Scott Wahlquista, Amir Alia,b,*, Su-Jong Yoonc, Piyush Sabharwallc
Frontiers in Heat and Mass Transfer, Vol.18, pp. 1-8, 2022, DOI:10.5098/hmt.18.35
Abstract The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated
by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor (f) are compared for the laminar flow regime (Re = 250-
2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly
increased the f over the circular helical tube. The best performance with the highest Nuand lowest f occurs at the coil curvature ratio (dh/D) of 0.17.
The quantified enhancement performance factor (h)… More >
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