Lubricant Foaming and Aeration Study. Part 1
Final rept. 1 Sep 1980-31 Aug 1983
RENSSELAER POLYTECHNIC INST TROY NY
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This research is directed toward the investigation of the mechanisms associated with lubricant foaming and aeration. Theories of the cause of foaming were reviewed, for the purpose of testing the applicability of suggested mechanisms to the present problem. The experimental studies were of basestock ester and ester-additive systems. The foaming of these systems was investigated with respect to the following variables or conditions temperature viscosity of the bulk liquid viscosity of the surface layer solubility of additives mixtures of additives surface-tension lowering at equilibrium surface-tension changes on expansion or contraction of surface rate of gas injection gas solubility geometrical shape of the foam container and electrical properties. Results obtained demonstrate that total additive concentration and synergistic effects of additives are important variables, either affecting the surface tension under dynamic conditions, or promoting electrical surface potentials, both of which effects conduce to the foaminess of ester solutions.
- Lubricants and Hydraulic Fluids