The paper concerns a heat transfer characteristics for a pulsating heat pipe (PHP) under hyper-gravity condition. Two loops of pulsating heat pipe with the internal diameter of 1.5 mm were filled and tested with HFE-7000 as a working fluid. The experimental setup allows for the investigation of two crucial parameters affecting the thermal process i.e. rotational speed (acceleration from 1 to 8g) and filling ratio (44 and 66, %). As a result, the dependences of the thermal resistance on the rotational speeds were obtained, thus declaring the optimal conditions for the heat transport process. The increase in filing ratio (FR) of the working fluid in hyper-gravity condition improves the thermal efficiency of PHP, as well as the direction of the evaporation section bending.

Many industrial processes require the use of efficient heat-transport devices in challenging environments. One solution is the use of passive devices that utilize multiphase flows. The aerospace sector is one industry where devices operate in normal gravity, microgravity, and hyper-gravity conditions. The study demonstrates the use of two different pulsating heat pipe geometries subjected to normal and hypergravity conditions (acceleration from 1g to 8g). The working fluid used was HFE-7000 at volumetric filling ratios of 44% and 66%. The results showed that an appropriate geometrical adjustment improves the performance of the PHP under hypergravity conditions, as does a higher volumetric filling ratio.