Paper Details

This review paper deals with the use of modified twisted tape inserts as Passive Heat transfer Augmentationdevice. Effect of Reduced width twisted tape (RWTT), Baffled Reduced width twisted tape (BRWTT1) & Baffled Reducedwidth twisted tape with holes (BRWTT2) on heat transfer and friction factor for heating of water for Reynolds number range2500-30000, was studied experimentally in a double pipe heat exchanger. Based on constant flow rate, the heat transfercoefficient were found to be 1.18-3.66, 2.61-7.07 & 3.58-8.08 times the smooth tube values for RWTT, BRWTT1 & BRWTT2respectively. The friction factor values were found to be 3.23-5.96, 7.79-11.23 & 8.86-14.44 times the smooth tube values forRWTT BRWTT1 & BRWTT2 respectively. Based on constant pumping power, the heat transfer coefficient values were foundto be 0.88-1.62, 1.59-3.70 & 2.12-4.49 times the smooth tube values for RWTT, BRWTT1 & BRWTT2 respectively. Based onthe increase in Heat transfer coefficient, Performance evaluation criteria R1 & R3, it was concluded that Baffled Reducedwidth twisted tape & Baffled Reduced width twisted tape with holes performs much better than the Reduced width twistedtapes(RWTT) of the same twist ratio. Whenever inserts are used for the heat transfer enhancement, along with the increase inthe heat transfer rate, the pressure drop also increases. This increase in pressure drop increases the pumping cost. Thus it’shighly essential not to allow the pressure drop to go beyond a specified value while going for heat transfer enhancementtechniques using inserts.

Dharmesh A. Agrawal, Aswin M. Saigopal, Mannan P. Tewar, Ankit C. Shukla, “Design And Other Factor Involved In The Fabrication Of Heat Exchanger Experimentation Setup.”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 5, Issue 1, pp. 538-542, January 2018.