Numerical investigation of Cuo-Oil nanofluid heat transfer with two-phase method

A new numerical investigation has been carried out to study the heat transfer characteristics of nanofluid flow inside helical tube under constant heat flux. The tubeis made by cupper and Nanofluids with different particle volume concentrations of 0.5%, 1% and 2% are used. The effect of different parameters such as flow Reynolds number, fluid temperature, nanofluid particle volume concentration, two different constant heat fluxes 1500 W/m2 & 3800 W/m2 and heat transfer coefficient of the flow are studied. For validation results such as Nusselt number and convection heat transfercoefficient obtained from numerical model compared to the experimental results. Also to verify the accuracy of method, grid independency has studied for each heat fluxes.observation show that convection heat transfer coefficient increased with increasing the nanoparticles concentration and results from numerical simulation compared withexperimental show that this new numerical method has high accuracy and can correctlypredict the heat transfer behavior of nanofluids in different volume concentration and heat flusex

کلیدواژه ها:

heat transfer ، nanofluid ، helical tube ، numerical method ، two phase