关键词: 脉动热管, 自湿润流体, 氧化石墨烯, 传热性能

Abstract: This research investigated heat transfer characteristics of the steady operation processes of pulsating heat pipe(PHP)at various heating power. The working fluid was mixture of graphene oxide dispersion at concentration of 0.5mg/mL and n-butanol aqueous solution with mass fraction of 0.5%. The volume ratio of the mixture was 2:5 and filling ratio was 50%. Heat transfer performances were compared between mixed solution, n-butanol aqueous solution and deionized water. The effects of graphene oxide on the heat transfer performance of self-rewetting fluid were explored by analyzing the temperature difference and thermal resistance of PHP with the mixture. The results showed that graphene oxide could enhance the heat transfer characteristics of PHP when added in self-rewetting fluid, and heating power had important effects on the heat transfer enhancement. Graphene oxide had no effects on the heat transfer characteristics of PHP with self-rewetting fluid at low heating power. The strengthening effects increased significantly with increase of heating power, but the increase became less significant when heating power increased to a certain value.

Key words: pulsating heat pipe, self-rewetting fluid, graphene oxide, heat transfer performance