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Modelling mass transport through a porous partition: Effect of pore size distribution.

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Khayet Souhaimi, Mohamed and Velázquez, Armando and Mengual, Juan I. (2004) Modelling mass transport through a porous partition: Effect of pore size distribution. Journal of non-equilibrium thermodynamics, 29 (3). pp. 279-299. ISSN 0340-0204

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Official URL: http://dx.doi.org/10.1515/JNETDY.2004.055


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Abstract

Direct contact membrane distillation process has been studied using microporous polytetrafluoroethylene and polyvinylidene fluoride membranes. The membranes were characterized in terms of their nonwettability, pore size distribution and porosity. The mean pore sizes and pore size distributions were obtained by means of wet/ dry flow method. The mean pore size and the effective porosity of the membranes were also determined from the gas permeation test. A theoretical model that considers the pore size distribution together with the gas transport mechanisms through the membrane pores was developed for this process. The contribution of each mass transport mechanism was analyzed. It was found that both membranes have pore size distributions in the Knudsen region and in the transition between Knudsen and ordinary diffusion region. The transition region was the major contribution to mass transport. The predicted water vapor permeability of the membranes were compared with the experimental ones. The effect of considering pore size distribution instead of mean pore size to predict the water vapor permeability of the membranes was investigated.


Item Type:Article
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© Walter de Gruyter & CO.
The authors of this work gratefully acknowledge the financial support of the ‘‘Comunidad de Madrid’’ through its project Nº 07M/0059/2002.

Uncontrolled Keywords:Thermodynamics; Mechanics.
Subjects:Sciences > Physics > Thermodynamics
ID Code:37217
Deposited On:19 Apr 2016 17:08
Last Modified:19 Apr 2016 17:08

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