On the extensional viscosity of mobile polymer solutions |
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| Authors: | D. M. Jones K. Walters P. R. Williams |
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| Affiliation: | (1) Department of Mathematics, University College of Wales, SY23 3BZ Penglais, Aberystwyth, UK;(2) Department of Chemical Engineering, University College of Wales, SA2 8PP Swansea, West Glamorgan, UK |
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| Abstract: | We describe experimental results on the extensional viscosity of mobile polymer solutions obtained from two instruments, the first being a commercial Spin Line Rheometer and the second a custom-built lubricated-die Converging Flow Rheometer. The interpretation of data in terms of Trouton ratios is facilitated by a simple analysis for the Generalized Newtonian Fluid model.Agreement between data from the two rheometers is satisfactory and we show that polymer solutions can be either tension stiffening or tension thinning. However, the Trouton ratios in both cases are greater than the Newtonian values and we anticipate that this will always be the case for polymer solutions.Invited paper, presented at the 2nd Conference of European Rheologists, Prague, June 17–20, 1986 |
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| Keywords: | Extensional viscosity polymer solution Spin Line Rheometer Converging Flow Rheometer Trouton ratio |
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