Fig. 19From: Numerical investigation on turbulent forced convection and heat transfer characteristic in spirally semicircle-grooved tubeThe correlations of a Nusselt number and b friction factor with numerical result for DR = 0.02–0.06 and c Nusselt number and d friction factor with numerical result for DR = 0.06–0.10 at PR = 1.4 and Re = 5000–20,000Back to article page