Empty Cellair - vaporhydrogen - vapor 30 0.2165 0.7874 60 0.2659 0.9452 80 0.2972 1.0560 The properties of bulk fiber and water are evaluated at a constant temperature of 60°C, as preliminary tests suggested that their temperature had a neglig...
In particular, TMM has been used to describe thermal desorption spectra [13,14], the effect of surface reconstruction on the apparent Arrhenius parameters for desorption [15,16] and the coverage dependence of the chemical diffusion coefficient [9,10]. To describe rate processes one should, ...