Abstract

Abstract:- In this study, the thermal characteristics of turbulent nanofluid flow in a helical tube in the tube heat exchanger were assessed numerically through computational fluid dynamics (CFD) simulations. The results of both of the turbulent models: i.e realizable k-epsion (k- ε) and re- normalization groups (RNG) k-epsilon were compared. The thermal distribution contour determines that realizable and RNG k-ε models, both together a swirl dominated flow are of more uniform distributions of temperatures. The proper prediction of the two layer theory will results to have a uniform thermal distribution and proper dimension less wall distance let it be (Y+). The turbulent flow and heat