Polymer transport in porous

In the following sections, the experimental results which have been found in various studies of single-phase polymer flow in 1-D porous media will be discussed. Results will be referred to the convection-dispersion equation outlined above as a model for the flow. However, when there are deviations from this, the appropriate equations/models will be developed. In addition to discussing the macroscopic fit of the generalised convection-dispersion model for polymer transport in porous media, some aspects of the microscopic or physical basis of the phenomena under consideration will also be discussed. 

The impact of inaccessible PV on polymer transport in porous rocks often is concealed by polymer retention. In displacement experiments where a constant polymer concentration is injected into a porous medium that has not been contacted previously by polymer, retention causes the effluent concentration to lag, as seen in Fig. 5.27.28 However, inaccessible PV offsets part or all of this... 

Vol. 1 Polymer Engineering Vol. 2 Filtration Post-Treatment Processes Vol. 3 Multicomponent Diffusion Vol. 4 Transport in Porous Catalysts... 

Saltzman, W. M., Pasternak, S. H., and Langer, R., Micro-structural models for diffusive transport in porous polymers, in Controlled-Release Technology, ACS Symposium Series 348... 

Microstructural Models for Diffusive Transport in Porous Polymers... 

The results from this analysis can now be used to construct geometrically accurate models of the diffusive transport in porous polymers. Previous models of diffusion in these polymers have used an empirically determined tortuosity factor as a lumped parameter to account for the retardation of release by all mechanisms (7-8). 

A question of great interest is the influence of disorder in the medium on the universality class of dissolved flexible polymers, namely ire the imiversal exponents (1) in this c ise the same as in the pure case The question of how line tr polymers behave in disordered media is not only interesting from a theoretical point of view, but is also relevant for understanding transport properties of polymer chains in porous media, such as an oil recovery, gel electrophoresis, gel permeation chromatography, etc. [14]. 

Saltzman, W. M., 1990, Transport in porous polymers, in Absorbent Polymer Technology (L. Brannon-Peppas and R. S. Harland, eds.), Elsevier, Amsterdam, pp. 171-199. 

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