Chinese Physics Letters · 2008 · 32 citations · 18 references
EngineeringMechanical EngineeringPhysicsFluid DynamicsHeat TransferThermodynamicsHeat FlowHeat Transfer AnalysisHeat Transfer FundamentalsHeat Transfer In FluidsHeat Transfer ModelingThermal DiffusivityAnalytical Heat Transfer SolutionsConstant Heat Flux Boundary ConditionsConvective Heat FluxConvective Heat TransferFully Developed Heat TransferHeat Transfer In DuctsNusselt NumberTemperature Gradient Effects
We present a theoretical analysis for fully developed convective heat transfer in a circular tube for power law fluids by assuming that the thermal diffusivity is a function of temperature gradient. The analytical solution is obtained and the heat transfer behaviour is investigated under a constant heat flux boundary condition. It is shown that the Nusselt number strongly depends on the value of power law index n. The Nusselt number sharply decreases in the range of 0 < n < 0.1. However, for n > 0.5, the Nusselt number decreases monotonically with the increasing n, and for n > 20, the values of Nusselt number approach a constant.
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