Synonyms
Definition
A high-pressure viscometer is an instrument for the measurement of the shear viscosity at pressure significantly greater than atmospheric pressure so that the pressure dependence may be accurately determined. Shear viscosity, \( \eta \), as opposed to extensional viscosity or bulk viscosity, is the ratio of a shear stress, \( \tau \), acting upon a plane divided by the gradient, \( \dot{\gamma } \), normal to the plane of the component of velocity in the direction of the shear stress. The limiting low shear viscosity,\( \ \mu \), is the value of \( \eta \) that is approached as the stress or rate go to zero. The term rheometer is sometimes used to describe a viscometer that measures shear-dependent viscosity and is at other times reserved for an instrument that can measure other manifestations of non-Newtonian response.
Scientific Fundamentals
Viscosity
The one property of the fluid lubricant that must always appear in the...
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References
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Bair, S. (2013). High Pressure Viscometers. In: Wang, Q.J., Chung, YW. (eds) Encyclopedia of Tribology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-92897-5_600
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DOI: https://doi.org/10.1007/978-0-387-92897-5_600
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