This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Transportation and Transformation of Air Bubbles in Aerated Oil through an Engine Lubrication System
Technical Paper
2004-01-2915
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The amount of free air in an engine oil can affect the performance of some engine components. Part of the air in an aerated oil can be dissolved into the oil, while some may remain as free air when the oil reaches these components. A methodology of analyzing how much air dissolves into the oil and how much remains as free air in a lubrication system is presented. A V6 gasoline engine is used as an example to calculate the changes of air bubble sizes due to compression and dissolution into the oil. The amount of air dissolved and the amount of free air in the oil when it reaches various locations along the lubrication passageways are estimated. It is concluded in the case studied that small air bubbles will be dissolved entirely before the oil reaches oil galleries in the heads, while most air in large air bubbles will stay as free air.
Recommended Content
Technical Paper | Effect of Oil Aeration Rate on the Minimum Oil Film Thickness and Reliability of Engine Bearing |
Technical Paper | Connecting Rod Bearing Operation with Aerated Lube Oil |
Technical Paper | High-speed Video Observation of Engine Oil Aeration |
Authors
Topic
Citation
Ni, B. and Pieprzak, J., "Transportation and Transformation of Air Bubbles in Aerated Oil through an Engine Lubrication System," SAE Technical Paper 2004-01-2915, 2004, https://doi.org/10.4271/2004-01-2915.Also In
References
- Kubo, K. Lillywhite, J. Automotive Lubricant (Part 1) J. Japanese Society of Tribologists 1994 39 1 51
- Nemoto, S Kawata, K. Kuribayashi, T. Akiyama, K. Kawai, H. Murakawa, K. A Study of Engine Oil Aeration JSAE Review 1997 18 271 276
- Koch, F. Hardt, T. Haubner, F. Oil Aeration in Combustion Engines - Analysis and Optimization SAE 2001-01-1074
- Nilolajsen, J. Viscosity and Density Models for Aerated Oil in Fluid-Film Bearings Tribology Transactions 1999 42 1 186 191
- Nikolajsen, J. The Effect of Aerated Oil on the Load Capacity of a Plain Journal Bearing Tribology Transactions 1999 42 1 58 62
- Chun, S. A Parametric Study on Bubbly Lubrication of High-Speed Journal Bearings Tribology International 2002 35 1 13
- Hass, A. Geiger, U. Maaben, F. Oil Aeration in High Speed Combustion Engines SAE 940792
- Maassen, F. Koch, F. Pischinger, F. Connecting Rod Bearing Operation with Aerated Lube Oil SAE 981404
- Choi, J. K. Min, B. Han, D. Effect of Oil Aeration Rate on the Minimum Oil Film Thickness and Reliability of Engine Bearing SAE 932785
- Choi, J. K. Min, B. Han, D. The Effect of Oil Aeration on the Reliability of Engine Bearings during High Speed Cornering Conditions SAE 945044
- Menzel, O. Hamann, W. 1985
- Katakura, H. Tsuji, S. Yamane, R. Fujita, H. A Research on Air in Oils Bulletin of JSME 1984 27 231
- Epstein, P. Plesset, M. On the Stability of Gas Bubbles in Liquid-Gas Solutions J. of Chemical Physics 1985 18 11
- Porot, P. Trapy, J. A Numerical and Experimental Study of the Effect of Aeration of Oil on Valve Trains Equipped with Hydraulic Lash Adjusters SAE 930997