InterPore2025

Influence of convergent flow on solute transport subjected to rate-limited sorption, in the fluid-saturated porous medium of a finite cylindric shape.

22 May 2025, 15:45

1h 30m

Poster Presentation (MS08) Mixing, dispersion and reaction processes across scales in heterogeneous and fractured media Poster

Speaker

Mr Achille Stephane NGANSO NGOMYAP (Laboratory of earth environmental Physics University of Yaoundé 1, Cameroon, P.O. Box 812, Yaoundé, Cameroon.)

Description

This study deals with the influence of a convergent flow on the solutes transport, subjected to rate-limited sorption in the fluid saturated porous medium of a finite cylindric shape. A simulation of this transport was conducted using the two-dimensional advection-dispersion model, in cylindrical coordinates system. Across the entire inlet surface of the column, the injection of solutes was of the pulse type, modeled by a Dirac delta function. The time-dependent exponential and linear distribution/partition coefficients was used to consider the rate-limited sorption process, and the amplitude of the convergent flow was controlled by variations in the radius 𝑅0 of an orifice though which the effluents are discharged at the column outlet. It resulted that higher distribution kinetics improves sorption in both cases. Furthermore, we show that convergence of the flow introduces an additional dispersion due to the mixing and spreading of the solutes front in the medium, independently of the type of distribution. In addition, the amplitude of this dispersion increases as 𝑅0 decreases. The spatial distributions of solutes reveal that the disturbances induced by the converging flow apply strongly near the orifice, and less at the ends of the column. A convergent flow thus contributes to improving the performance of a sorption system, which in the context of this study could present an alternative for optimizing an adsorbent for the drinking water provision.