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THE INFLUENCE OF FLUID RHEOLOGY ON HEAT TRANSFER IN LAMINAR IMPINGING FLOWS

Ajay Chatterjee
Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India; present address: Intel Corporation, Mail Stop:SC1 1-107,2200 Mission College Blvd., Santa Clara, CA 95052, USA

Sumeet S. Kapur
Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India; Present address: Infosys Technologies Ltd., Electronics City, Hossur Road, Bangalore 561229, India

S. C. Dhingra
Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

Résumé

Laminar impinging flow heat transfer is considered with a purely viscous inelastic fluid. The rheology of the fluid is modeled using a shear rate dependent viscosity coupled with asymptotic (zero shear) Newtonian behavior, and the velocity and temperature fields are computed numerically for a confined laminar axisymmetric impinging flow. It is shown that even small departures from Newtonian rheology lead to an off-stagnation point maxima in the Nusselt number profile, indicating that Newtonian fluid approximations cannot adequately describe experimental measurements in such situations. The numerical heat transfer results are interpreted in the context of the developing flow field.

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