Start
Mar 04, 2010 - 16:00
End
Mar 04, 2010 - 17:30
Venue
Room No 118 (Creativity Hall)
Event Type
Speaker
Prof. Nivedita R. Gupta Department of Chemical Engineering University of New Hampshire Durham NH US
Title
Drops Rising in Channels
Abstract: Drops and bubbles in confined domains are encountered in a variety of applications such as oil recovery solvent extraction and paper-making. In this talk I will present our experimental as well as numerical results for the steady shape and mobility of viscous drops and bubbles rising in cylindrical and square channels. The effects of Bond number Weber number and the presence of surfactants on the steady shapes and terminal velocities of the drops and bubbles are explored. As the Bond number increases drops become more deformed. At higher Weber numbers a reentrant cavity is found at the rear of the drop. Surfactants when present at low concentrations retard the motion of the drops by generating Marangoni stresses that oppose the motion of the drops. When the surfactant concentration is increased the bubbles can be remobilized.Biography: Dr. Nivedita Gupta is an Associate Professor in the Department of Chemical Engineering at the University of New Hampshire. She received a B. Tech. in Chemical Engineering from IIT Bombay in 1993 and Ph.D. in Chemical Engineering from Pennsylvania State University in 1999. Dr. Gupta joined the University of New Hampshire in 2002 after completing postdoctoral research at Johns Hopkins University. Her research interests include interfacial flows surfactants effects and microfluidics.Event is FullRegistration is closed.