Modelling of polymer and tracer dispersion

There are two overall approaches to explaining the fact that the dispersion coefficient of polymer is larger than that of tracer under otherwise identical 

A more interesting way to plot the calculations is in the form of certain dimensionless groups which have been discussed extensively in the literature on hydrodynamic dispersion (Fried and Cambarnous, 1971) the groups in question are D/UL and the group UL/Dq where U is the fluid superficial velocity, L is the macroscopic length of the medium, D is the calculated 

PECLET No., Pe = 302 RETARDATION FACTOR. RF = 0-9A8 FLOWING FRACTION, 3 = 0-960 MASS TRANSFER COEFFICIENT. 0) = 0-267 

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