Kinetics of the bridging adsorption of flexible chains in porous media

We present a phenomenological study of the bridging adsorption of flexible chains during the non-inertial flow of polymer solutions in disordered poro us media. Using simple physical arguments we have established the time depe ndence of the concentration of the chains retained in a single pore due to the bridging adsorption. We have then shown, in the limit of vanishing deso rption, that the hydrodynamic resistance scales as a function of time accor ding to an exponential law. (C) 2001 Academie des sciences/Editions scienti fiques et medicales Elsevier SAS.