Measurement and Prediction of Viscosity-Pressure Characteristics of Liquids

[+] Author and Article Information
G. P. Fresco

Plastics Division, Allied Chemical Corporation, Philadelphia, Pa.

E. E. Klaus, E. J. Tewksbury

The Pennsylvania State University, University Park, Pa.

J. of Lubrication Tech 91(3), 451-457 (Jul 01, 1969) (7 pages) doi:10.1115/1.3554960 History: Received July 08, 1968; Online August 23, 2011


The successful application of a precision capillary-type pressure viscometer in the measurement of viscosity-pressure characteristics of a variety of fluids over the range of 0 to 10,000 psig is demonstrated. A number of pressure-viscosity values determined for about ten different chemical types of fluids provides the basis for the development of a graphical relationship involving the logarithm of viscosity, the pressure coefficient, and the viscosity temperature properties (ASTM slope) of the fluid. A second-degree polynomial equation in conjunction with a digital computer program allows one to calculate the pressure coefficient and, therefore, the viscosity values of fluids at 100 deg F and pressures up to 10,000 psig. The derivation of an exponent for the pressure coefficient extends the ability to calculate values over a range of temperatures. Primary data from three sources are used to compare and contrast these methods with those proposed by several other investigators.

Copyright © 1969 by ASME
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