| dc.description.abstract | This article is trying to develop a new kind heat spreader, which were used the theory of pulsating heat pipes. Channels were manufactured on copper plate, to finish the flat plate pulsating heat pipes. When heat input, fluid makes phase changes, produce the vapor pressure difference between the evaporation area and condensation area, the major heat transfer mechanism in a pulsating heat pipe is the sensible heat of liquid. Channels arrangement designed to two types, which were single loop and double side loop. In order to understand the influence by the wide of channel, there are two kinds of channel size, which wide were 0.5 mm and 1 mm. In this article, also experiment three fill rate, which were 20 %、50 % and 80 %. The heat transfer characteristics of flat plat pulsating heat pipes were investigated experimentally.
The experimental results at the same input heat and same fill rate, the single loop design which heat transfer performance better than the double side loop. When fix the fill rate as 50 %, the minimum heating power is 15 W at 1 mm wide channel, 20 W at 0.5 mm wide channel. In the experiment of different fill rate, when fill rate 20 %, pulsation only occurs at heating power 15 W, as the heating power increase, pulsation stop. Also found that the optimal fill rate is around 50 % and 80 %.
The drag force which caused by the channel walls will decrease the liquidity, also decrease the range of pulsation. In order to decrease the spreading resistance, we should make the design of channel better. | en_US |