Lubricant Aeration Testing to Determine Gas Entrainment Level in Oils
Aeration properties of lubricating oils
DEFINITION: Aeration or entrained air is a natural characteristic of an oil to retain free air above the absorption limit
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- Oil aeration is an important property of oil for good mechanical operation, it impairs mechanical performance because of:
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- Cavitation in components and wear by irregular (potholed) oil film
- Oil compressibility (“sponginess”) affects response in hydraulically driven component operation
- Oxidation reactions in a larger area of contact with oxygen and pressure cycles affects drain cycle and deposit/varnish formation
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- Oil aeration is an important property of oil for good mechanical operation, it impairs mechanical performance because of:
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- Previous test methods for aeration testing:
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- ASTM D-8047 Engine oil aeration resistance in CAT C13 heavy-duty diesel engine. COAT replaces D6894 as part of the PC-11
- Air release ASTM D-3427 and foaming ASTM D-892 are not the eye of the storm of air/oil interaction in performance drivetrain components
- ISO 12152 Flender foaming test, stops test to measure increased volume in a ruler
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- Previous test methods for aeration testing:
New test method to measure Oil Aeration
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- Measures dynamic gas holdup in lubricating oils
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- Principle of operation/test description
- Aeration by simulation of a air vortex into the oil
- Principle of operation/test description
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- Aeration measured in steady agitation
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- 700 ml test fluid; Sample heating (25°C – 120°C temperature control), time 30 minutes
- Turbine mixer develops vortex action to entrain air, Peristaltic pump moves a slipstream to test cell
- OILPAS Optical imaging device measures bubbles in the test cell
- The OILPAS algorithm evaluates online the dispersed gas ratio % in oil
- Deaeration measured in time to release and speed of release
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- Aeration measured in steady agitation
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- Repeatability demonstrated
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