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ABSTRACTThe first part of the talk will focus on inertial effects in suspensions of spherical particles. To begin with, we will consider the interaction of a pair of particles in a simple shearing flow of a Newtonian fluid for the case where particle inertia is important. Particle inertia is shown to radically alter the topology of pair-trajectories; this has non-trivial consequences with regard to rheology, and leads to unexpectedly large shear-induced diffusive coefficients. In a similar manner, fluid inertia qualitatively alters the mechanism of heat transfer from a single particle in simple shear, leading to a convective enhancement. It is argued that the above change in streamline/pathline topology with inclusion of inertia is a generic feature expected to occur in most linear flows, and may play a role in the coagulation of particle-pairs in turbulence, as well as in the transfer of heat to/from particles in turbulent flows.
ABOUT THE SPEAKERDr. Ganesh Subramanian completed his Bachelors in Chemical Engineering (B.Chem) from UDCT, Bombay, in June 1996, and thereafter, went to Caltech (California Institute of Technology, Pasadena) to do his Ph.D with Prof. John Brady. He defended his thesis on "Inertial effects in suspension dynamics" in April 2002, and went to Cornell as a post-doctoral fellow to work with Prof. Don Koch. During this time, the areas he has been working on include orientation behavior of axisymmetric particles in shear flows, inertial effects in clusters of particles, lattice-Boltzmann simulations, multi-phase flow stability etc. |