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Abstract
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Mixed convection heat transfer of non-Newtonian impinging slot jets was
investigated numerically in this study. The simulation was performed using a temperaturedependent
power-law viscosity model. The results showed that, for high Richardson
numbers, a recirculation zone was created in the vicinity of impingement wall which
prevents the jet stream from penetration into near wall region and decreases the Nusselt
number around the stagnation point. The e ects of jet-to-plate spacing, inlet Peclet
number, and jet inlet width on the ow structure and heat transfer characteristics of
impinging jet were studied using the numerical results. By decreasing jet-to-plate spacing
and jet inlet width and increasing inlet Peclet number, the ow reversal in the vicinity
of heated wall disappeared, and the local Nusselt number increased as a result of deeper
penetration of jet stream into the near wall region. Furthermore, the results indicate that
the maximum local and average Nusselt numbers belong to the shear-thinning jets with
minimum inlet width and minimum jet-to-plate spacing.
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