Three-Dimensional Conjugate Conduction-Mixed Convection with Variable Fluid Properties in a Heated Horizontal Pipe

This study concerns the numerical simulation of the three dimensional conjugate
conduction-mixed convection heat transfer in a horizontal heated pipe with a small wall thickness.
The fluid physical properties are variable with temperature ’and the heat losses from the outer
surface of the pipe to the ambient are considered. The model equations of continuity, momenta and
energy are numerically solved with a finite volume method. The obtained results show that the
thermal and the flow fields are three-dimensional, the non-uniformity of the heat flux at the
interface wall-jluid is signijicant and the mean Nusselt number in the pipe is considerably
increased. The numerical results of our study are in good agreement with those of an experimental
work done with the same geometric, dynamic and thermal parameters.

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