Abstract
IN a previous communication1 the non-Newtonian behaviour of certain visco-elastic materials, including rubber solutions and soap-thickened mineral oils, was discussed. Experiment had shown that when such liquids flow through a capillary there is a loss in pressure at the tube entrance followed by a uniform fall in pressure down the remainder of the tube. This loss was shown to be large, particularly at high stresses, and if expressed in the form of an end 'correction', sometimes amounted to as much as fifty diameters. The effect was attributed in a general way to the elastic nature of the material since it did not occur in Newtonian liquids or solid-liquid suspensions. In addition, this 'elastic end effect', as it was termed, was found to be related to the recovery or swelling of the column of liquid issuing from the capillary.
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Merrington, A. C., Nature, 152, 663 (1943).
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MERRINGTON, A. Elastic Recovery in Capillary Flow. Nature 155, 669 (1945). https://doi.org/10.1038/155669a0
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DOI: https://doi.org/10.1038/155669a0
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