Woodruff School of Mechanical Engineering

Title: Topological Behavior of Rotating Two-Fluid Interfaces Speaker: Prof. Yasushi Takeda Affiliation: Hokkaido University, Division of Energy and Environmental Systems When: Friday, November 20, 2009 at 1:00:00 PM Where: Love Building, Room 210 Host: Minami Yoda minami@gatech.edu 404 894 6838 Abstract The interface of two immiscible liquid layers contained in a rotating cylindrical tank shows interesting topological behavior during the initial transient (i.e., shortly after startup) as well as in a stationary state. The former case is driven by rotating the whole cylinder, while the latter appears when rotating the lid with a stationary container. For the latter case, the interfacial shape exhibits systematic change, varying with Reynolds number and the aspect ratio of the two layers. These results, along with our analysis of this phenomenon, will be presented (Fujimoto & Takeda, Phys. Rev. E 2009). The special case of a free-surface (i.e., a gas-liquid interface) will also be briefly discussed (Tasaka & Iima, J. Fluid Mech. 2009). Biography Dr. Yasushi Takeda received a Doctor of Engineering degree from Tohoku University and a Doctor of Science degree from Tokyo University. He has been a Professor at Hokkaido University since 2002 and is an internationally recognized expert in ultrasonic Doppler velocimetry. His research interests in experimental fluid mechanics include rotating flows, multiphase flows, and convection. Notes Refreshments will be served.