偏心急縮小流路における高分子溶液の流れ

概要

論文の詳細を見る
Flow visualizations using the two kinds of tracer methods and LDV measurements with shearthinning aqueous solutions of polyacrylamide through an axisymmetric contraction and two eccentric contractions have been carried out. In these experiments the effect of contraction eccentricity on flow patterns has been studied. In the steady regime the largest vortex length for the eccentric contractions is almost the same as that for the axisymmetric contraction ; on the other hand, within the vortex the streak line circulates in a radial plane for the axisymmetric contraction while it spirals from the minimum vortex region toward the maximum one for the eccentric contractions. Furthermore, a "small-scale instability" occurs near the boundary between main flow and upstream end of vortex. Finally the main flow spirals both for the axisymmetric and eccentric contractions in entirely unstable flow regime.
社団法人日本機械学会の論文
1998-07-25