Abstract
A series of experiments is described using solutions of various concentrations of Polyox coagulant flowing through porous beds of spherical particles. Results are reported, similar to those obtained by James and McLaren, which show a substantial increase in drag. The onset of this drag increase from solvent flow seems to occur at a constant Deborah number multiplied by the square root of the concentration. The flow in a bundle of symmetrical convergent-divergent channels which may serve as a model for a porous medium is analyzed. The presence of elongated particles in the fluid will alter the flow pattern in such a channel from that given by the Stokes’ solution. Assuming the particles to be aligned parallel to the mean flow direction, this flow re-arrangement will attenuate the effect of the particles on the dissipation of mechanical energy. Extended molecules may be misaligned with the streamlines in the diverging section of the channel, which could explain the large increase in drag observed with dilute polymer solutions in porous beds.
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