Research of the Heat-transfer Performance on Methanol/Acetone Oscillating Heat Pipe

Abstract

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.