Results 291 to 300 of about 929,200 (373)
Some of the next articles are maybe not open access.
The coal-gas system - the effective diffusion coefficient
International Journal of Oil, Gas and Coal Technology, 2016In this paper issues concerning the evaluation of the kinetics of gas release from coal samples were systematised. Our own analytical solution was presented. Diffusion equation was solved numerically. The numerical solution of Fick's formula taking into account of the Langmuir isotherm was compared with the analytical solution based on the Henry ...
Norbert Skoczylas, J. Topolnicki
openaire +3 more sources
Advanced Engineering Materials, 2021
The effective gas diffusion coefficient describes the process of gas diffusion in porous materials. Several materials have a significant number of micropores in the lower nanometre range leading to a reduction of gas diffusion (Knudsen effect).
C. Strangfeld
semanticscholar +1 more source
The effective gas diffusion coefficient describes the process of gas diffusion in porous materials. Several materials have a significant number of micropores in the lower nanometre range leading to a reduction of gas diffusion (Knudsen effect).
C. Strangfeld
semanticscholar +1 more source
Fuel Cells, 2021
Parameters estimation is important in fuel cell modelling and it remains a challenging task to predict. One of the most discussed parameters is the water diffusion coefficient in Nafion® membrane, which has a huge variation (10−9 and 10−5 cm2 s−1), based
K. Chadha, S. Martemianov, A. Thomas
semanticscholar +1 more source
Parameters estimation is important in fuel cell modelling and it remains a challenging task to predict. One of the most discussed parameters is the water diffusion coefficient in Nafion® membrane, which has a huge variation (10−9 and 10−5 cm2 s−1), based
K. Chadha, S. Martemianov, A. Thomas
semanticscholar +1 more source
Ternary diffusion and effective diffusion coefficients in alveolar spaces
Respiration Physiology, 1980An experimentally verified mathematical model of non-equimolar ternary gas diffusion is applied to simulate the conditions existing in the alveolar spaces. When a fictitious gas film is erected a certain distance away from the alveolar membrane, and when the compositions at the two boundaries of the film are, respectively, the alveolar gas composition ...
Leon E. Farhi +3 more
openaire +3 more sources
Effective Diffusion Coefficients of Glucose in Artificial Biofilms
Environmental Technology, 2005A technique using horizontal attenuated total reflection (HATR) by Fourier transform infrared (FTIR) spectrometry was demonstrated for the determination of effective diffusion coefficient (De) of an inert solute in biofilm. Glucose was the selected solute, and agarose (1%) hydrogel films containing various concentrations of activated sludge biomass ...
Zhang, T, Fang, HHP
openaire +4 more sources
Five-phase modelling for effective diffusion coefficient of chlorides in recycled concrete
Magazine of Concrete Research, 2017With the utilisation of recycled aggregate concrete (RAC) in building construction, the durability of this material requires particular attention, especially in terms of chloride penetration.
Zhi Hu +6 more
semanticscholar +1 more source
The effect of temperature on the diffusion coefficient of 212Pb
Science of The Total Environment, 1993Abstract The temperature dependence of the diffusion coefficient of 212 Pb in nitrogen was investigated using a diffusion sampler at a constant relative humidity of 10% ( P H 2 O =2.25 mmHg at 21.5°C, 5.0 mmHg at 35°C, 8.0 mmHg at 45°C and 12.0 mmHg at 55°C), and a constant water vapour pressure of 15 mmHg (70% RH at 21.5°C), in the presence of ...
C.R. Phillips, S.L. Gong
openaire +2 more sources
Effective diffusion coefficients in coal chars
Proceedings of the Combustion Institute, 2000Knowledge of effective diffusion coefficients in char particles is important when interpreting experimental reactivity measurements and modeling char combustion or NO and N 2 O reduction. In this work. NO and N 2 O reaction with a bituminous coal char was studied in a fixed-bed quartz glass reactor.
Anker Degn Jensen, Jan Erik Johnsson
openaire +2 more sources
Generalized method calculating the effective diffusion coefficient in periodic channels.
Journal of Chemical Physics, 2015The method calculating the effective diffusion coefficient in an arbitrary periodic two-dimensional channel, presented in our previous paper [P. Kalinay, J. Chem. Phys.
P. Kalinay
semanticscholar +1 more source
Ageing effect of chloride diffusion coefficient
ConcreteLife'06 - International RILEM-JCI Seminar on Concrete Durability and Service Life Planning: Curing, Crack Control, Performance in Harsh Environments, 2006Most of the currently used models to predict chloride ingress a constant diffusion coefficient over time. However, a reduction of the diffusion coefficient over time, is ob-served at specimens that are exposed to chlorides. This reduction of the diffusion coefficient is expressed with the ageing coefficient.
openaire +3 more sources