COLL 55 |
| Subhash C. Ayirala and Dandina N. Rao. Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, 3516, CEBA Building, Baton Rouge, LA 70803 |
| Interfacial tension between immiscible fluids is an important property for many processes such as enhanced oil recovery by gas injection, flow through porous media, and mass and heat transfer. However, the experimental data on interfacial tension for complex fluid systems involving multi-components is scarce. Therefore there has long been a need for a simple and accurate computational model for prediction of interfacial tension in multi-component hydrocarbon systems. The Parachor model is still widely used to predict the interfacial tension of multi-component hydrocarbon systems. However, Parachor values of pure components are used in these predictions, considering each component of the mixture as if all the others were absent. Due to this assumption, the counter-directional mass transfer mechanisms that affect interfacial tension between the fluids are neglected in the model, resulting in inaccurate interfacial tension predictions for complex multi-component hydrocarbon mixtures. In the present study, the ratio of diffusivity coefficients is introduced in the Parachor model to incorporate counter-directional mass transfer effects. With this modification to account for mass transfer effects in the Parachor model, the sum of weighted squared deviations between the predicted and experimental interfacial tensions were reduced by 50-65%, compared to the unmodified version. This paper presents the modified Parachor model, its predictions and their comparison with experimental measurements |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:40 PM, Sunday, March 28, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |