急拡大部を有するスリット流路を流れる短繊維濃厚分散流体中の繊維配向と濃度分布 : 繊維間干渉と高分子の影響

概要

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Distributions of fiber orientation and fiber concentration were measured in the flow of a concentrated fiber suspension through a slit channel with a sudden expansion. The suspending fluids are a 200ppm solution of polyacrylamide and a Newtonian fluid. For a concentrated fiber suspension in the polymer solution, the fibers rapidly orient in the direction perpendicular to the flow direction just downstream of the expansion. Moreover, the fiber orientation in the polymer solution has a distribution similar to that in the Newtonian fluid. These sudden changes in orientation at the expansion are due to fiber fiber interaction. For a dilute fiber suspension in the polymer solution, the fiber orientation is greatly different from that in the Newtonian fluid at the expansion and in the downstream region, which is caused by a large elongational viscosity of polymer solution. Therefore, in the concentrated suspension, it was found that fiber fiber interaction strongly affects the distribution of fiber orientation in the expansion flow, while the elongational viscosity has little effect on it. On the other hand, polymers had little effect on the fiber concentration distribution. Thus fiber concentration is caused only by fiber-fiber interaction.
社団法人日本機械学会の論文
2001-10-25