Numerical and experimental analysis for fluid flow inside corrugated tube equipped with twisted tapes

In present paper is to study numerical simulation by using Finite volume method for Newtonian and non-Newtonian fluid flow inside corrugated tube equipped with typical twisted tape (TT) and V-cut twisted tape (VTT) at constant heat flux. For validation of this simulation, this results compared with empirical correlations of researchers. In this analysis water was as Newtonian fluid and 0.2 wt % carboxymethyle cellulse (CMC) in water was as a non-Newtonian fluid, the range of Reynolds number for Newtonian and non-Newtonian fluid varied (5300 to 25700) and (2400 to 6800) respectively. In this analysis, the effects of using different turbulence models, variable heat flux and creating V-cut on Nusselt number and friction factor is investigated. The obtained results showed that standard κ -ω model of turbulence for Newtonian fluid is a proper model rather than the other models and it had good agreements between experimental data, and the average differences for Nusselt number in typical and V-cut twisted tapes were less than 15.2% and 14.4% respectively. On other hand, in identical condition for non-Newtonian fluid, using of standard κ - ε model of turbulence is a proper model and the average differences on Nusselt number for typical twisted tape were less than 18%.