水基碳管纳米流体对流换热实验研究

PDF全文下载：2016020196

马连湘， 常强， 刘晓光， 韩亮， 何燕*

 （青岛科技大学 机电工程学院，山东 青岛 266061）

摘要： 建立了测量纳米流体对流换热系数h的实验系统，在过渡湍流状态下测量了不同碳管含量、不同入口温度以及流速对其对流换热系数的影响，分析了各影响因素的影响程度的大小及作用机理。实验结果表明：碳纳米管的加入改变了水内部的热传递过程，增大了水的管内对流换热系数；相同Re下，随着碳管质量浓度的不断增加，碳管纳米流体的对流换热系数相对基液水显著增加；随着碳管纳米流体入口温度的升高，对流换热系数逐渐增大，增幅变化跟碳管质量浓度有直接关系，例如当碳管质量浓度为0.8、1.0 g·L-1时，对流换热系数增幅先增大后减小，而碳管质量浓度达到12 g·L-1时，对流换热系数增幅加速增大；在碳管质量浓度一定的情况下，纳米流体的流速对h的影响程度比入口温度要大。

关键词： 碳纳米管； 纳米流体； 对流换热系数； 强化传热

 中图分类号： TB 34             文献标志码： A

 Experimental Study on Convective Heat Transfer of Waterbased Carbon Nanotubes Nanofluids

 MA Lianxiang, CHANG Qiang, LIU Xiaoguang, HAN Liang, HE Yan

 (College of Electromechanical Engineering,QingdaoUniversityof Science and Technology,Qingdao266061,China)

Abstract: An experimental system was built to study convective heat transfer feature of the nanofluid flowing in a tube. The convective heat transfer coefficient of waterbased carbon nanotubes nanofluids for the transition turbulent flow inside a tube was measured.The influence of convective heat transfer coefficient by varying content of carbon nanotubes, inlet temperature and flow rate was measured. The functional mechanism of various factors under different conditions and the size of the influence degree were analyzed. The experimental results showed that carbon nanotubes nanoparticles changes the inside heat transfer process of water and increases the convective heat transfer coefficient of the inner tube of water. With mass concentration of carbon nanotubes increasing, the convective heat transfer coefficient increases visibly; with temperature of the carbon nanotubes nanofluids′s entrance increasing, the convective heat transfer coefficient increases, and the increase have a direct relationship with mass concentration of carbon nanotubes.For example, when the concentration of carbon nanotubes was 08，10 g·L-1，the increase amplitucle of h first increase then decrease，when the concentration of carbon nanotubes reach 12 g·L-1, the increase amplitude of h increase accelerately.

 Key words:  carbon nanotubes; nanofluids; convective heat transfer; heat transfer enhancement

 收稿日期： 20141105

基金项目： 国家自然科学基金项目（51276091）.

作者简介： 马连湘(1962—)，男，教授，博士生导师.*通信联系人.

文章编号：16726987（2016）02019605； DOI： 10.16351/j.16726987.2016.02.015