Experimental investigation was conducted to explore the heattransport capability of pulsating heat pipe (PHP) working with different working fluidsThe heat transfer characteristics of PHP with water as working fluid were studied under different liquid filling rates

different heat loads and different inclination angles (0°and 90°).The heattransport capabilities of pulsating heat pipes with different working fluids (FS39E microcapsule fluid

water

Al2O3 nanofluid) were comparedThe results showed that the heattransport capability of PHP could be enhanced by using functional thermal fluids (FS39E microcapsule fluid and Al2O3 nano-fluid) as working fluid under specific conditionWhen using vertical bottom heating mode (inclination angle=90°)

1% FS-39E microcapsule fluid was the better working fluidWhen using horizontal heating mode (inclination angle=0°)

0.1% Al2O3 nanofluid was the better working fluidBut the stability of microcapsule fluid was much better than Al2O3 nanofluid