Effect of Curvature Ratio on The Heat Transfer and Pressure Drop in Coiled Tube

Harith Noori Mohammed

doi:10.24237/djes.2009.02201

Authors

Harith Noori Mohammed Department of Chemical Engineering, Collage of Engineering, University of Tikrit

Keywords:

Coil,, Curvature,, Heat transfer,, Pressure drop

Abstract

An experimental study has been conducted on steady-state natural convection heat transfer from helical coil tubes. Water was used as a bath liquid without any mixing and air was used as a coolant fluid. A straight copper tube of 13 mm ID, 14 mm OD and 3 m length was bend to fabricate the helical coil. Two coils are used in this experiment has a curvature ratio of 0.1101 and 0.0942. The data were correlated using tube diameter as the characteristic length. The results show that the overall heat transfer coefficient and pressure drop are increased when the flow rate of coolant and curvature ratio increase. Two correlations are presented to calculate the average Nusselt number inside and outside of coil

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References

Coronel, P. and Sandeep, K. P., "Heat Transfer Coefficient in Helical Heat Exchangers under Turbulent Flow Condition", International Journal of Food Engineering, vol. 4: Iss. 1, Article 4, (2008).

Paisarn N. and Jamnean S., "Effect of Curvature Ratio on the Heat Transfer and Flow Developments in the Horizontal Spirally Coiled Tubes", Int. J. Heat and Mass Transfer, vol. 50, pp. 444-451, (2007).

Mohamed E. Ali, "Natural Convection Heat Transfer from Vertical Helical Coils in Oil", Heat Transfer Engineering, vol. 27, no. 3, (2006).

G. S. Aravid, Y. Arun, R. S. Sunder and S. Subrahmaniyam, "Natural Convection Heat Transfer in Helical Coiled Heat Exchanger", IE (I) Journal-CH, vol. 84, (2003).

Ali, M. E., "Free Convection Heat Transfer from the Outer Surface of Vertically Oriented Helical Coils in Glycerol-Water Solution", Heat and Mass Transfer, vol. 40, no. 8, pp. 615-620, (2004).

H.K. Choi, G.J. Yoo, S.S. Kim, and Y.S. Choi, Numerical Analysis of Heat Transfer Characteristics for Coiled Heat Exchanger, ACTA Press, (2007).

Holman, J. P. Heat Transfer, 5th edition, McGraw-Hill, New York, (1981).