Numerical study of the effect of increasing the heat transfer coefficient of Tio۲ nanofluid in hot and cold pipes

In this three-dimensional numerical paper, the effect of increasing the heat transfer coefficient of forced displacement of TIO۲ nanofluid in hot and cold tubes, under constant heat flux placed around the tube, is compared to that of a straight circular tube. In the pipe and the collision with the pipe wall, the thermal boundary layer is disturbed and this increases the heat transfer coefficient of the fluid flow displacement. The results show that the fluid collision with the wall inside the pipe increases the turbulence with the fluid flow along the transverse Finally, by creating a good mixture in the flow, it causes the temperature profile to be flatter and the thickness of the thermal boundary layer to decrease, which leads to an increase in the transfer heat transfer coefficient. Therefore, by increasing the volume of nanofluid by ۴.۵%, the optimization of the transfer heat transfer coefficient by ۷.۸% under heat flux has been proven

Keywords:

Heat transfer , hot-cold pipe , nano fluid TIO۲ , constant heat flux