Turbulent Heat Transfer in a Channel with a Built-in Square Cylinder: The Eect of Reynolds Number

Turbulent heat transfer, in a three dimensional channel
ow, in the presence of a square cylinder,
was investigated numerically. The existence of a square cylinder in a channel, compared to a plain
one, changes the heat transfer rate from the walls of the channel. A Large Eddy Simulation (LES)
of a turbulent
ow was performed to simulate
ow behavior in a channel for Reynolds numbers
in the range of 1000 to 15000. The results obtained for the Nusselt number distribution along
the wall of the channel, at Re = 3000, followed those of experimental data with good accuracy.
It was observed that the existence of a square cylinder makes the attached wall boundary layer
separate, with a subsequent recirculation zone downstream of the cylinder. The Nusselt number
distribution along the wall of the channel shows an increase, with a relative maximum, slightly
downstream of the reattachment point. Heat transfer from the wall of the channel increases
with increasing Reynolds number. A correlation was obtained for the variation of the mean total
Nusselt number with the Reynolds number.