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We investigate reactive gas mixtures in the kinetic chemical equilibrium regime. Our starting point is a generalized Boltzmann equation with a chemical source term valid for arbitrary reaction mechanisms and yielding a positive entropy production. We rst study the Enskog expansion in the kinetic chemical equilibrium regime. We derive a new set of macroscopic equations in the zerothand rst-order...

abstract rockfill dams are a type of hydraulic control structures used to protect river bed in cases where a considerable reservoir volume is available behind these structures; it could mitigate the floods and provide a gradual depletion of incoming volume of water so that the discharge passing downstream is decreased. one of the main issues on utilizing rockfill dams is to keep its permeabilit...

A common barrier to accurately predicting the fate of reactive contaminants is accurately describing the role of incomplete mixing. In this paper we develop a stochastic analytical framework for an irreversible kinetic bimolecular reaction in a system with anomalous transport, governed by the fractional advection– dispersion equation (fADE). The classical well-mixed (thermodynamic) solution dic...

Reactive transport in saturated/unsaturated porous media is numerically upscaled to the space–time scale of a hypothetical measurement through coarse-grained (CGST) averages. The reactive modeled at fine-grained Darcy by actual number molecules involved reactions which undergo advective and diffusive movements described global random walk (GRW) simulations. CGST averages verify identities simil...

A mathematical model was developed for describing the transport of arsenic, coupled with microbially-mediated biogeochemical processes. The biogeochemical characteristics of arsenic reactive transport processes were investigated in both batch and column tests, which showed that As(V) was reduced to As(III) by Shewanella sp., with the reduced arsenic species subsequently removed by precipitation...

Oxidative dissolution of uranium dioxide (UO(2)) and the subsequent migration of uranium in a subsurface environment and an underground waste disposal have been simulated with reactive transport models. In these systems, hydrogeological and chemical processes are closely entangled and their interdependency has been analyzed in detail, notably with respect to redox reactions, kinetics of mineral...

Reactive transport (RT) couples bio-geo-chemical reactions and transport. RT is important to understand numerous scientific questions solve some engineering problems. highly multidisciplinary, which hinders the development of a body knowledge shared by modelers developers. The goal this paper review basic conceptual issues all problems, so as facilitate advancement along current frontier: bioch...