Thesis
Adequacy of surface diffusion models to simulate nonequilibrium mass transfer in soils
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/101129
Abstract
Diffusion from intraparticle pore spaces is considered to be the main reason for slow release of contaminants from soil. Diffusion controlled mass transfer can be simulated by the homogeneous surface diffusion model (HSDM). The objective of this paper is to present a simplified HSDM model (SHSDM) and a finite element HSDM model (FEHSDM) to simulate advective-dispersive transport through soils, coupled with intraparticle diffusion, under nonequilibrium conditions and compare these models with the dispersed flow, film and particle diffusion model (DF-FPDM) that has recently been reported in literature. The models, by and large, provide convergent results and remain stable for Peclet number Pe≤2.5 and Courant number Cr≤1.0. The SHSDM and the DF-FPDM predictions are practically the same for mass transfer Biot number Bi≥5. However, considerable difference in the predictions of these two models are observed for Bi≤1. The FEHSDM predictions compare well with experimental data for slightly hydrophobic compounds. The SHSDM and the DF-FPDM predictions, on the other hand, compare well with experimental results for relatively hydrophobic compounds.
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Details
- Title
- Adequacy of surface diffusion models to simulate nonequilibrium mass transfer in soils
- Creators
- Nazmul Hasan
- Contributors
- Akram Hossain (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525121601842
- Language
- English
- Resource Type
- Thesis