粘弾性流体の流路内流動に伴う異常現象に関する研究 : 流路出口近傍の流れと圧力変動

概要

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When a viscoelastic fluid flows out from a horizontal duct, many cracks and protruding ridges are formed on the jet surface. The jet states are affected by the shape of the duct exit. For the knife edge shaped exit, the jet appears in three states, i. e. the stable state, the breakage state, and the multiplication state. For the semi-cylinder shaped exit the jet appears as another state instead of the breakage state. We call this the "stationary state". In this state, stationary ridges occur on the jet, and they become regularly large as the shear rate increases. Anomalous pressure fluctuation is observed near the duct exit in the breakage state and the multiplication state. In the stationary state the pressure fluctuation is not observed, but the disproportional pressure distribution for the duct width direction is. A large vortex occurs on the end of the duct floor wall for the knife edge shaped exit. In the stable state it is steady and two dimensional, and in the anomalous state it is unsteady and three dimentional. But for the semi-cylinder shaped exit the vortex does not appear, regardless of the jet states.
社団法人日本機械学会の論文
1989-02-25