Thermodiffusion effect for a non-associating mixture in a multi layered system of porous media and fluid layers heated from above

A numerical simulation has been conducted to investigate the thermodiffusion phenomenon in a porous layer sandwiched between two liquid layers that are wetted with water alcohol mixtures at different water concentrations. Two different binary mixtures with different Soret coefficients have been used...

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Bibliographic Details
Published in:Canadian journal of chemical engineering 2013-10, Vol.91 (10), p.1702-1710
Main Authors: Jawad, H., Bataller, H., Saghir, M.Z.
Format: Article
Language:English
Subjects:
binary liquids
Binary mixtures
Chemical engineering
Computational fluid dynamics
Engineering Sciences
Holes
Isopropanol
Liquids
Materials
Mechanics
Mechanics of materials
Migration
multi-layered
Physics
porous media
Soret coefficient
soret effect
thermodiffusion
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Summary:A numerical simulation has been conducted to investigate the thermodiffusion phenomenon in a porous layer sandwiched between two liquid layers that are wetted with water alcohol mixtures at different water concentrations. Two different binary mixtures with different Soret coefficients have been used in the entire system, one with a negative Soret coefficient and the other one with a positive sign. The results show that the direction of the component migration in a porous layer depends on the sign of the Soret coefficient. For a binary mixture with a negative Soret coefficient, such as 10% isopropanol and 90% water, the heavier species move in the direction of the hot surface, while for a mixture with a positive Soret effect, such as 50% isopropanol and 50% water, the heavier species migrate toward the colder surface. To reduce the gravity effect, the cavity was heated from the top with different temperatures ranging from 5 to 20 K.
ISSN:0008-4034
1939-019X
DOI:10.1002/cjce.21809