Abstract
WHEN a capillary-tube viscometer is used for determining the apparent viscosity of a suspension of discrete, solid particles in a liquid, it is found that the measured viscosity varies with the bore of the capillary, increasing with increasing diameter. This effect, termed the sigma phenomenon, has been investigated by several workers, but in particular by Vand1 and de Bruijn2, both of whom examined the rheological properties of suspensions of spherical glass particles in liquids inert to glass.
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References
Vand, V., J. Phys. Coll. Chem., 52, 277 (1948).
De Bruijn, H., paper presented at a joint meeting of the Chemical Society and the British Rheologists Club, May 1949. For report of meeting, see Nature, 164, 220 (1949).
Dix, A., and Scott Blair, G. W., J. App. Phys., 11, 574 (1940).
Whitmore, R. L., and Ward, S. G., Brit. J. App. Phys., 1, 286 (1950).
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EVESON, G., WHITMORE, R. & WARD, S. Use of Coaxial-Cylinder Viscometers and Capillary-Tube Viscometers for Suspensions. Nature 166, 1074 (1950). https://doi.org/10.1038/1661074a0
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DOI: https://doi.org/10.1038/1661074a0
