Experimental Investigation of Heat Transfer Characteristics in a Circular Tube Fitted with Triangular-Cut Twisted Tape (TCTT) Inserts

An experiment was conducted to investigate the friction factor characteristics and heat transfer characteristics of a concentric tube with triangular cut twisted tape (TCTT) insert with twist ratio Y is 5.4 and depth of triangular cut was 1.2 cm were studied for laminar flow. This investigation also to find the Nusselt number, heat transfer coefficient and Reynolds number. The heat transfer enhancement was caused with the flow of fluid between the plain twisted tapes and twisted tape with triangular cut (TCTT). The experimental value of plain tube and triangular cut twisted tape obtained from the experimental work and these two-statistical data were compared with the results. The results shows that the heat transfer rate enhancement of induced with plain and with the increase of Reynolds number, TCTT inserts was increases. The Reynolds numbers were varied in the range of 5710 to 18366. At analogous of Reynolds number with Nusselt numbers in the tube with triangular-cut twisted tape insert were enhanced by 1.1 to 1.3 times compared to that of plain twisted tape tube. The configuration of TCTT insert offered higher friction factor and heat transfer rate than the plain twisted inserts.