Abstract
Foaming in liquids is ubiquitous in nature. Whereas the mechanism of foaming in aqueous systems has been thoroughly studied, nonaqueous systems have not enjoyed the same level of examination. Here we study the mechanism of foaming in a widely used class of nonaqueous liquids: lubricant base oils. Using a newly developed experimental technique, we show that the stability of lubricant foams can be evaluated at the level of single bubbles. The results obtained with this single-bubble technique indicate that solutocapillary flows are central to lubricant foam stabilization. These solutocapillary flows are shown to originate from the differential evaporation of multicomponent lubricants—an unexpected result given the low volatility of nonaqueous liquids. Further, we show that mixing of some combinations of different lubricant base oils, a common practice in the industry, exacerbates solutocapillary flows and hence leads to increased foaming.
Publisher
Proceedings of the National Academy of Sciences
Reference31 articles.
1. Dynamic fluid-film interferometry as a predictor of bulk foam properties;Frostad;Soft Matter,2016
2. Garrett PR (2016) The Science of Defoaming: Theory, Experiment and Applications (CRC, Boca Raton, FL), Vol 155.
3. Pugh RJ (2016) Bubble and Foam Chemistry (Cambridge Univ Press, Cambridge, UK).
4. Non-aqueous foams in lubricating oil systems;Binks;Colloids Surf A Physicochem Eng Asp,2010
5. Sheng S (2014) Gearbox typical failure modes, detection and mitigation methods (National Renewable Energy Laboratory, Golden, CO).
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