RT Journal Article ID 00619f4b3a9261a0 A1 Saha, Sujoy T1 THERMOHYDRAULICS OF TURBULENT FLOW THROUGH SQUARE AND RECTANGULAR DUCTS WITH TRANSVERSE RIBS AND TWISTED TAPES WITH AND WITHOUT OBLIQUE TEETH JF Journal of Enhanced Heat Transfer JO JEH(T) YR 2011 FD 2011-06-24 VO 18 IS 4 SP 281 OP 293 K1 turbulent swirl flow K1 forced convection K1 transverse ribs K1 twisted tape K1 square and rectangular ducts K1 oblique teeth AB Thermal and friction characteristics of turbulent flow through square and rectangular ducts with periodic transverse ribs and different types of twisted tapes with and without oblique teeth have been studied experimentally. Circular ducts have also been used. Correlations for predicting the friction factor and the Nusselt number have been developed and performance has been evaluated. Although both the friction factor and the Nusselt number are higher for all types of twisted tapes with oblique teeth in combination with transverse ribs, the performance evaluation has shown that the ducts with transverse ribs and regularly spaced twisted-tape elements with oblique teeth are better than those in the case without oblique teeth and this is recommended. Also, since the pressure drop in a heat exchanger is a small fraction of the total system pressure drop, the heat transfer being higher, full-length and short-length twisted tapes with oblique teeth in combination with transverse ribs can be recommended since the heat exchanging surface area requirement will be less. PB Begell House LK https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,4abd94aa04505f2b,00619f4b3a9261a0.html