Numerical simulation using standard k- turbulence
model was developed to investigate numerically the
characteristic of backward-facing step flow in a concentric
pipe. This research is focused on the surface temperature, local
heat transfer coefficient and Nusselt number with the variation
of Reynolds number and step height, in a fully developed
turbulent air flow at room temperature. The design consists of
entrance tube, inner and outer tubes at the test section. The
inner tube is placed along the entrance tube at the test section
with an outer tube to form annular passage. The entrance tube
varies in diameter causing step height, s to vary (s= 0, 6 mm,
14.5 mm and 18.5 mm). Reynolds number and heat flux were
varied between 17050 and 44545 and 719 W/m2 and 2098
W/m2 respectively. The results show that the higher Reynolds
number and step height contribute to the enhancement of heat
transfer. Lastly, with the advent of computational fluid
dynamic software, fair and