急拡大部を有するスリット流路を通過する繊維分散流体の流れ中における短繊維の配向と濃度分布 : 機械要素,潤滑,工作,生産管理など

概要

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Distributions of fiber orientation and fiber concentration were measured in the flow of a dilute fiber suspension through a slit channel with a sudden expansion. Fibers were observed between crossed polarizers rotating at a high speed. The suspending fluids are solutions of polyacrylamide (PAA) at the concentration of 35 ppm or 100 ppm and Newtonian fluid. All the fluids have the same values in the shear viscosity. However, the 100 ppm PAA fluid has the largest elongational viscosity. For the PAA fluids, the fibers rapidly orient in the direction perpendicular to the flow direction near the centerline just downstream of the expansion. Furthermore, the fibers keep the orientation in downstream region. For the Newtonian fluid, the fibers randomly orient downstream of the expansion and rapidly orient in the flow direction in the downstream region. The distribution of fiber orientation for the PAA fluids just downstream of the expansion is due to the large elongational viscosity. Further, the fiber concentration for each fluid shows a maximum near the channel wall. These distributions are due to fiber-wall interaction.
社団法人日本機械学会の論文
2001-05-25