LINEAR DRIVING-FORCE APPROXIMATION FOR ISOTHERMAL NON-ISOBARIC DIFFUSION/CONVECTION WITH BINARY LANGMUIR ADSORPTION

• Type: Article in International Scientific Journal
• Date: 1995

Authors

Adélio Mendes (Author) FEUP; Carlos Costa (Author) FEUP; Alírio Rodrigues (Author) FEUP

Journal

Title: Gas Separation and Purification

Vol. 9

Pages: 259-270

ISSN: 0950-4214

Publisher: Pergamon Press - Elsevier

Indexing

ISI Web of Knowledge - 13 Citations

ISI Web of Science

Scopus - 17 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Physical sciences > Chemistry > Physical chemistry > Surface chemistry ; Technological sciences > Technology > Biotecnology > Downstream processing

Other information

Authenticus ID: P-001-FX4

DOI: 10.1016/0950-4214(95)00008-y

Abstract (EN): This paper presents several reduced models for the intraparticle diffusion/convection mechanisms in spherical homoporous particles under isothermal conditions. These semiempirical linear driving force approximations were developed for the cyclic steady state that is attained when a cyclic concentration and/or total pressure perturbation is imposed at the particle surface. The models are applicable to linear systems or those obeying bicomponent Langmuir isotherms. The linear driving force approximations have two or three parameters for each component and are presented for the following cases: Knudsen diffusion, molecular diffusion, molecular plus Knudsen diffusion in series, viscous flow, and also for both diffusion mechanisms in series, in parallel with the convective flow, as in the dusty gas model. Comparison between the results obtained with these approximations and with the complete models shows that on average the relative quadratic error is approximate to 10% for non-smooth and 5% for smoother perturbations.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12