Numerical model of non-isothermal pervaporation in a rectangular channel



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García Villaluenga, Juan Pedro and Cohen, Yoram (2005) Numerical model of non-isothermal pervaporation in a rectangular channel. Journal of membrane science, 260 (01-feb). pp. 119-130. ISSN 0376-7388

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A numerical model of non-isothermal pervaporation was developed to investigate the development of the velocity, concentration and temperature fields in rectangular membrane module geometry. The model consists of the coupled Navier-Stokes equations to describe the flow field, the energy equation for the temperature field, and the species convection-diffusion equations for the concentration fields of the solution species. The coupled nonlinear transport equations were solved simultaneously for the velocity, temperature and concentration fields via a finite element approach. Simulation test cases for trichloroethylene/water, ethanol/water and iso-propanol/water pervaporation, under laminar flow conditions, revealed temperature drop axially along the module and orthogonal to the membrane surface. The nonlinear character of the concentration and temperature boundary-layers are most significant near the membrane surface. Estimation of the mass transfer coefficient assuming isothermal assumption conditions can significantly deviate from the non-isothermal predictions. For laminar conditions, predictions of the feed-side mass transfer coefficient converged to predictions from the classical Leveque solution as the feed temperature approached the permeate temperature.

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© 2005 Elsevier B.V.

Uncontrolled Keywords:Pervaporation, Non-Isothermal, Numerical Model, Finite Element Method, Ethanol Dehydration, Trichloroethylene, Iso-Propanol
Subjects:Sciences > Physics > Thermodynamics
ID Code:24887
Deposited On:02 Apr 2014 10:40
Last Modified:05 Nov 2015 16:36

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