MOHAMMAD BANEZHAD JANNATI - MSc Student, Mechanical Engineering, Islamic Azad University, Mashhad, Iran,
HAMIDREZA GOSHAYESHI - Asociated Professor , Mechanical Engineering, Islamic Azad University, Mashhad, Iran,

Pulsating heat pipe is an efficient heat exchange device which is being used for cooling and heating recovery .In the present work, we made a closed-loop pulsating heat pipe with six U-turns and we used water in our system with 40% and 50% filling ratios. Moreover, the use of water-Fe3O4 nanofluid was studied with two different filling ratios 40% and 50% and 1% mass concentration. Then, we used several magnets to produce 100 G magnetic field. At the end, we calculated heat resistance and heat transfer coefficients of water and water-Fe3O4 nanofluid in each step and compared the results and showed that 50% filling ratio of water-Fe3O4 nanofluid with magnetic field was the best choice in our study because of the best heat transfer coefficient.

Pulsating heat pipe, water-Fe3O4nanofluid, magnetic field, filling ratio, heat resistance coefficient, heat transfer coefficient