Abstract
Viscoelastic flows are common in many natural and industrial applications, such as biofilm transport, drug delivery, and enhanced oil recovery. The stretching of polymeric chains in viscoelastic flows induces elastic instability, which manifests in symmetry-breaking, time-dependent flows, and anomalous transport properties. The knowledge of the polymeric stress field is essential for understanding transport in viscoelastic flows because the topology of the polymeric stress field controls the flow states and dynamics in viscoelastic flows. However, the experimental measurements of the stress field are challenging. Through analytical and numerical analyses, we obtain a relationship between the polymeric stress field and the Lagrangian stretching field. The Lagrangian stretching field depends solely on the flow kinematics, which is relatively easy to measure in the experiment. Thus, our result establishes a simple framework to unveil the topology of the polymeric stress field directly from readily measurable flow field data, even for strongly viscoelastic and unstable flows.
About the Speaker
Arezoo Ardekani is a Professor of Mechanical Engineering at Purdue University. Honored with the Presidential Early Career Award for Scientists and Engineers (PECASE) from President Obama, Arezoo has also received an NSF CAREER Award, the Arthur B. Metzner Early Career Award from the Society of Rheology, the Society of Engineering Science (SES) Young Investigator Medal, the Sigma Xi Mid-career Research Award, and is named a Purdue University Faculty Scholar. A Fellow of the American Physical Society (APS) and American Society of Mechanical Engineers, Arezoo has also received the College of Engineering Faculty Excellence Awards for Graduate Student Mentorship and Early Career Research, the Amelia Earhart Award, and the Society of Women Engineers Award. She received her Ph.D. from the University of California Irvine in 2009 and was a Shapiro Postdoctoral Fellow at MIT. Her research focuses on the suspensions of particles, swimmers, and drops, as well as complex fluids. Arezoo has published 150 articles in leading journals and presented 75 invited/keynote talks. Arezoo is an Associate Editor of ASME Applied Mechanics Review, an Editorial Advisory Board Member of the International Journal of Multiphase Flow, Journal of Non-Newtonian Fluid Mechanics, Physics of Fluids and Physical Review Fluids and a member of the American Physical Society-Division of Fluid Dynamics (DFD) Executive Committee. She was a co-chair of the 2022 APS-DFD meeting held in Indianapolis.
Host: Professor Jie Feng
