Seminar Announcement, 05/03/2016
Levich Institute Seminar Announcement, 05/03/2016
Tuesday, 05/03/2016
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Jeffrey Giacomin
Queen's University
Department of Chemical Engineering
Kingston, Ontario, Canada

"Advances in Large-Amplitude Oscillatory Shear Flow of Polymeric Liquids"

ABSTRACT


In 1935, Andrew Gemant conceived of the complex viscosity, a rheological material function measured by "jiggling" an elastic liquid in oscillatory shear [Rheol. Acta, 51, 481 (2012)]. This test reveals information about both the viscous and elastic properties of the liquid, and about how these properties depend on frequency. The test gained popularity with chemists when John Ferry perfected instruments for measuring both the real and imaginary parts of the complex viscosity [“Ferry 1912-2002 …,” Mem. Trib., NAE, 17, 96 (2013)]. In 1958, Cox and Merz discovered that the steady shear viscosity curve was easily deduced from the magnitude of the complex viscosity, and today small-amplitude oscillatory shear is the single most popular rheological property measurement.

With oscillatory shear, we can control two things: the frequency (Deborah number) and the shear rate amplitude (Weissenberg number). When the shear rate amplitude is large, the elastic liquids respond with a shear stress over a series of odd-multiples of the test frequency. In this lecture we will explore how this shear stress response is measured, and we will examine both continuum (corotational models [JNNFM, 166, 1081 (2011)]) and molecular (rigid dumbbells) approaches to interpreting large-amplitude oscillatory shear measurements. We consider these models to be the simplest relevant continuum and molecular models. We will also explore the normal stress response [Rheol. Acta, 50, 741 (2011)], and the fluid temperature rise [I&ECR, 52, 2008 (2013)] in large-amplitude oscillatory shear flow.

BRIEF ACADEMIC/EMPLOYMENT HISTORY

Born in Kingston, Canada, Alan Jeffrey Giacomin completed high school in Pointe Claire, Québec before earning his bachelors and masters degrees in Chemical Engineering at Queen’s University in Kingston, and then his PhD in Chemical Engineering at McGill. He has held faculty positions at Texas A&M and the University of Wisconsin-Madison, where for 20 years, he directed the Rheology Research Center. Giacomin serves as Editor-in-Chief of Physics of Fluids, Associate Editor for Business of the Journal of Rheology, and serves on the Board of Managers of the American Institute of Physics Publishing. Giacomin was named Professeur de l’Académie des Sciences by the Institut de France, and is an Honorary Associate of the University of Wales Institute of Non-Newtonian Fluid Mechanics. Giacomin has held visiting professorships in Canada, Switzerland, France, Singapore, Taiwan and China. Giacomin is a registered Professional Engineer in Wisconsin and Ontario, and is a former President of The Society of Rheology. At Queen’s, Giacomin is Professor of Chemical Engineering, jointly appointed in Mechanical and Materials Engineering, and holds the title of NSERC Canada Research Chair in Rheology

RECENT RESEARCH INTERESTS

Rheology and its role in polymer processing. Structure-property relations for polymeric liquids.



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