Abstract
Rheometers able to measure non-Newtonian properties must induce the same stress and the same shear rate in the whole volume of the test liquid. Otherwise some kind of mean value of the shear stress-shear strain rate relationship will be measured by the instrument. The stresses induced in the liquid must also be maintained without introducing a disturbing heat generation in the fluid. This means that the shear stress multiplied by the shear strain rate must not be so large that any considerable temperature increase takes place. Normal mineral oil based lubricants lose typically half their viscosity when the temperature is increased by 15 °C, so the temperature variation allowed in the viscometer during a measurement is only a fraction of a degree if any reasonable accuracy should be expected.
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Jacobson, B. (2000). Lubrication. In: Jacobson, B., Kalker, J.J. (eds) Rolling Contact Phenomena. International Centre for Mechanical Sciences, vol 411. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2782-7_7
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DOI: https://doi.org/10.1007/978-3-7091-2782-7_7
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