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The design and operation of a high-shear rotational viscometer which has been the subject of several technical papers are discussed. This instrument produces shear rates up to 1,000,000 reciprocal seconds. Measurements on straight mineral and polymer-thickened oils are presented. Interpretation of data is discussed. Both reversible and irreversible viscosity losses are noted. Operation of the instrument is limited by heat transfer from the rotor and stator. Methods are developed for estimating operating temperatures preliminary to actual testing. Several operating variables found to affect results are discussed. The recommendation is made to calibrate the viscometer carefully under the same conditions to be experienced by the test fluid.
Bonner, F. J.
University of Delaware, Newark, Del
Gyer, J. F.
Socony Mobil Oil Co., Inc., Paulsboro, N. J.