A New Model for Estimation of Diffusion Coefficients of Some Gases in Water
Document Type : Review
Abstract
Diffusion Coefficient is the most important effective parameter in mass transfer. A correlation for estimating the diffusion coefficients of some gases is presented. The new correlation is based on physical properties of the solvent and solute which are available with a minimum cost. The modeling is based on Wilke-Chang model with empirical corrections in which solute molecule radius (R) and ξ parameter have been taken into account. The results reveals that while Wilke-Chang correlation for prediction of diffusion of CO_2, N_2 and O_2 has the 9% error and new correlation has only 3.8%. Also Wilke-Chang prediction for diffusion of CO2 in water has 6.5% error while new model predicts that with 2.7% error.
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