The experimental friction factor and Nusselt number data for laminar flow through a circular duct having wire-coil and helical screw-tape inserts have been presented. Peripherally and axially local temperatures on the duct outside wall have been measured. The temperature drop across the duct wall has been calculated to obtain the duct inside wall temperatures. Peripherally averaged and axially local temperatures have been used to get axially local Nusselt numbers. These axially local Nusselt numbers have been averaged over the whole length of the duct to get the mean Nusselt number. Predictive friction factor and Nusselt number correlations developed by log-regression analysis have also been presented. Nusselt number correlation takes care of the thermal development length represented by the Graetz number, swirl and inertia force due to forced convection at large Reynolds number, buoyancy force due to natural convection at low Reynolds number represented by Rayleigh number and the geometrical parameters of wire-coil and helical screw-tape inserts. The thermohydraulic performance has been evaluated. The helical screw-tape inserts in combination with wire-coil inserts perform better than the individual enhancement technique acting alone for laminar flow through a circular tube up to a certain value of fin parameter.
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Laminar Flow Heat Transfer and Pressure Drop in a Circular Tube Having Wire-Coil and Helical Screw-Tape Inserts
Sujoy Kumar Saha
Sujoy Kumar Saha
e-mail: sujoy_k_saha@hotmail.com
Mechanical Engineering Department,
Mechanical Engineering Department,
Bengal Engineering and Science University
,Shibpur, Howrah 711 103
, India
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Sujoy Kumar Saha
e-mail: sujoy_k_saha@hotmail.com
Mechanical Engineering Department,
Mechanical Engineering Department,
Bengal Engineering and Science University
,Shibpur, Howrah 711 103
, India
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received February 1, 2012; final manuscript received August 12, 2012; published online January 3, 2013. Assoc. Editor: William P. Klinzing.
J. Heat Transfer. Feb 2013, 135(2): 021901 (8 pages)
Published Online: January 3, 2013
Article history
Received:
February 1, 2012
Revision Received:
August 12, 2012
Citation
Kumar Rout, P., and Kumar Saha, S. (January 3, 2013). "Laminar Flow Heat Transfer and Pressure Drop in a Circular Tube Having Wire-Coil and Helical Screw-Tape Inserts." ASME. J. Heat Transfer. February 2013; 135(2): 021901. https://doi.org/10.1115/1.4007415
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