Summary
Using the cone- and-plate apparatus ofAdams andLodge, values of pressure gradient,r-d¯p/dr in a range 300 to 3000 dyn/cm2, have been measured to an accuracy of 1% at shear rates near 10 sec−1 in liquids of viscosity less than 200 poise. Using the constancy of pressure gradient at a given shear rate as an indicator of liquid stability, it was found that a polyisobutene liquid containing 2% of ‘Oppanol B 200’ in ‘Oppanol B I’, when stored at rest at 25 °C, was stable during a certain 7-day period after dissolution and unstable during the subsequent 30 days.
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Lipson, J.M., Lodge, A.S. Determination of normal stress differences in steady shear flow. Rheol Acta 7, 364–368 (1968). https://doi.org/10.1007/BF01984854
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DOI: https://doi.org/10.1007/BF01984854