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Dynamics of water sorption on a single adsorbent grain caused by a large pressure jump: Modeling of coupled heat and mass transfer by B.N. Okunev; A.P. Gromov; L.I. Heifets; Yu.I. Aristov is a Engineering article available to read on EtoBox.

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Here we present a mathematical model of coupled heat and mass transfer in the course of water adsorption on a single adsorbent grain, which is in thermal contact with an isothermal metal plate. Adsorption is caused by a large jump of vapour pressure over the grain. The radial profiles of the grain temperature and the water concentrations in the adsorbed and gas phases were calculated as a function of time. Strong interrelationship between the shapes of the water sorption isotherm and the radial uptake profile was revealed. The best fit to the experimental data of [B. Dawoud, Yu. I. Aristov, Experimental study on the kinetics of water vapour sorption on selective water sorbents, silica-gels and alumina under typical operating conditions of sorption heat pumps, Int. J. Heat Mass Transfer 46 (2) (2003) 273-281] corresponds to the water diffusivity D e = 6.0 Â 10 À6 m 2 /s and the coefficient of the heat transfer a p = 70 W/(m 2 K) which are larger than those measured in quasi-equilibrium experiments.

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Author

B.N. Okunev; A.P. Gromov; L.I. Heifets; Yu.I. Aristov

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0017-9310)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)