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1 Applied Mechanics and Engineering

1 1998

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Numerical heat transfer in a rectangular duct for a non-Newtonian fluid with shear rate-dependent thermal conductivity and temperature dependent viscosity

Shin S., Kim B. S.

Applied Mechanics and Engineering

1998

Vol. 3, no 2

323-337

The present numerical study investigates the effect of the shear rate-dependent thermal conductivity (SRDC) fluids on the heat transfer enhancement in a 2:1 rectangular duct flow. An axially and peripherally constant heat flux boundary conditions (H2) was adopted for a top-wall-heated configuration. The present numerical results of Nusselt numbers for SRDC fluid show the heat transfer enhancement over those of a shear rate-independent thermal conductivity fluid. The heat transfer enhancement is due to the effect of the increased thermal conductivity near the wall, which is attributed to the thigh wall shear rates. The present study proposes a correlation between the Nusselt number and variable thermal conductivity as follows; ___ . Both the temperature and shear rate-dependencies of the properties play important roles on the heat transfer enhancement.