(349c) Understanding Beer Foam with Dynamic Fluid-Film Interferometry
AIChE Annual Meeting
Tuesday, November 15, 2016 - 1:00pm to 1:15pm
In the present work, dynamic fluid-film interferometry is utilized to study the time evolution of films captured between a single bubble and the (initially) planar air/solution interface. This technique can be used to track the topological features of the film as a function of time, from which the dynamics of drainage can be quantified. Some of the metrics presented here include the radial extent of the film, the total volume of the film, and the maximum, minimum, and mean film thicknesses. These data are then compared to the dynamic evolution of complete foams formed by sparging air bubbles into a small volume of liquid. Results will be presented for simple surfactant solutions, as well as a range of beers, with the goal of enabling the prediction and/or control of foam characteristics by tuning the properties of the air/solution interface.