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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

ENHANCEMENT OF HEAT TRANSFER BY CHAOTIC ADVECTION IN A SINGLE SCREW EXTRUDER WITH A STAGGERED FLIGHT GEOMETRY

Get access (open in a dialog) DOI: 10.1615/IHTC11.2030
pages 399-404

Resumo

The concept of chaotic advection or Lagrangian turbulence is used in establishing enhancement of heat transfer and mixing in a single screw extruder with a staggered flight geometry. The flow inside the channel is assumed to be two-dimensional and three-directional. Under the assumption of Newtonian fluid and Stokes flow, the cross-channel flow velocities are obtained by using the finite difference method. From these numerical solutions and the series solution for the down-channel velocity component, trajectories of passive particles are then obtained to visualize the Poincare map as well as to compute the Liapunov exponent. It is shown that a staggered flight geometry indeed provides a chaotic stirring, or well-mixing property. This geometry further enhances the heat transfer characteristics. The enhancement effect increases as the channel aspect ratio(depth/width ratio) increases.