Numerical comparison between relaxation and nonlinear equilibrium models. Application to chemical engineering

James, F; Postel, M; Sepúlveda M.

Abstract

A model to take into account the finite exchange kinetic for the equilibrium between phases in the chromatography experiment is studied. The resulting hyperbolic system with a nonlinear relaxation term is then formally treated with a Chapman-Enskog type expansion. A first order correction to the classical quasilinear hyperbolic model is derived which. consists of a nonlinear diffusion term. Numerical schemes for both models - relaxed and parabolic - are then rested and compared for different initial and boundary values. A range of validity for the first order approximation is obtained through numerical simulations where its computational performance indicates that it should be advantageously used. (C) 2000 Elsevier Science B.V. All rights reserved.

Más información

Título según WOS: Numerical comparison between relaxation and nonlinear equilibrium models. Application to chemical engineering
Título según SCOPUS: Numerical comparison between relaxation and nonlinear equilibrium models. Application to chemical engineering
Título de la Revista: PHYSICA D-NONLINEAR PHENOMENA
Volumen: 138
Número: 3-4
Editorial: Elsevier
Fecha de publicación: 2000
Página de inicio: 316
Página final: 333
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0167278999002031
DOI:

10.1016/S0167-2789(99)00203-1

Notas: ISI, SCOPUS