TY - JOUR
T1 - The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials
AU - Jacops, Elke
AU - Aertsens, Marc
AU - Maes, Norbert
AU - Bruggeman, Christophe
AU - Swennen, Rudy
AU - Krooss, Bernhard
AU - Amann-Hildenbrand, Alexandra
AU - Littke, Ralf
N1 - Score=10
PY - 2017/12/27
Y1 - 2017/12/27
N2 - In order to investigate in more detail the relation between the size of diffusing molecules and their diffusion coefficients (and geometric factors), diffusion experiments with gases of different size and tritiated water (HTO) have been performed on different clayey samples (BoomClay, Eigenbilzen Sands, Opalinus Clay, Callovo-Oxfordian Clay, and bentonite with different dry densities). We observed that, for unreactive gases in clayey materials, the effective diffusion coefficient varies with the size of the diffusing molecule and this variation can be described by an exponential or a power law function.The variation of the geometric factor can also be described by an exponential function.The observed experimental relations can be used to estimate diffusion coefficients; by measuring experimentally in clay the effective diffusion coefficient of two unreactive dissolved gases with a different size, the diffusion coefficients of other dissolved gases (with a size in between the two measured gases) can be estimated by using the fitted exponential relationship.
AB - In order to investigate in more detail the relation between the size of diffusing molecules and their diffusion coefficients (and geometric factors), diffusion experiments with gases of different size and tritiated water (HTO) have been performed on different clayey samples (BoomClay, Eigenbilzen Sands, Opalinus Clay, Callovo-Oxfordian Clay, and bentonite with different dry densities). We observed that, for unreactive gases in clayey materials, the effective diffusion coefficient varies with the size of the diffusing molecule and this variation can be described by an exponential or a power law function.The variation of the geometric factor can also be described by an exponential function.The observed experimental relations can be used to estimate diffusion coefficients; by measuring experimentally in clay the effective diffusion coefficient of two unreactive dissolved gases with a different size, the diffusion coefficients of other dissolved gases (with a size in between the two measured gases) can be estimated by using the fitted exponential relationship.
KW - diffusing molecules
KW - diffusion coefficients
KW - gas
KW - HTO
KW - clay
KW - bentonite
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/30378158
U2 - 10.1155/2017/8652560
DO - 10.1155/2017/8652560
M3 - Article
SN - 1468-8123
VL - 2017
SP - 1
EP - 17
JO - Geofluids
JF - Geofluids
M1 - ID 8652560
ER -