Two different approaches for analysing heat transfer in a power-law fluid flow between parallel plates

Abstract

In this paper, Nusselt numbers for a power-law fluid in a fully developed laminar flow between parallel plates with constant, and different, wall heat fluxes in the presence of dissipation effects are presented. The Nusselt numbers values were obtained following two different approaches. One is the "classical" approach, based on a single bulk temperature, and this approach is used in this work to obtain for the first time generic analytical expressions for Nusselt numbers. In the new approach, different bulk temperatures are used for each Nu ′ determination, one bulk temperature for each side of the location of the temperature profile where the derivative ∂T/ ∂y=0.