Papers presented to the 11th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 20-23 July 2015.
In this paper a numerical study of two-dimensional
conjugate natural convection in square cavity containing heated
cylinders and outer isothermal boundaries is performed. The
cavity is designed to simulate an unfilled trough containing
electrical cables. The purpose of this paper is to investigate the
effect of geometrical arrangements of electrical cables in
underground cable ducts on the heat transfer from the cables.
The numerical investigation is performed using Computational
Fluid Dynamics. Asymetric flow around the cables caused the
temperature distributions around the cables for the different
geometric arrangement to be dissimilar. The local Nusselt
number around the cables was a function of the angle ( ), and
the Nusselt number distributions vary for each cable and
arrangement. The diagonal arrangement was found to be the
least favourable, as this arrangement leads to higher
temperatures in the cables compared to the vertical and
horizontal arrangement.
