Abstract
Heat transfer behavior for non-Newtonian power law fluids flow in circular duct with laminar
flow, fully developed, constant heat flux. And constant wall temperature was studied. A
mathematical model which is capable of accurately predicting temperature and velocity profiles and
heat transfer rates for power law non-Newtonian fluids was obtained. The theoretical Nussult
number was compared with previously published works where good agreement was noticed, which
can be easily evaluated using theoretical model as a function of power law index only for constant
heat flux and as a function of power law index and Graets number for constant wall temperature. It
was found find that Nussult Number decreases when values of power index increases.
