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Gas permeation and direct contact membrane distillation experiments and their analysis using different models

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Fernández Pineda, Cristóbal and Izquierdo Gil, María Amparo and García Payo, María del Carmen (2002) Gas permeation and direct contact membrane distillation experiments and their analysis using different models. Journal of Membrane Science, 198 (1). pp. 33-49. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/S0376-7388(01)00605-6


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Abstract

Gas permeation experiments using helium, air and argon and direct contact membrane distillation (DCMD) experiments using distilled water are reported. From gas permeation experiments the characteristic parameters of the Knudsen and Poiseuille transport mechanisms were determined. Such parameters were extrapolated in order to obtain the values corresponding to water vapour and these were used to estimate theoretical fluxes in DCMD processes employing two different models, one proposed by Schofield et al. (with some improvements) and another one according to the "Dusty-Gas" literature. In both models, the different transport mechanisms: ordinary diffusion, Knudsen flow and Poiseuille flow were taken into account. A good agreement between the experimental fluxes and their theoretical predictions was found. A comparison between both models was also carried out. It was proved that in both models the viscous flow could be neglected under our experimental conditions.


Item Type:Article
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© 2002 Elsevier Science B.V. The authors wish to thank CICYT (Spain), Project PB-98-07-88, for the financial support accorded to this work.

Uncontrolled Keywords:Direct contact membrane distillation; Gas permeation; "Dusty-gas" model; Knudsen flow; Ordinary diffusion; Viscous flow
Subjects:Sciences > Physics > Thermodynamics
ID Code:25310
Deposited On:09 May 2014 07:33
Last Modified:11 Mar 2016 19:19

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