Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Porous Media
Импакт фактор: 1.49 5-летний Импакт фактор: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508

Выпуски:
Том 22, 2019 Том 21, 2018 Том 20, 2017 Том 19, 2016 Том 18, 2015 Том 17, 2014 Том 16, 2013 Том 15, 2012 Том 14, 2011 Том 13, 2010 Том 12, 2009 Том 11, 2008 Том 10, 2007 Том 9, 2006 Том 8, 2005 Том 7, 2004 Том 6, 2003 Том 5, 2002 Том 4, 2001 Том 3, 2000 Том 2, 1999 Том 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.v15.i8.30
pages 735-744

ADEQUACY OF SURFACE DIFFUSION MODELS TO SIMULATE NONEQUILIBRIUM MASS TRANSFER IN SOILS

Nazmul Hasan
Civil and Environmental Engineering, Washington State University, Richland, WA 99354
Md. Akram Hossain
Civil and Environmental Engineering, Washington State University, Richland, Washington 99354

Краткое описание

Diffusion from intra-particle pore spaces is considered to be the main reason for the 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 intra-particle 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 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. The SHSDM and the DF-FPDM predictions are practically the same for mass transfer Biot numbers Bi ≥ 20. However, considerable difference in the predictions of these two models is observed for Bi ≤ 1. The SHSDM and the DF-FPDM, by and large, provide convergent results and remain stable for Peclet numbers Pe ≤ 2.5 and Courant number Cr ≤ 1.0, with the FEHSDM requiring finer spatial and temporal discretizations.


Articles with similar content:

Double-Diffusive Convection in Slender Anisotropic Porous Enclosures
Journal of Porous Media, Vol.3, 2000, issue 1
P. Singh, Vinayak Eswaran, P. Bera
STUDY COMBUSTION MODEL OF PETROLEUM COKES BY TGA
Proceedings of Symposium on Energy Engineering in the 21st Century (SEE2000) Volume I-IV, Vol.0, 2000, issue
Bo-Xiong Shen, Han-Ping Chen, De-Chang Liu
FREE CONVECTIVE FLOWS IN LARGE HEATED OIL STORAGE TANKS
International Heat Transfer Conference 7, Vol.3, 1982, issue
R. Pickles, A.C. Mendes de Sousa, James E. S. Venart, M. LaPlante
ASSIMILATION OF COARSE-SCALEDATAUSINGTHE ENSEMBLE KALMAN FILTER
International Journal for Uncertainty Quantification, Vol.1, 2011, issue 1
Yalchin Efendiev, A. Datta-Gupta, Santha Akella
ADEQUACY OF FINITE ELEMENT MODELS TO SIMULATE ADVECTIVE-DISPERSIVE TRANSPORT COUPLED WITH INTRA-PARTICLE DIFFUSION
Journal of Porous Media, Vol.14, 2011, issue 10
Md. Akram Hossain