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控制应力流变仪在润滑油表征中的应用
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| Determination of the rheological or flow properties of greases under a variety of shear conditions is important for predicting the greases’ suitability for specific end-uses. An instrument called the Lincoln Ventmeter is often used for evaluating the flow properties of greases. That device is based on a pressurized (typical pressure 12,400 kPa) capillary which gives an index of pumpability by measuring the pressure drop across a specific distance. Although the measurement is controlled stress in nature, the shear rate in the device is not constant for the entire sample during measurement because the capillary measurement geometry has a parabolic velocity profile with the shear rate approaching zero at the centerline of the tube and a maximum at the tube wall. Hence, calculation of a relative or absolute viscosity from the experimental results is difficult. |
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2016-07-04 15:24:59, 267.69 K
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