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The article presents computational fluid dynamics studies on heat transfer,   pressure drop, friction factor, Nusselt number and thermal hydraulic   performance of a plain tube and tube equipped with the three types of   internal grooves (circular, square and trapezoidal).Water was used as the   working fluid. Tests were performed for Reynolds number ranges from 5000 to   13500 for plain tube and different geometry inside grooved tubes. The maximum   increase of pressure drop was obtained from numerical modeling 74% for   circular, 38% for square and 78% for trapezoidal grooved tubes were compared   with plain tube. Based on computational fluid dynamics analysis the average   Nusselt number was increased up to 37%, 26% and 42% for circular, square and   trapezoidal grooved tubes respectively while compared with the plain tube.   The thermal hydraulic performance was obtained from computational fluid   dynamics analysis up to 38% for circular grooved tube, 27% for square grooved   tube and 40% for trapezoidal grooved tube while compared with the plain tube

Computational fluid dynamics analysis on heat transfer and friction factor characteristics of a turbulent flow for internally grooved tubes