论文部分内容阅读
实验选用外径为4mm、内径为2mm的铜质脉动热管研究了氧化石墨烯对以去离子水和体积分数为50%的乙醇溶液为工质的脉动热管传热性能的影响。实验分别采用加有少量氧化石墨烯的去离子水溶液(简称氧化石墨烯水溶液)和体积分数为50%的乙醇溶液(简称氧化石墨烯乙醇溶液),氧化石墨烯质量分数均为0.03%。实验发现:氧化石墨烯对以去离子水为工质的脉动热管传热性能具有强化作用,对以体积分数为50%的乙醇溶液为工质的脉动热管传热性能的影响较差,但都和脉动热管的加热功率密切相关。对于以去离子水为工质的脉动热管,在加热功率低于20 W时,氧化石墨烯对脉动热管的强化作用较弱;当加热功率在30~60 W时,氧化石墨烯对脉动热管的强化作用较强,达3.71%~11.33%,且强化作用随加热功率的增大呈逐渐增强趋势;但随着功率继续增大,氧化石墨烯的强化作用逐渐减弱,当加热功率达到80 W后,热管传热性能减弱,原因可能是氧化石墨烯颗粒出现了沉降现象。
The effects of graphene oxide on the heat transfer performance of pulsating heat pipe with deionized water and 50% ethanol solution as working medium were investigated by using copper pulsating heat pipe with outer diameter of 4mm and inner diameter of 2mm. Experiments were carried out using a small amount of graphene oxide deionized water solution (referred to as graphene oxide aqueous solution) and a volume fraction of 50% ethanol solution (referred to as graphene oxide solution), graphene oxide content was 0.03%. The experimental results show that graphene oxide can enhance the heat transfer performance of pulsating heat pipe with deionized water as the working fluid, and has a poor effect on the heat transfer performance of pulsating heat pipe with 50% ethanol solution as working medium. And the pulsating heat pipe heating power is closely related. For pulsed heat pipe with deionized water as the working fluid, the graphene oxide has a weak reinforcing effect on the pulsating heat pipe when the heating power is less than 20 W; when the heating power is 30-60 W, The strengthening effect is strong, reaching 3.71% ~ 11.33%, and the strengthening effect increases gradually with the increase of heating power. However, as the power continues to increase, the strengthening effect of graphene oxide gradually decreases. When the heating power reaches 80 W , Heat pipe heat transfer performance weakened, the reason may be graphene oxide particles appeared settlement phenomenon.