The initial states of water vapor adsorption in piles of granules: A new approach

• Type: Article in International Scientific Journal
• Date: 2008

Authors

J. M. P. Q. Delgado (Author) FEUP

Journal

Title: Chemical Engineering Communications

Vol. 195 No. 4

Pages: 404-416

ISSN: 0098-6445

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 0 Citations

ISI Web of Science

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-004-2RS

DOI: 10.1080/00986440701707974

Abstract (EN): In this work the wall effect during the initial states of water vapor adsorption was studied for different piles of granules held in a cylindrical container. A new diffusion model was developed for the description of the physical phenomenon whereby water vapor penetrates along the piles of cylindrical pores. The isotherm sorption equation was incorporated as a wall boundary condition of the cylindrical pore. Finally, the differential mass balance equation was solved numerically using a finite-difference method. A second-order central differencing scheme (CDS), in a general nonuniform grid, was adopted. A mathematical expression is proposed for linear sorption isotherm (given as Equation (28) here), and a numerical procedure is presented for the case of nonlinear moisture sorption isotherm. The numerical solutions were tested through the measurement of water vapor mass uptake for different piles of silica gel and breakfast cereals, and the experimental values obtained were in good agreement.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13