Direct numerical simulation of bubble-liquid mass transfer coupled with chemical reactions: Influence of bubble shape and interface contamination

2011 ◽  
Vol 381 (1-3) ◽  
pp. 130-138 ◽  
Author(s):  
C. Wylock ◽  
A. Larcy ◽  
P. Colinet ◽  
T. Cartage ◽  
B. Haut
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Direct Numerical Simulation ◽  
Chemical Reactions ◽  
Bubble Shape ◽  
Bubble Liquid ◽  
Liquid Mass ◽  
Liquid Mass Transfer

Coupling between Mass Transfer and Chemical Reactions during the Absorption of CO2 in a NaHCO3-Na2CO3 Brine : Experimental and Theoretical Study

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Christophe E Wylock ◽  
Pierre Colinet ◽  
Thierry Cartage ◽  
Benoît Haut
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Chemical Reactions ◽  
Reaction Model ◽  
Gas Absorption ◽  
Diffusion Reaction ◽  
Co2 Absorption ◽  
Bubble Liquid ◽  
Liquid Mass ◽  
Liquid Mass Transfer

This work deals with the study of the gas-liquid mass transfer, coupled with chemical reactions. The case of carbonic gas absorption in a brine of sodium carbonate and bicarbonate is investigated. It is performed in collaboration with Solvay SA. The aim of this work is to get a better understanding of this phenomenon. It would permit an optimization of the refined sodium bicarbonate production process. The basis of developed mathematical models is presented. The CO2 absorption is coupled with several chemical reactions taking place in the liquid phase. A mathematical modelling of this coupling is first developed. The equations of the model are solved numerically, using COMSOL Multiphysics. To model the bubble-liquid mass transfer of CO2, this diffusion-reaction model is completed by a representation of the liquid phase flow around the bubble. In order to validate experimentally each scale of modelling, two experimental devices are proposed.

Direct Numerical Simulation of Mass Transfer from Spherical Bubbles: the Effect of Interface Contamination at Low Reynolds Numbers

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Adil Dani ◽  
Arnaud Cockx ◽  
Pascal Guiraud
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Direct Numerical Simulation ◽  
Reynolds Numbers ◽  
Solid Sphere ◽  
Creeping Flow ◽  
Spherical Bubbles ◽  
Cap Model ◽  
Liquid Mass Transfer ◽  
Low Reynolds

The gas-liquid mass transfer from bubbles is estimated by Direct Numerical Simulation for fully contaminated bubbles behaving as solid spheres, partially contaminated spherical bubbles and clean spherical bubbles. Partial contamination of bubble interface is accounted by the Stagnant Cap Model to show the effect of the surfactant on hydrodynamic and mass transfer at low Reynolds number. Hydrodynamics results are validated by comparison with other works of the literature. The numerical mass transfer is then analysed in term of local and averaged Sherwood numbers. The comparison of DNS results with classical relations gives the good scaling of Sherwood with Pe1/3 and Pe1/2 respectively for solid sphere and clean bubble in creeping flow. For partially contaminated bubble and after validation of simulated drag coefficient, the effect of the contamination on mass transfer is shown for several Peclet numbers. A correlation for Sherwood number in function of contamination angle is then proposed in creeping flow.

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