抄録
Axial velocity distribution of a steady tube flow was measured using magnetic resonance imaging (MRI). Test fluids were aqueous solutions of carboxymethyl cellulose (CMC) containing solid particles (glass flake or glass bead) at high volume fractions. As a result, we observed a plug-like velocity distribution in the tube flow. This velocity distribution measured by MRI had a good agreement with that numerically calculated using the viscosity curve of the test fluid. Furthermore the effect of suspended particles on the velocity distribution in the tube flow with an abrupt contraction was also examined. We observed a plug flow for the CMC solution and the bead suspension, but a concave region in the velocity distribution near the centerline at upstream of the contraction for the concentrated flake suspension. This velocity distribution is caused by the shape of the glass flake particle.
