Effect of an absorbate concentration level on the coupled mass and heat transfer during short gas plugs dissolution

We studied gas absorption from a rising gas plug when the concentration lev el of the absorbate in the absorbent is finite (finite dilution of absorbat e approximation). It is shown that in the case of the finite dilution the l ateral convective term in the equation of convective mass transfer in the a bsorbate must be taken into account, It is found that the mass transfer rat e increases with the increase of the absorbate concentration level. Isother mal and nonisothermal absorptions are considered whereby the latter is desc ribed by the coupled equations of mass and heat transfer. It is Found that the mass transfer rate decreases when the dimensionless heat of absorption increases. (C) 2000 Editions scientifiques et medicales Elsevier SAS.