Heat Transfer Enhancement in Circular Tube Flow Using Graphene Oxide Nanofluid and Its Application to Multi-Heat Pipe

International Conference on Advances in Manufacturing, Materials and Energy Engineering 2018

材料科学;能源学

Torii, Shuichi^1

Department of Mechanical System Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto

860-8555, Japan^1

关键词: Circular tubes;    Convective heat transfer;    Filling ratio;    Heat Transfer enhancement;    Maximum heat transfer;    Multi-heat;    Thermal Performance;    Volume concentration;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/376/1/012016/pdf
DOI  :  10.1088/1757-899X/376/1/012016

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The experimental study is performed to study convective heat transfer behavior of nanoparticles, i.e., graphene oxide (GO) flowing through a horizontal tube heated under constant heat flux condition. Its application to a multi-heat pipe cooling device in the condition of different filling ratio (40%, 60%, 80% and 100%) under constant heat flux conditions is experimentally investigated. It was found that (i) heat transfer enhancement is caused by suspending nanoparticles, so that maximum value of the Nusselt number is over twice than that of the pure working fluid, (ii) the thermal performance of heat pipe increases with increasing the concentration of GO nanoparticles in the base fluid, while the maximum heat transfer enhancement yields at 0.2% volume concentration, (iii) GO/water nanofluid shows lower thermal resistance compared to pure water, (iv) the optimal thermal resistance is obtained at 100% filling charge ratio with 0.2% volume concentration, and (v) heat transfer coefficient of the heat pipe significantly increases with an increase in heat flux and GO nanoparticles concentration.