LAUSR

In this paper, effects of flat plate obstacles and rectangular and triangular decorated bars on cooling of a hot bar were investigated experimentally and numerically. The experiments were performed in a wind tunnel with transient heat transfer through the hot bar. Results showed that in case of staggered tube banks and Reynolds range of 350–2100, heat transfer increased from 10 to 30 % while pressure decreased from 55 to 34 % and in case of in-line tube banks and the same range of Reynolds, heat transfer encountered a rise from 10 to 20 % and the pressure reduced from 15 to 8 %. Moreover our study indicates the Nusselt increased when Reynolds number enhances, furthermore, the Nusselt variation corresponding to the rectangular flat obstacles was compared to other modes.