Approximation of a radial diffusion model with a multiple-rate model for hetero-disperse particle mixtures |
| |
Authors: | Massoudieh Arash Ju Daeyoung Young Thomas M Ginn Timothy R |
| |
Institution: | Civil and Environmental Engineering Department, University of California, Davis, United States. amassoudieh@ucdavis.edu |
| |
Abstract: | An innovative method is proposed for approximation of the set of radial diffusion equations governing mass exchange between aqueous bulk phase and intra-particle phase for a hetero-disperse mixture of particles such as those occurring in suspension in surface water, in riverine/estuarine sediment beds, in soils and in aquifer materials. For this purpose the temporal variation of concentration at several uniformly distributed points within a normalized representative particle with spherical, cylindrical or planar shape is fitted with a 2-domain linear reversible mass exchange model. The approximation method is then superposed in order to generalize the model to a hetero-disperse mixture of particles. The method can reduce the computational effort needed in solving the intra-particle mass exchange of a hetero-disperse mixture of particles significantly and also the error due to the approximation is shown to be relatively small. The method is applied to describe desorption batch experiment of 1,2-dichlorobenzene from four different soils with known particle size distributions and it could produce good agreement with experimental data. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|