Author : Naresh Dhamane, Manoj Sonawane,Yogesh Nikam, Vishal Muley

The current experimental work is conducted with copper corrugated tape inserts 1mm thick and 8.33, 9.79 twist ratios, but having same wave-widths. The inserts when placed in the way of the flow of the fluid, generate a high degree of disorder resulting in a boost in the heat flow pace as well as the pressure drop. The work includes the determination of friction factor and Nusselt number for various wavy twisted tape inserts with varying twist ratios, different wave-widths & different materials. The Reynolds number is varied from 4000 to 10000. Correlations for Nusselt number and friction factor are developed for the corrugated tape inserts from the obtained results. The results of varying twists in copper tapes have been compared with the values for the smooth tube. The copper insert with twist ratio 9.79 & wave-width 16mm shows increase in Nusselt number values by 135% & in friction factor by 100% as compared to the smooth tube values. When the copper material is compared with aluminium inserts are compared then the copper is having 41% higher enhancement efficiency as compared to the aluminium, hence comparing all the inserts the copper is having high heat transfer enhancement for same Reynolds number. The experimental results of heat transfer in round pipe outfitted with the different inserts is studied using a MATLAB program and used to predict the output functions by designing a program. The inputs to the program are Reynolds No, Temperatures and the output of the system is Nusselt number & friction factor.

Keywords: Corrugated, enhancement, heat transfer, turbulance, twist ratio