text: theses.fr – Sid-Ali Amine Toudji , Pervaporation de composés purs : approche expérimentale du couplage entre transfert de matière et transfert de chaleur
  par Sid-Ali Amine Toudji
  Sous la direction de Emilie Carretier, Jean-Laurent Gardarein et de Jean-Philippe Bonnet.
  Le jury était composé de Murielle Rabiller-Baudry, David Dominique Brutin.
  Les rapporteurs étaient Laetitia Perez, Éric Favre.
  Densité de flux de matière
  Pervaporation of pure compounds : experimental approach of the coupling between mass and heat transfer
  The aim of this work is to study the pervaporation process and specifically to understand the mass and heat transport mechanisms in a dense polymeric membrane. A better understanding of these mechanisms would make it possible to improve the limiting parameters for the development of this process, such as the low mass fluxes as well as the origin and the quantity of heat required for transport through the membrane. In order to answer these questions, we have developed an experimental setup that allows simultaneous measurement of mass flux and heat flux density. The dead-end permeation of the setup developed gives access to the temperature profile of the liquid feed. These temperature data make possible the estimation of the heat flux densities engaged during the pervaporation experiments by means of an inverse computation coupled with a STAR CCM + simulation. The mass flux is measured by a new method in addition to the gravimetric method used as a reference. The new method uses a pressure sensor located in the feed tank to continuously measure the mass flux with 1Hz raw acquisition frequency synchronized with the temperature measurement. In order to simplify the experimental constraints, we applied only permeation of pure liquids. The correlation of the two fluxes (mass and heat density) measured led us to observe that the amount of heat taken to the feed side to pervaporate a unit mass of pure liquid is less than the amount of heat required to vaporize the same liquid. It represents 50% of it in the case of water and only 25% in the case of the ethanol.