H Salehi - Department of Chemical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Heat pipe and nano fluid research center,
S Zeinali Heris - Department of Chemical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Heat pipe and nano fluid research center,
S . H Noie - Department of Chemical Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran Heat pipe and nano fluid research center,

The application of two-phase closed thermoyphon is increasing in heat recovery systems in many industrial practices because of their high effectiveness. The enhancement heat transfer of the heat transfer devices can be done by changing the fluid transport properties and flow features of working fluids. In the present study, therefore, the decrease of thermoyphon thermal resistance with nanofluid is presented. The distillated water is used as a base working fluid while the nanoparticles used in the present study are the copper oxide nanoparticles with diameter of 30-50nm. Effects of magnetic field and nanoparticles volume concentrations on the thermal resistance of thermoyphon are considered. The nanoparticles and magnetic field have a significant effect on the enhancement of thermal resistance of heat pipe.

Nanofluid; two-phase closed thermosyphon; magnetic field