高功率平板热管传热性能的实验研究

A novel copper-water flat heat pipe with porous metal-foam wicks has been conducted to study its heat transfer characteristics working in high heat flux and anti-gravity conditions. The effects of inclination angle, filling ratio and heat loads on the heat transfer characteristic of flat heat pipe, including its thermal response performance and thermal resistance, were investigated experimentally. The results showed that the flat heat pipe has a favorable thermal response performance. It can reach a stable state within 60 s. The thermal resistance of flat heat pipe decreases first and then increases with increase of filling ratio, and flat heat pipe with a filling ratio of 20% has the best performance. Inclination angle has a significant effect on thermal performance. Under the premise that the maximum temperature is within 90℃, flat heat pipe can dissipate 300 W with a thermal resistance of 0.0109 K/W. Besides, compared with the heat pipes reported in the literatures, this flat heat pipe not only obtains a lower thermal resistance, but also achieves effective heat conduction with higher heat flux. These results are of great significance to the design of advanced flat heat pipes.