Aeration and Foaming in Lubricating Oil Systems: A Study of Oil Aeration and the Fundamentals of the Foaming Process, with Particular Reference to the Aero‐engine

DESPITE the quite extensive literature on foam, the mechanism of its formation and decay does not appear to be widely appreciated. Most fundamental research has been orientated towards maximum foam in aqueous solutions, whereas the desire in aircraft engines is for minimum foam in oil ‘solutions’. Further, the numerical results obtained experimentally depend on the details of experimental procedure, which makes correlation of existing data very uncertain.