Levich Institute Seminar Announcement, 04/28/2009
Steinman Hall, Room #312
(Chemical Engineering Conference Room)
Professor G. Paul Neitzel
Georgia Institute of Technology
School of Mechanical Engineering
"Permanent Noncoalescence and Nonwetting: Science and Applications "
Under the proper conditions it is possible to press together two drops of the same liquid without experiencing coalescence or to press a liquid droplet against a surface normally wetted by the liquid without wetting occurring. By permanent noncoalescence and nonwetting we distinguish cases in which the phenomena may be observed for unlimited time from transient examples such as two drops of liquid bouncing off one another or a liquid droplet bouncing off a solid wall. To achieve permanent noncoalescence or nonwetting, a mechanism is needed for establishing a lubricating film of surrounding fluid (usually air) and sustaining this film as the liquid/liquid or solid/liquid surfaces are moved toward each other.
This talk will address means for the establishment of such lubricating films and discuss measurements and theory conducted to understand the behavior of such
systems. Finally, possible applications of permanent noncoalescence and nonwetting will be described, including a demonstration of droplet levitation above a solid surface using non-contact, optical
Hydrodynamic stability of unsteady swirling flows and flows associated with materials processing,
vortex breakdown, suppression of coalescence/wetting and bioreactor fluid dynamics.