Vapor-liquid pulsating phenomenon and heat transfer behavior in GO-nanofluid pulsating heat pipe

被引：0

作者：

Wang W. ^{[1
]}

Zhao F. ^{[1
]}

Wang L. ^{[1
]}

Cai Y. ^{[2
]}

Zhao Y. ^{[3
]}

Yang G. ^{[1
]}

Sun J. ^{[1
]}

机构：

[1] School of Power and Mechanical Engineering, Wuhan University, Wuhan

[2] Energy and Electricity Research Center, Jinan University, Zhuhai

[3] Beijing Institute of Spacecraft Environment Engineering, Beijing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Graphene oxide(GO); Nanofluid; Phase change heat transfer; Pulsating heat pipe; Vapor-liquid two-phase flow;

D O I：

10.11817/j.issn.1672-7207.2021.06.008

中图分类号：

学科分类号：

摘要：

The purpose of the study is to fully reveal the unique flow behavior and oscillating heat transfer performance of graphene oxide(GO) nanofluids inside pulsating heat pipe(PHP). Firstly, GO-water based nanofluids with different mass fractions were prepared. Secondly, a closed multi-loop PHP visualization experiment platform was set up. Thirdly, based on the flow pattern evolution process of PHP at stable status, the effects of heat flux and GO-nanoparticles mass fraction on the temperature fluctuation amplitude of PHP were analyzed. Finally, the influence of the vapor/liquid two phase flow pattern transition on the heat and mass transportation performance were discussed. The results show that with the increase of heat loads, complex vapor/liquid flow patterns and transition phenomena are observed such as bubbly flow, plug flow and semi-annular/annular flow and the amplitude of vapor plug/liquid slug pulsation also increases significantly. In addition, the evolution of vapor/liquid flow pattern in the evaporation section mainly occurs during the stagnation and flow process of vapor-liquid two phases. Moreover, the "liquid bridge" fracture is the main reason for the discrete distribution of vapor/liquid slugs in the condensing section. When mass fraction is 0.075%, the pulsating convection heat transfer coefficient and the number of vaporization cores of the PHP significantly increase and its heat and mass transfer performance are optimal, which causes the reduction rate of effective thermal resistance to reach 25%. However, when mass fraction is 0.100%, the phenomenon of "braking" or "stagnation" is easily induced in the evaporation section. The corresponding thermal resistance reduction efficiency reaches 15%, which is almost the same as that of mass fraction with 0.050%. The pulsation frequency and vapor/liquid plug velocity of GO-nanofluids are slightly reduced at high mass fractions, and the heat transfer enhancement effect is also obviously weakened. © 2021, Central South University Press. All right reserved.

引用

页码：1789 / 1797

页数：8

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