Cavitation Of Multigrade Oils Under Dynamic Stressing At Elevated
Temperatures
Author(s)
P.R. Williams & R.L. Williams
Abstract
Cavitation of multigrade oils under dynamic
stressing at elevated temperatures
P.R. Williams & R.L. Williams
Centre for Complex Fluids Processing, School of Engineering,
University of Wales, UK
Abstract
In many flow situations, 1 iquids which are subjected to negative pressures ( or
'tension') also experience a range of temperatures. In typical organic liquids,
homogeneous nucleation theory predicts that the cavitation threshold or effective
tensile strength of a liquid, F, , decreases with increasing temperature by ca. 1
barI0C. But in the case of common engineering liquids such as lubricants,
cavitation is likely to involve heterogeneous nucleation due to the availability of
nuclei for bubble growth. This being the case, it is necessary to measure F, under
pertinent conditions. This paper reports a technique which permits measurements
of the effective tensile strength, F,, of degassed samples of a commercial
'multigrade' engine oil over a range of temperatures, T, representative of those
enc
Keywords
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