The Effect of Nano Hybrid on Thermal Efficiency of Double Tube Heat Exchangers

In this study overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements andhybrid nanofluid were studied experimentally. hybrid nanoparticles with a diameter of 20nm and aconcentration of 1% (w/w) were prepared. The effects of temperature, mass flow rate, and concentration ofnanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regimewere investigated.When using twisted tape and nanofluid, heat transfer coefficient was about 40 percenthigher than when they were not used. The experimental results also showed that 1% Al2O3/CuO nanofluidwith twisted tape has slightly higher heat transfer when compared to 1% hybrid nanofluid without twistedtape. The system was used for modeling neural networks.As well as data Reynolds number andconcentration as input nanoparticles overall heat transfer coefficient was chosen as a target. The correlationcoefficient for all data 0.98 is the successful prediction is shown.

Keywords:

Nusselt number , heat transfer , nanofluid