Page 41 - ASME IMECE 2018 Program
P. 41
TRACK PLENARY
Bio: Ahmed Ghoniem the Ronald C. Crane extensional kinematics and large fluid strains. Local
Professor of Mechanical Engineering, Director birefringence measurements along the stagnation streamlines,
of the Center for Energy and Propulsion combined with bulk measurements of the excess pressure
Research and the Reacting Gas Dynamics drop across the device, provide self-consistent estimates of
Laboratory at MIT. He received his B.Sc. and the extensional viscosity over a wide range of deformation
M.Sc. degree from Cairo University, and Ph.D. rates up to 1000 s–1. The results are also in close agreement
at the University of California, Berkeley. His research covers with numerical simulations based on a finitely extensible
computational engineering with application to turbulence and nonlinear elastic (FENE) dumbbell model. As the imposed
combustion, multiphase flow and multiscale phenomena, extension rate in the OSCER device is increased, the
clean energy technologies with focus on CO2 capture, homogeneous planar elongational flow ultimately becomes
renewable energy and alternative fuels. His research has unstable. High-frame rate video-imaging of the birefringence
made fundamental contributions to multiscale simulations, field is used to construct space-time diagrams of the evolution
thermochemistry, combustion dynamics, energy systems and in the flow for seven different polymer solutions and to
materials chemistry. He supervised more than 100 M.Sc., Ph.D. construct the first stability diagram for planar extensional flows
and post-doctoral students, many are leaders in academia, in cross-slot devices. The mode of instability is found to
industry and governments; published more than 500 refereed depend on the elasticity number (El = Wi/Re) of the fluid, with a
articles in leading journals and conferences; lectured steady symmetry-breaking purely-elastic bifurcation observed
extensively around the World; and consulted for the aerospace, at high El >> 1, and time-dependent three-dimensional inertio-
automotive and energy industry. He is fellow of the American elastic instabilities dominant for El < 1.
Society of Mechanical Engineer (ASME), the American institute
of Physics (APS), the Combustion Institute (CI), and associate Bio: Gareth H. McKinley is the School of
fellow of the American Institute of Aeronautics and Engineering Professor of Teaching Innovation
Astronautics (AIAA). He received several prestigious awards within the Department of Mechanical
including the ASME James Harry Potter Award in Engineering at MIT. He received his B.A. and
Thermodynamics, the AIAA Propellant and Combustion Award, M.Eng. from the University of Cambridge and
the KAUST Investigator Award and the Committed to his Ph.D. (1991) from the Chemical
“Committed to Caring Professor” at MIT. Engineering Department at MIT. He taught in the Division of
Engineering and Applied Sciences at Harvard from 1991 to
Track 9: Fluids 1997 and was an NSF Presidential Faculty Fellow from 1995 to
1997. He won the Annual Award of the British Society of
9-17-1: FLUIDS ENGINEERING PLENARY I Rheology in 1995 and the Frenkiel Award from the APS Division
of Fluid Dynamics in 2001. He served as Executive Editor of
Tuesday, November 13, 8:00am–8:45am the Journal of Non-Newtonian Fluid Mechanics from 1999 to
Room 301, David L. Lawrence Convention Center 2009 and as Associate Editor of the Journal of Fluid Mechanics
from 2007 to 2009. He most recently served as the Associate
Microfluidic Rheometry of Complex Fluids Department Head for Research of the Mechanical Engineering
(IMECE2018-90100) Department at MIT from 2008 to 2013. He is also a co-founder
of Cambridge Polymer Group. His research interests include
Gareth H. McKinley extensional rheology of complex fluids, non-Newtonian fluid
MIT dynamics, microrheology and microfluidics, field-responsive
fluids, super-hydrophobicity, wetting of nanostructured
Abstract: The development and growth of microfluidics has surfaces, and the development of nanocomposite materials.
stimulated interest in the behavior of complex liquids in He is the author of over 275 technical publications and was
microscale geometries and provided a rich platform for one of the winners of the 2007 Publication Award of the
rheometric investigations of non-Newtonian material Society of Rheology. He is a Fellow of the American Physical
phenomena at small scales. Microfluidic techniques present Society and President of the U.S. National Committee of
the rheologist with new opportunities for measurement of fluid Theoretical and Applied Mechanics (USNC/TAM). He was the
properties and enable the systematic investigation of strong recipient of the 2013 Bingham Medal of the Society of
elastic effects at very high deformation rates without the Rheology and served as President of the Society from 2015 to
complications of fluid inertia. In this presentation, we provide 2017. Most recently, he won the 2014 Gold Medal of the British
an overview of the use of microfluidic devices to measure bulk Society of Rheology.
rheology and onset of viscoelastic flow instabilities in both
shear and extensional flows, using a combination of local xxxix
velocimetric imaging, mechanical measurements of pressure
drop, and full-field optical probes of flow-induced
birefringence. Steady and time-dependent flows of a range of
dilute polymer solutions and wormlike micellar fluids are
considered. The ability to rapidly and precisely fabricate
complex flow geometries also enables us to exploit the
predictions of computational optimization and design, from first
principles, an optimized shape cross-slot extensional
rheometer (or OSCER) that achieves homogeneous planar
