(400c) Foaming Performance of Anti-Foam Laden Lubricants Subject to Filtration
AIChE Annual Meeting
2019 AIChE Annual Meeting
Engineering Sciences and Fundamentals
Emulsions and Foams
Tuesday, November 12, 2019 - 4:00pm to 4:15pm
Here we study this phenomenon in detail by probing the coalescence stability of single bubbles in filtered lubricants with organo-modified siloxane (liquid) antifoams. From the bubble results we show that lubricant foam stability is directly correlated to the filtration cycles, and inversely correlated to both the filter pore size and the antifoam concentration. In addition, we will also propose a method utilizing the single bubble stability to gain an approximate understanding of the underlying antifoam size density distributions. Finally, utilizing a simple probabilistic model, we will also establish a necessary (but not sufficient) condition on the minimum antifoam concentration required in a lubricant for maintaining satisfactory foaming performance. We believe these results are valuable in guiding the design of lubricants with robust and superior foaming performance.