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In this paper, we extend the Reduced Similar Geometry (RSG) concept to irregular triangular tubes for arbitrary contact angles. Analytical expressions for the normalized threshold curvatures and the wetting phase saturation in triangular tubes are derived and analyzed. Comparison of the results for triangular tubes with different triangular shapes of the same shape factor shows, for the first time,...
In the first part of this work (Dong et al., Transport Porous Media, 59, 1–18, 2005), an interacting capillary bundle model was developed for analysing immiscible displacement processes in porous media. In this paper, the second part of the work, the model is applied to analyse the fluid dynamics of immiscible displacements. The analysis includes: (1) free spontaneous imbibition, (2) the effects of...
An interacting capillary bundle model is developed for analysing immiscible displacement processes in porous media. In this model, pressure equilibration among the capillaries is stipulated and capillary forces are included. This feature makes the model entirely different from the traditional tube bundle models in which fluids in different capillaries are independent of each other. In this work, displacements...
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