(444c) Coalescence of Drops Due to a Constant Force Interaction in a Viscous Quiescent Fluid
AIChE Annual Meeting
2017
2017 Annual Meeting
Engineering Sciences and Fundamentals
Particulate and Multiphase Flows: Dynamics of Emulsions, Bubbles, Droplets
Tuesday, October 31, 2017 - 3:45pm to 4:00pm
A Cantilevered-Capillary Force Apparatus is used to study the time scale for the coalescence of two droplets compressed together with a constant force. Power-law trends for the coalescence time as a function of droplet radius and compression force are measured. The measurements are compared against several different scaling theories from the literature. One of the existing theories is found to correctly predict the dependence on the droplet radius, but all of the theories over-predict the dependence on the force. A transition is also measured in the coalescence process from a predominately deterministic to a predominately stochastic process. A qualitative explanation for this transition is provided via scaling arguments.