The test setup was designed and built to further study the heat transfer performance of PHP heat spreader and startup of the embedded PHP heat spreader.

Plate pulsating heat pipe which can realize small and compact is studied in this paper.

Advances in pulsating heat pipe and its heat transfer characteristics;

Experimental investigation on flow and heat transfer of pulsating heat pipe;

With the miniaturization of electronic components and equipments, their heat transfer make pulsating heat pipes which are new and high efficiency heat transfer components gain more and more study.

Adopting R123 as the working medium,the effects of liquid filling ratio and heating mode on heat transfer limit were qualitatively analyzed on the open loop pulsating heat pipes test fig consisted of 40 elbows bent by fine copper tubes with inner diameter of 1 mm and 2 mm,and the experimental values were compared with calculated values by the Katpradit\'s correlations for heat transfer limit.

The structural and operational characteristics between two kinds of pulsating heat pipes(PHPs) were compared.

A visual study on a flat plate closed loop pulsating heat pipes was performed,which consists of 40 square channels(cross section 2×2 mm2 and length 165 mm for each channel) machined directly on an aluminum plate with overall size 180 ×120×3 mm3.