JonathanP. Rothstein Dept.of MechanicalEngineering Room 3-259, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139-4307 Ph: 617.253.0273 FAX: 617.258.8559 jproth@mit.edu |
Jonathan
Rothsteinwas born in 1974 in Hartford, Connecticut and spent the majority of
hisyouth growing up in Holliston, Massachusetts. He received his B.E.in
MechanicalEngineering from The Cooper Union
for theAdvancement of Science and Art in 1996. He began his
graduatestudieswith Prof. Gareth McKinley at
HarvardUniversity in the Department of
Engineering and Applied Science. Afterreceivinghis M.S. at Harvard in 1998 he followed Prof. McKinley to the FluidMechanicsLaboratory of MIT's Mechanical Engineering Department where he beganworkingtowards his Ph.D. in non-Newtonian fluid mechanics. His current researchfocuses on the characterization and analysis of the flow of highly elasticdilute polymer solutions through axisymmetric abrupt contraction-expansions.The aim of this research is to foster an understanding of the importantrolethat the extensional properties of polymeric fluids play in the dynamicsofcomplex flows. His other research interests include the rheology ofcomplexfluids, the effect of viscous heating on elastic flow instabilitiesand flowsinvolving self-assembling micelles. Peer-reviewed publications list: Rothstein, J.P. and McKinley,G.H., "The Axisymmetric Contraction-Expansion: The Role of Extensional Rheology on Vortex Growth Dynamics and the Enhanced Pressure Drop", J.Non-Newtonian Fluid Mech., (2000) Submitted. GHM50.pdf(522 KB) Abstract Rothstein, J.P. and McKinley,G.H., "Non-Isothermal Modifications of Purely Elastic Flow Instabilities in Torsional Flows of Polymeric Fluids". Phys. Fluids., (2000), Submitted. GHM46.pdf (306 KB) Rothstein, J.P.and McKinley,G.H., "Extensional Flow of a Polystyrene Boger Fluid Througha 4:1:4Axisymmetric Contraction/Expansion", J. Non-Newt. Fluid Mech. ,86,(1999), 61-88. GHM38.pdf (964KB)
The Asymmetric Contraction-Expansion
This image is apseudo streakimage of the flow of a highly elastic solution through an axisymmetric 4-1-4 contraction-expansion. The fluid is a 0.025wt% high molecular weight monodisperse polystyrene dissolved in an oligomeric polystyrene. To viewa movie showing the growth of the enhanced upstream vortex structure andthe onset of an elastic instability click on the follow clip. QuicktimeVideo (7.1MB) To view a movie of the elastic lip vortex upstream of a 2:1:2axisymmetric contraction-expansion using the same fluid click the followingclip. lip_vortex.avi Journal of Rheology 2001.wpd |