A Study on an Anomalous Phenomenon Occurring in the Issuing of Viscoelastic Fluids from Ducts : Effects of Gravity and Fall Length on the Anomalous Phenomenon

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...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series B Vol. 55; no. 516; pp. 2238 - 2244
Main Authors TAKAHASHI, Tsutomu, TOMITA, Yukio
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.08.1989
Subjects
Dimensional Analysis Method
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Summary: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.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.55.2238