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Abstract
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The heat transfer enhancement and pressure
drop of non-Newtonian power-law fluid flow due to the
presence of a bluff body inside a channel are numerically
investigated. Different cross-section geometries such as
circular, elliptical, trapezoidal, and inclined square cylinders
with the angles of 0°, 15°, 30°, and 45° are studied
and compared with straight channel. The results are presented
as streamlines, local and average Nusselt number,
friction factor and thermo-hydraulic performance for
the Reynolds number of 10, 20, and 30, Prandtl number
of 100, and power-law index of 0.4, 0.6, 0.8, and 1. The
blockage ratio is considered as 0.25 for all the cases.
The results show that the thermo-hydraulic performance
increases by decreasing the power-law index and the
square cylinder with inclined angle of 45° has maximum
thermo-hydraulic performance. The effect of the cylinder
geometry on the heat transfer enhancement was more than
that of the power-law index.
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