A New Kinetic Energy Correction for Capillary Tube Viscometers

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Abstract
The work of Caw and Wylie (1961) on viscometers with special capillary tubes of slowly varying radius has enabled the usual kinetic energy corrections to be reduced to a very small fraction of those with abrupt-ended capillaries. Thus one of the uncertainties in the use of such tubes is eliminated; also, the remaining small effect is rendered amenable to calculation (Tanner and Linnett 1965). It has been shown theoretically that the relation between viscosity and flow time is expected to be of the form

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