Heat Transfer Essay

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Experimental investigation on convective heat transfer characteristics in a circular tube fitted with pierced twisted tape and wire coil
E. Kannan*, C. Balasuthagar, S. Ponsankar, R.K. Barathraj
Department of Mechanical Engineering, SRM University, Kattankulathur,
Chennai, Tamil Nadu – 603203.

Abstract Enhancing the heat transfer is one of the techniques to increase the performance of the heat exchanger system. Among the enhancement methods, passive techniques attract the researchers due to its lower power requirement. Literatures particularly indicate that insertion of tape is the economical method to enhance the heat transfer rate. Here, the heat transfer from circular cross section tube fitted with pierced twisted tape and
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The influence of using the pierced twisted tape and wire coil on heat transfer is significant for all Reynolds number. With increase in twist ratio the performance factor decreases. With increase in coil pitch ratio the thermal performance decreases.
4. CONCLUSION Studies on the heat transfer characteristics in a circular tube fitted with pierced twisted tape and wire coil for various twist ratio has been done experimentally. The results indicate that the nusselt number increases with decrease in the twist ratio. The thermal performance factor is more than 1.44 while using the pierced twisted tape with lower twist ratio and lower wire coil ratio.
5. REFERENCES
1. Shyy Woei Chang , Yih Jena Jan , Jin Shuen Liou “Turbulent heat transfer and pressure drop in tube fitted with serrated twisted tape” ,2007, International Journal of Thermal Sciences, vol 46 ,pp 506–518.

2. Paisarn Naphon “Heat transfer and pressure drop in the horizontal double pipes with and without twisted tape insert”,2006,International Communications in Heat and Mass Transfer ,vol 33, pp

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