Experimental Study of Heat Transfer for Wavy Twisted Tape Insert of Various Pitches Placed in a Circular Tube

Among many techniques (both passive and active) investigated for augmentation of heat transfer rates inside circular tubes, a wide range of inserts have been utilized, particularly when turbulent flow is considered. A lot of methods are applied to increase thermal performance of heat transfer devices such as treated surfaces, rough surfaces, swirling flow devices, coiled tubes, and surface tension devices [1]. Twisted tape swirl turbulator is one of the commonly used passive types for heat transfer augmentation due to thei