Geometrical Shape of Pulsating Heat Pipe under Hyper Gravity Condition

Abstract

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.

A Preliminary Investigation on the Geometrical Shape of Pulsating Heat Pipe under Hyper-Gravity Conditions

“…According to the conclusions of the work, such a device undergoes a longer start-up process and exhibits more intense quasisteady-state temperature oscillations, with a higher value of thermal resistance. The presented research has been conducted at the Center of Applied Space Technology and Microgravity in Bremen while some of the results 1 , figures and text were published in the conference proceedings [16]. An experimental campaign was carried out based on the synthetic compound of the 3M TM company under the trade name NOVEC TM 7000 with a wide application [17].…”