Tuesday, 04/27/2004
4:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Vladimir Entov
Institute for Problems in Mechanics of the Russian Academy of Sciences

"Dynamics and Breakup of Sheets, Jets and Filaments of Elastic Liquids"


Dynamic experiments with sheets, capillary jets, falling drops and thin filaments of elastoviscous fluids, such as solutions of polymers or surfactants, provide an unique opportunity to probe fluid behaviour under extremal circumstances. In these simple and easy-to-observe free-boundary flows dynamics and breakup are drastically modified by minute amounts of macromolecular substances. In jets and filaments these effects are caused by strong elongation of macromolecules along the axis and development of transient elastic stress that stabilizes liquid filament and prevents its fast rupture by capillary forces. Different manifestations of this basic mechanism are demonstrated, including new ones revealed by high-speed visualization experiments. Experimental observations are analyzed using one-dimensional dynamic theory, and it is shown that these experiments provide important information on elastic properties of macromolecules and their limiting behavior up to breakup. Some open issues are also discussed briefly, including proper statement of the problem of dynamics of a free jet breaking into drop and a liquid rupture problem and liquid rupture criteria.

The talk is based on collaborative studies with A.Bazilevsky, A.Rozhkov, A.Yarin, J.Hinch, J.Bico, C.Clasen and G.McKinley.

  • Moscow Gubkin Oil and Gas Institute (1959) MS in Mechanical Engineering;
  • Moscow State University, MS in Mathematics (1965)
  • Ph.D in Fluid Dynamics (Moscow Gubkin Oil and Gas Institute, 1964)
  • Dr.Sci in Fluid Dynamics (Institute for Problems in Mechanics RAS, 1972)
  • Institute of Mechanics, Moscow State U.,1964-71
  • Institute for Problems in Mechanics RAS, 1971-on as research associate, haed of the laboratory, leading scientist.
  • Professor of the Russian Gubkin State University of Oil and Gas, 1983-on
  • Leading Scientist - Scientific Supervisor of the Laboratory of Applied Continuum Mechanics, Institute for Problems in Mechanics of the Russian Academy of Sciences, Moscow;
  • Professor of Applied Mathematics of the Russian Gubkin State University of Oil and Gas, Moscow.
  • Member, Russian Academy of Natural Sciences
  • Member, Russian National Committee on Theoretical and Applied Mechanics
  • Member, Vinogradov's Rheological Society

  • Flow through porous media
  • Mathematics and mechanics of oil recovery
  • Rheology and dynamics of non-Newtonian fluids.