Abstract
We treat numerically in this paper, the tran- sient analysis of a conjugated heat transfer process in the thermal entrance region of a circular tube with a fully developed laminar power-law fluid flow. We apply the quasi-steady approximation for the power-law fluid, identifying the suitable time scales of the process. Thus, the energy equation in the fluids is solved analytically using the well-known integral boundary layer technique. This solution is coupled to the transient energy equation for the solid where the transverse and longitudinal heat conduction effects are taken into account. The numerical results for the temporal evolution of the average tem- perature of the tube wall, hav, is plotted for different nondimensional parameters such as conduction param- eter, a, the aspect ratios of the tube, e and e0 and the index of power-law fluid, n.
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