粘弾性流体の流路内流動に伴う異常現象に関する研究 : 重力,落下距離の影響

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. In this paper, the effects of gravity and fall length of the jet on the anomalous phenomenon are investigated. Firstly, we shown that the anomalous phenomenon does not appear on jets extruded into water. Secondly, we clarify that the appearance critical shear rate of the anomalous phenomenon increases with an increasing angle of inclination of the duct which is measured downward from the horizontal plane and with a decreasing fall length of the jet. Moreover, making use of the dimensional analysis method considering the effects on these various factors, we find an empirical formula for the appearance critical point of the anomalous phenomenon.
社団法人日本機械学会の論文
1989-08-25