Experimental and Numerical Study of Heat Transfer and Pressure Drop Non-Newtonian Nanofluid in Corrugated Tube with Twisted Tapes

In present research, an experimental and numerical study investigated for heat transfer of non-Newtonian nanofluid flows in corrugated tubes under constant heat flux which are equipped with twisted tapes. The experimental results are based on different Reynolds number from 2400 up to 6800 and with various volume concentrations of silicon dioxide (SiO_2) nanoparticles and different twisted ratios. Present numerical simulation is carried out by utilizing computation fluid dynamic (CFD) code and for validation of obtained results, they are compared to various turbulence modeling and empirical correlations presented by other researchers. Results of experiments showed that amount of power law index of non-Newtonian nanofluids increased while the consistency index generally decreased by intensifying volume concentrations of nanoparticles. Moreover, the numerical results showed standard κ–ε model of turbulence is more proper model rather than other available models.