Experimental study of the effect of filling ratio, magnetic field and, inclination angle on thermal performance in a three-dimensional oscillating heat pipe

In this research, the performance of a three-dimensional oscillating heat pipe in different inclination angles from 0 to 90 degrees with distilled water and ferrofluid as operating fluid has been studied and compared experimentally. Fe3O4 ferrofluid was prepared with a mass fraction of 0.1% and tetramethyl ammonium hydroxide surfactant was used for its stability. First Experiments were performed at different input heat input fluxes (30 to 300 watts) and in filling ratios if 50 and 60%, and the optimal filling ratio (50%) was determined. Then with this value, the thermal performance of the oscillating heat pipe was evaluated at different angles without presence and also by applying a magnetic field. The experimental results showed that Fe3O4 nanoparticles could improve the thermal performance of the device. It was also found that the optimal filling ratio for this device is 50%. As the inlet heat flux increases, the thermal resistance of the OHP decreases. In addition, the results showed that the inclination angle of the heat pipe has a significant effect on the performance of the OHP. In horizontal mode, the device did not work at all, but by applying a magnetic field, the device can continue to operate.