Plenary Lecture

Mixed Convection in Ducts

Professor Nicolas Galanis
Professeur titulaire
Chaire CRSNG en efficacité énérgetique industrielle
Departement de genie mécanique
Université de Sherbrooke
Sherbrooke (QC) Canada J1K 2R1

Abstract: Mixed convection in ducts occurs in many industrial installations when heat transfer rates are high and mass flow rates are low. In such cases, the buoyancy force influences the velocity and temperature profiles which are very different from those for forced convection or isothermal flows. Furthermore, flow reversal takes place in many cases and turbulent flow may occur for Reynolds numbers as low as 1000.
The presentation will review experimental, analytical and numerical results for different Prandtl, Grashof and Reynolds numbers. It will illustrate the axial evolution of velocity and temperature as well as those of the Nusselt number and friction coefficient for both conventional fluids and nanofluids. The production of entropy due to heat transfer and viscous effects will also be presented and discussed.

Brief Biography of the speaker:
Dr. Nicolas Galanis received his engineering degree from the National Polytechnic of Athens, Greece and his Ph.D. from Cornell University of Ithaca, N.Y., U.S.A. He is Professor of Mechanical Engineering at Universite de Sherbrooke, Quebec, Canada where he is the senior chairholder of the NSERC Chair in industrial energy efficiency. His research activities deal with energy conversion, renewable energies, refrigeration, fluid mechanics as well as heat and mass transfer. He is the author of more than 250 papers published in peer reviewed journals or conference proceedings. In 2005 the Canadian Society of Chemical Engineering and the Canadian Society of Mechanical Engineering awarded the Jules Stachiewicz Medal to Dr. Galanis for "…outstanding contributions to heat transfer in Canada".
Dr. Galanis has participated in research projects in Australia, France, Morocco and Tunisia. He has taught intensive courses at the University of Porto in Portugal and at Ecole Nationale d'Ingenieurs de Monastir in Tunisia. He is the cofounder of the Colloque Inter-Universitaire Franco-Quebecois which takes place every second year since 1993 alternatively in France and Quebec.