Abstract
THE first and major point raised by Bagley, Rudin and Schreiber is that when they compare my results1 for the onset of flow instability in cone-and-plate viscometers with those for the onset of flow instability in capillary extruders they observe discrepancies. For example, the critical shear stress in the first type of instrument is independent of molecular weight and dependent on geometry, whereas in the second type it is dependent on molecular weight and independent of geometry. They have chosen the conclusion that what I have observed and measured is some other phenomenon than the one observed in capillaries. While this may be a correct conclusion it certainly does not follow from their argument about effects of ‘geometry’, and I think it is an incorrect conclusion for the following reasons.
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References
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HUTTON, J. Fracture of Liquids in Shear. Nature 203, 177 (1964). https://doi.org/10.1038/203177a0
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DOI: https://doi.org/10.1038/203177a0
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