451196 Dynamic Contact Angles in Liquid-Liquid Systems

Sunday, November 13, 2016: 5:00 PM
Union Square 23 & 24 (Hilton San Francisco Union Square)
Amer Al-Shareef, Chemical and Biochemical Engineering, Missouri S&T, Rolla, MO and Parthasakha Neogi, Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO

When a plate is withdrawn or inserted through a liquid-liquid interface, the additional forced required due to surface effects, is measured and reported in form of a dynamic contact angle. In the first set of experiments the case of water advancing into very viscous oils is shown to have dynamic contact angles somewhat larger than the equilibrium values. In the receding case, the meniscus is seen to be unstable.  In the second set, water is replaced with an aqueous polymer (PEO) solution. Significant changes in contact angles are observed but with no obvious signs of shear thinning effects of polymer solutions.  The receding contact lines are unstable but at higher velocities, with probably an increased effect due to elastic recoil.

Extended Abstract: File Not Uploaded
See more of this Session: Interfacial Transport Phenomena
See more of this Group/Topical: Engineering Sciences and Fundamentals