A simple extensional viscometer |
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Authors: | T. Sridhar R. K. Gupta |
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Affiliation: | (1) Department of Chemical Engineering, Monash University, 3168 Clayton, Victoria, Australia;(2) Department of Chemical Engineering, State University of New York at Buffalo, Clifford C. Furnas Hall, 14260 Amherst, New York, USA |
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Abstract: | An extensional viscometer is described in which the liquid filament leaving a capillary is subjected to a stretching deformation. In order to keep the flow rate through the capillary unaltered upon inception of stretching, the pressure head at the capillary entrance has to be reduced by an amount equal to the extensional viscoelastic stress at the capillary exit. This affords a simple means of measuring small fluid forces such as those that occur in the stretching of dilute polymer solutions. Since stretch rates can be obtained from a knowledge of the mass flow rate and the filament diameter profile, extensional viscosities can be computed. The efficacy of the technique is demonstrated by obtaining the anticipated results for Newtonian liquids. |
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Keywords: | Dilute polymer solution stretching flow extensional viscosity extensional viscometer |
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