Modelling flow and heat transfer in helically coiled pipes - Part 3: Assessment of turbulence models, parametrical study and proposed correlations for fully turbulent flow in the case of zero pitch

That report has been issued in the frame of the second research programme of ENEA-MSE agreement and it is one of the deliverabies of the task G 'Theoretical and experimental studies on IRIS critical components (SG, EHRS)' of the work-programme 2 'Evolutionary INTD reactors' of the research theme on 'Nuovo Nucleare da Fissione'. The document reports the results of a study aimed at evaluating fully turbulence flow and heat transfer in toroidal pipes of different curvature. Different turbulence models have been used in the numerical simulation: classic k-ε model, k-w model and second order Reyno!ds stress-w model. The reports suggest also a new correlation for fully turbulent flow based on momentum-heat transfer analogy, notably in the form known as the Pethukov correlation.