Lubricant Foaming and Aeration Study. Part 2.
Abstract
This investigation is directed toward obtaining a fundamental understanding of lubricant foaming and aeration. On the practical side, foam tests showed that the surface activity of additives varies from one production batch to another, requiring continuing testing before acceptance. On the fundamental side, three independent techniques were developed to measure dynamic (nonequilibrium) surface tensions of oils containing additives, to obtain simpler correlative physical properties of oil surfaces than the complex multivariant effects that underlie the phenomena of foaming and aeration. These techniques to detect and measure dynamic surface tensions are: measuring changes of surface tension on cycling area contractions and expansions; measuring the damping of capillary ripples; and measuring the rate of ascent of a single bubble in an oil solution. These techniques are able to disclose the presence of surface activity in oil solutions, even before it develops to the state of an overt foam problem. Keywords: Foam Bubble Rise; Surface Elasticity; Surface Tension; Dynamic Surface Tension; Capillary-wave Damping.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA163696
Entities
People
- Sydney Ross
Organizations
- Rensselaer Polytechnic Institute