摘要
文章设计了微通道流动与传热实验平台,针对定制的Fe_(3)O_(4)纳米颗粒强化相变微胶囊悬浮液(micro-encapsulated phase change material slurry,MPCS)开展循环流动实验,分别从微通道压降、摩擦阻力系数、对流换热系数、微通道板温度等4个方面探究MPCS在微通道中的流动与传热特性。实验结果表明:MPCS在微通道中的压降随质量分数的增加而增大,且明显高于去离子水;与之相比,Fe_(3)O_(4)-MPCS在微通道中的压降并无显著变化。此外,微尺度流动可能更有利于在Re较小时产生湍流;MPCS的对流换热系数高于去离子水,且随Re及质量分数的增大而增大,微通道的板温度更低,表现出更好的冷却效果;相同质量分数的Fe_(3)O_(4)-MPCS具有更高的对流换热系数,传热性能更佳;在低Re下较低的热流密度更有利于传热,在Re较高时高热流密度下传热效果更佳。
In this paper,a microchannel flow and heat transfer platform was designed to carry out circulation flow experiments on customized Fe_(3)O_(4)nanoparticle enhanced micro-encapsulated phase change material slurry(Fe_(3)O_(4)-MPCS).The flow and heat transfer characteristics of MPCS in microchannel were experimentally researched from four aspects:pressure drop,friction resistance coefficient,convective heat transfer coefficient and microchannel plate temperature.The results show that the pressure drop of MPCS in microchannel increases with the increase of mass fraction,which is significantly higher than that of deionized water.In contrast,the pressure drop of Fe_(3)O_(4)-MPCS in microchannel has no obvious change.In addition,microscale flow may be more conducive to the emergence of turbulence with smaller Re.It is shown that the convective heat transfer coefficient of MPCS is higher than that of deionized water,and increases with the increase of Re and mass fraction.The microchannel plate temperature is correspondingly lower,indicating better cooling effect.Fe_(3)O_(4)-MPCS with the same mass fraction has a higher convective heat transfer coefficient and better heat transfer performance.The experimental results also indicate the influence of heat flux density on heat transfer performance.When Re is low,lower heat flux density is more conducive to heat transfer;when Re is high,higher heat flux density is better for heat transfer.
作者
朱华星
杨磊
ZHU Huaxing;YANG Lei(School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《合肥工业大学学报(自然科学版)》
北大核心
2025年第4期455-461,共7页
Journal of Hefei University of Technology:Natural Science
基金
安徽省自然科学基金资助项目(JZ2019AKZR0218)。
关键词
相变微胶囊
纳米强化
微通道
传热
流动特性
micro-encapsulated phase change material
nano-enhanced
microchannel
heat transfer
flow characteristic
