摘要
作为高效传热元件，振荡热管在解决微小空间但热通量较高的电子器件散热方面具有独特的优势，其工质的选取对振荡热管的传热性能具有重要影响。采用甲醇、丙酮纯工质及两者不同配比（7︰1,4︰1,1︰4,1︰7）的混合工质，对不同充液率（45%,62%,70%）和加热功率（10～100 W）工况时的热阻特性进行试验，分析甲醇、丙酮工质的物性及其相互作用特性对振荡热管传热性能的影响，得到甲醇/丙酮二元混合工质振荡热管的传热特性。结果表明：小充液率时，振荡热管蒸发段均出现明显的烧干现象，混合工质振荡热管烧干时热阻较纯工质小，即在50 W时，甲醇、丙酮纯工质振荡热管热阻分别为1.509℃/W、1.484℃/W，而甲醇/丙酮1︰7时振荡热管热阻为0.88℃/W，其他配比时热阻在纯工质及混合工质配比1︰7之间，特别是在丙酮中加入少量甲醇（比如甲醇/丙酮1︰7）能有效地改善振荡热管的烧干情况；大充液率下，混合工质振荡热管热阻随着加热功率的增大变得较为平缓且相互之间相差不是不大，传热性能普遍较好。
As a high efficient heat transfer element, the oscillating heat pipe（OHP） has unique advantages in solving the problem of electronic device heat dissipation with tiny space and high heat flux and its heat transfer performance is greatly affected by its working medium. The methanol/acetone binary mixture, as well as the pure methanol, acetone, have been selected as working mediums of OHP, then the heat transfer characteristics of methanol/acetone OHP has been researched by analysing the physical properties of the working mediums and its interaction characteristics on heat transfer performance of OHP under different ratios（7︰1, 4︰1, 1︰4, 1︰7）, filling ratios（45%, 62%, 70%）and heat inputs（10-100 W）. The results show that all evaporator sections of OHP are dried out obviously with small filling ratios. Compared with pure working mediums, the thermal resistance of mixture working medium is smaller when dried out, namely when the heat input is 50 W, the pure methanol, acetone are 1.509 oC/W and 1.48 oC/W, the methanol/acetone 1︰7 thermal resistance is 0.88 oC/W, between them are the thermal resistances of the rest ratios. In addition, the effect is more obvious when little methanol is added into acetone as working medium （such as methanol/acetone 1︰7）;With large filling ratios, the thermal resistances of mixture working mediums increased with little gradient and get close to each other as heat inputs increased gradually, the heat transfer performances are generally great.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第18期148-154,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51076104)
2012年度'科技创新行动计划'高新技术领域基金(12dz1143800)资助项目
关键词
振荡热管
二元混合工质
传热特性
热阻
oscillating heat pipe
binary mixture
heat transfer performances
thermal resistance
