EFFECT OF SOUND ON THE RATE OF HEAT TRANSFER FROM A CYLINDER PLACED NORMAL TO AN AIR STREAM.

An experimental investigation was carried out to study the effect of sound waves with a particular frequency on forced convective heat-transfer from a heated circular cylinder over the Reynolds number range from 5000 to 20000. The results indicate that the convective heat-transfer coefficient can be influenced by a given sound wave, and in this case it causes the Nusselt number to increase appreciably on the back half of the cylinder. On the other hand, the approach of the vortex region formed in the wake to the cylinder surface plays an important role in the mechanism of an increase in the Nusselt number in separated region.