Butterfly

概要

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The effects of simple shear flow on concentration fluctuations in semidilute solu-Lions of high molecular weight polystyrene are investigated by the flow light scatteringmethod. The shear-rate (p) dependence of scattering was fountd to fall into fourregimes: Regime I at pop. where the scattering is that of homogeneous semidilutesolutions, and Regimes II to IV at p >>'., p. being the critical shear rate for the shear-enhanced concentration fluctuations. In Regime II, a unique butterfly-type scatteringpattern with a dark streak perpendicular to the flow direction appears. The intensityparallel to the flow increases by about 100 times with increasing 5t. In Regime III athigher shear rates, the intensity increase with p tends to saturate, and finally inRegime IV at even higher shear rates, the intensity fum'ther increases and the butterflypattern changes into a two-point pattern elongated normal to the flow, with a broadintensity maximum along the flovz. This pattern change is closely related to anomaliesin rheological behavior.
社団法人日本物理学会の論文
1992-06-15