Dissipative particle dynamics model for colloid transport in porous media
Pan W, and AM Tartakovsky. 2013. "Dissipative particle dynamics model for colloid transport in porous media." Advances in Water Resources 58:41-48. doi:10.1016/j.advwatres.2013.04.004
We present that the transport of colloidal particles in porous media can be effectively modeled with a new formulation of dissipative particle dynamics, which augments standard DPD with non-central dissipative shear forces between particles while preserving angular momentum. Our previous studies have demonstrated that the new formulation is able to capture accurately the drag forces as well as the drag torques on colloidal particles that result from the hydrodynamic retardation eﬀect. In the present work, we use the new formulation to study the contact eﬃciency in colloid ﬁltration in saturated porous media. Note that the present model include all transport mechanisms simultaneously, including gravitational sedimentation, interception and Brownian diﬀusion. Our results of contact eﬃciency show a good agreement with the predictions of the correlation equation proposed by Tufenkji and EliMelech, which also incorporate all transport mechanisms simultaneously without the additivity assumption.