不同磁场作用下Fe3O4/water纳米流体层流流动对流传热系数的实验研究

doi:10.11949/j.issn.0438-1157.20170820

化工学报 ›› 2018, Vol. 69 ›› Issue (4): 1349-1356.DOI: 10.11949/j.issn.0438-1157.20170820

不同磁场作用下Fe₃O₄/water纳米流体层流流动对流传热系数的实验研究

沙丽丽, 巨永林, 张华

上海交通大学制冷与低温工程研究所, 上海 200240

收稿日期:2017-06-26 修回日期:2017-11-27 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: 巨永林
基金资助:
国家自然科学基金项目（51006069）。

Experimental investigation of convective heat transfer coefficient using Fe₃O₄/water nanofluids under different magnetic field in laminar flow

SHA Lili, JU Yonglin, ZHANG Hua

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2017-06-26 Revised:2017-11-27 Online:2018-04-05 Published:2018-04-05
Supported by:
supported by the National Natural Science Foundation of China (51006069).

摘要/Abstract

摘要：

对体积分数为3%的Fe₃O₄/water纳米流体在不同温度、不同磁场大小和方向的均匀磁场和梯度磁场作用下的对流换热进行了详细的实验研究。首先，开展了纳米流体能量方程的量纲1分析，讨论了纳米流体强化换热的机理。发现磁性纳米粒子所受到的磁力远远大于布朗运动力。实验测试结果与量纲1分析相吻合，在垂直均匀磁场作用下，纳米流体层流流动的平均对流传热系数提高了5.2%；在垂直梯度磁场作用下，平均对流传热系数提高了9.2%。而在水平均匀磁场作用下，纳米流体平均对流传热系数下降了4.8%。另外，随着温度的升高，对流传热系数均逐渐升高。

关键词: 纳米粒子, 对流, 传热, 磁场, 布朗运动

Abstract:

The convective heat transfer coefficients of 3%(vol) Fe₃O₄/water nanofluids were investigated at different inlet temperatures, under the perpendicular, uniform and gradient magnetic field and parallel magnetic field. Based on the non-dimensional analysis of the energy equation for the Fe₃O₄/water nanofluids, the effect of the magnetic field instead of the thermal motion of magnetic nanoparticles dominated the thermal transfer performance of Fe₃O₄/water nanofluids. The maximum increase of the convective heat transfer of Fe₃O₄/water nanofluids were 5.2% and 9.2%, respectively, under perpendicular, uniform and gradient magnetic fields. The maximum decrease of 4.8% for the convective heat transfer was observed under parallel and uniform magnetic field. In addition, the convective heat transfer coefficient increased with the temperature of Fe₃O₄/water nanofluids. The experimental results agreed well with the non-dimensional analysis.

Key words: nanoparticle, convection, heat transfer, magnetic field, Brownian motion

中图分类号:

TK114

沙丽丽, 巨永林, 张华. 不同磁场作用下Fe₃O₄/water纳米流体层流流动对流传热系数的实验研究[J]. 化工学报, 2018, 69(4): 1349-1356.

SHA Lili, JU Yonglin, ZHANG Hua. Experimental investigation of convective heat transfer coefficient using Fe₃O₄/water nanofluids under different magnetic field in laminar flow[J]. CIESC Journal, 2018, 69(4): 1349-1356.

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不同磁场作用下Fe₃O₄/water纳米流体层流流动对流传热系数的实验研究

Experimental investigation of convective heat transfer coefficient using Fe₃O₄/water nanofluids under different magnetic field in laminar flow

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