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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

THE EFFECT OF SHARP CORNERS OF THE CHANNEL ON HEAT TRANSFER COEFFICIENT OF NON-NEWTONIAN FLUIDS

S. Gh. Etemad
Chemical Engineering Department Isfahan University of Technology Isfahan 84154 Iran

DOI: 10.1615/IHTC11.2500
pages 103-107

Abstract

A Numerical simulation based on the Galerkin finite element method is carried out to obtain entrance region as well as fully developed thermal characteristics for power law model non-Newtonian fluids flowing inside circular and equilateral triangular ducts. The constant wall temperature (T) and constant wall heat flux both axially and peripherally (H2) are employed as thermal boundary conditions. The Nusselt number for both boundary conditions and for different power law indices are presented.
The results indicate that the influence of the power law index and geometry of the channel on the thermal characteristics are significant. The presence of the sharp corners of the duct results in decrease in the Nusselt number for both boundary condition but the effect of sharp corner on the Nusselt number for H2 boundary condition is much higher than that for T boundary condition.

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