Abstract
Purely elastic interfacial stability of superposed plane Poiseuille flow of polymeric liquids has been investigated utilizing both asymptotic and numerical techniques. It is shown that these instabilities are caused by an unfavorable jump in the first normal stress difference across the fluid interface. To determine the significance of these instabilities in finite experimental geometries, a comparison between the maximum growth rates of purely elastic instabilities with instabilities driven primarily by a viscosity or a combined viscosity and elasticity difference is made. Based on this comparison, it is shown that purely elastic interfacial instabilities can play a major role in superposed flow of polymeric liquids in finite experimental geometries.
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Su, Y.Y., Khomami, B. Purely elastic interfacial instabilities in superposed flow of polymeric fluids. Rheola Acta 31, 413–420 (1992). https://doi.org/10.1007/BF00701121
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DOI: https://doi.org/10.1007/BF00701121