Plenary, Monday, July 13, 2020
Howard Alvin Stone
Donald R. Dixon '69 and Elizabeth W. Dixon Professor in Mechanical and Aerospace Engineering
Title: Seeking Intersections Between Disciplines: “Boundaries” in Multiphase Flows
Abstract: Fluid mechanics has a rich history. Modern research themes introduce new questions, some of which can be understood using fundamental concepts. This feature is sometimes the case in the flows of complex fluids, which link fundamental research questions to potential applications, both in industry and for understanding natural phenomena. In this talk I will survey four research questions that we have studied in recent years that have this character:
(1) I will document the time and (three-dimensional) space variations of the shape of a falling film near an edge, and rationalize the quantitative features using a similarity scaling with a unique feature that takes a three-dimensional problem and converts it to a one-dimensional problem. (2) Although flows at modest Reynolds numbers at a T-shaped junction is a geometry where one should expect everything is known, nevertheless we uncover previously unrecognized complexity in three-dimensional solutions to the Navier-Stokes equations, which rationalize our experimental observations of particle trapping in this common flow configuration. (3) The motion of a particle adjacent to a flexible membrane links fluid and elastic responses, which we show produces interactions capable of separating particles by size. (4) If there is time, I illustrate our work rationalizing patterns naturally formed in a café latte by linking the observations to the well-known oceanographic phenomenon of double-diffusive convection.
Bio: Professor Howard A. Stone received the Bachelor of Science degree in Chemical Engineering from the University of California at Davis in 1982 and the PhD in Chemical Engineering from Caltech in 1988. Following a postdoctoral year in the Department of Applied Mathematics and Theoretical Physics at the University of Cambridge, in 1989 he joined the faculty of the (now) School of Engineering and Applied Sciences at Harvard University, where he eventually became the Vicky Joseph Professor of Engineering and Applied Mathematics. In 1994 Professor Stone received both the Joseph R. Levenson Memorial Award and the Phi Beta Kappa teaching Prize, which are the only two teaching awards given to faculty in Harvard College. In 2000 he was named a Harvard College Professor for his contributions to undergraduate education. In July 2009 he moved to Princeton University where he is Donald R. Dixon ’69 and Elizabeth W. Dixon Professor in Mechanical and Aerospace Engineering.
Professor Stone's research interests are in fluid dynamics, especially as they arise in research and applications at the interface of engineering, chemistry, physics, and biology. In particular, he developed original research directions, using experiments, theory and simulations, in microfluidics, multiphase flows, electrokinetics, flows involving bacteria and biofilms, etc. He received the NSF Presidential Young Investigator Award, is a Fellow of the American Physical Society (APS), and is past Chair of the Division of Fluid Dynamics of the APS. For ten years he served as an Associate Editor for the Journal of Fluid Mechanics, and is currently on the editorial or advisory boards of Physical Review Fluids, Philosophical Transactions of the Royal Society, and Soft Matter, and is co-editor of the Soft Matter Book Series. Professor Stone is the first recipient of the G.K. Batchelor Prize in Fluid Dynamics, which was awarded in August 2008, and the 2016 recipient of the Fluid Dynamics Prize of the APS. He was elected to the National Academy of Engineering in 2009, the American Academy of Arts and Sciences in 2011 and the National Academy of Sciences in 2014.
Plenary, Wednesday, July 15, 2020
2018 ASME Fluids Engineering Awardee
Provost and Senior Vice-President Mechanical Engineering
Title: From Reduced Turbulence Models of Turbulence to Microfluidics
Abstract: In this talk, I will review the derivation of reduced models of turbulence and its application to the wall region of the turbulent boundary layer. I will also summarize the further development of the Proper Orthogonal Decomposition (POD) and its variants for extracting salient features from complex spatio-temporal data. Turning my attention to the field of microfluidics, I will present simple solutions to the mixing of fluids and the manipulation of suspended particles in microscale channels, two crucial phenomena for the design of efficient microfluidic devices.
Bio: Dr. Nadine Aubry is provost and senior vice president, and a professor of mechanical engineering, at Tufts University. She has made research contributions to fluids engineering, including low-dimensional models of turbulent flows and novel microfluidics methods and devices. She has been elected to the National Academy of Engineering (NAE), American Academy of Arts and Sciences, National Academy of Inventors and American Academy of Mechanics, and is a fellow of the American Association for the Advancement of Science, American Institute of Aeronautics and Astronautics (AIAA), American Physical Society (APS), and American Society of Mechanical Engineers (ASME). She was awarded the G.I. Taylor Medal of the Society of Engineering Science, the ASME Fluids Engineering award and the AIAA Fluid Dynamics award. She currently serves as president of the International Union of Theoretical and Applied Mechanics, chair of the NAE mechanical engineering section, and past chair of the NAE Bernard M. Gordon Prize for Innovation in Engineering and Technology Education selection committee, and is a previous chair of the APS Division of Fluid Dynamics and the U.S. National Committee on Theoretical and Applied Mechanics. Prior to joining Tufts, she served as dean of engineering and university distinguished professor at Northeastern, and head of mechanical engineering, Lane distinguished professor and university professor at Carnegie Mellon. She holds a Diplôme d’Ingenieur from Institut National Polytechnique Grenoble, France, and a Diplome d’Etudes Approfondies from Université Grenoble Alpes, both in mechanical engineering (1984), and a Ph.D. from the Sibley School of Mechanical and Aerospace Engineering at Cornell (1987).
Plenaries on Tuesday and Thursday, July 14 and 16, 2020
ASME 2019 Henry R. Worthington Medal Recipient for eminent achievement in the field of pumping machinery, systems and concepts established by Worthington Pump, Inc. and ASME 2019 Fluids Engineering Awardee for outstanding contributions to research, practice and/or teaching.