eprintid: 5799
rev_number: 20
eprint_status: archive
userid: 2043
dir: disk0/00/00/57/99
datestamp: 2011-01-25 12:14:32
lastmod: 2016-04-20 14:31:06
status_changed: 2011-01-25 12:14:32
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Mancebo, Francisco J.
creators_name: Vega de Prada, José Manuel
title: Weakly Nonuniform Thermal Effects in a Porous Catalyst: Asymptotic Models and Local Nonlinear Stability of the Steady States.
ispublished: pub
subjects: matematicas
keywords: porous catalysts, weakly nonlinear stability, normal form
abstract: This paper considers a first-order, irreversible exothermic reaction in a bounded porous catalyst, with smooth boundary, in one, two, and three space dimensions. It is assumed that the characteristic reaction time is sufficiently small for the chemical reaction to be confined to a thin layer near the boundary of the catalyst, and that the thermal diffusivity is large enough for the temperature to be uniform in the reaction layer, but that it is not so large as to avoid significant thermal gradients inside the catalyst. For appropriate realistic limiting values of the several nondimensional parameters of the problem, several time-dependent asymptotic models are derived that account for the chemical reaction at the boundary (that becomes essentially impervious to the reactant), heat conduction inside the catalyst, and exchange of heat and reactant with the surrounding unreacted fluid. These models possess asymmetrical steady states for symmetric shapes of the catalyst, and some of them exhibit a rich dynamic behavior that includes quasi-periodic phenomena. In one case, the linear stability of the steady states, and also the local bifurcation to quasi-periodic solutions via center manifold theory and normal form reduction, are analyzed.
date: 1992-10
date_type: published
publisher: SIAM - Society for Industrial and Applied Mathematics
official_url: http://www.jstor.org/stable/view/2102307
full_text_status: public
publication: SIAM Journal on Applied Mathematics
volume: 52
number: 5
pagerange: 1238-1259
institution: Aeronauticos
department: Fundamentos
refereed: TRUE
issn: 0036-1399
rights: by-nc-nd
citation:   Mancebo, Francisco J. and Vega de Prada, José Manuel  (1992).  Weakly Nonuniform Thermal Effects in a Porous Catalyst: Asymptotic Models and Local Nonlinear Stability of the Steady States..   "SIAM Journal on Applied Mathematics", v. 52  (n. 5);   pp. 1238-1259.  ISSN 0036-1399.    
document_url: https://oa.upm.es/5799/2/Vega_04.pdf