Heat transfer with coiled wire turbulence promoters

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Abstract
An experimental study of forced convection heat transfer and frictional power loss for water flowing in a vertical tube is reported in this paper. The study investigates the effect of coiled wire turbulence promoters of various pitch to diameter ratio (1.00–5.50) upon the Nusselt Prandtl modulus Nu/Pr1/3 and Fanning friction factor Cf for three different wire diameters, 0.052‐in., 0.063‐in. and 0.072‐in. Analysis of the computed results indicates that heat transfer increases by as much as 280%, though at the cost of much larger increase in frictional power loss. Consequently, coiled wire turbulence promoters can be used with advantage for cases where pumping power is not the dominating factor and reduction in weight and size of the equipment is more important.The present results and those of three previous investigations of heat transfer in tubes with coiled wire turbulence promoters were satisfactorily correlated by the expression which was found to be independent of the tube diameter, wire diameter, pitch to diameter ratio and the test fluid.

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