磁场对Fe3O4-水纳米流体传热特性的影响  

Effect of Magnetic Field on Heat Transfer Characteristics of Fe3O4- Water Nanofluids

作　　者：翟郑佳 李国龙 朱恒宣[1] 杨历[1] 王进[1] Zhai Zhengjia;Li Guolong;Zhu Hengxuan;Yang Li;Wang Jin(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300400,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300400

出　　处：《辽宁石油化工大学学报》2020年第2期22-29,共8页Journal of Liaoning Petrochemical University

基　　金：国家自然科学基金项目(51576059);河北省研究生创新资助项目(CXZZSS2019012)。

摘　　要：对电加热器中纳米流体的传热效果进行了实验研究,采用两步法制备Fe3O4-水纳米流体。此外,还研究了质量分数为0.1%~2.0%的Fe3O4-水纳米流体在有/无磁场作用下对电加热器换热效率的影响,探讨了磁场作用下纳米流体的强化换热机理。结果表明,与基液(去离子水)相比,无磁场时质量分数为1.0%的Fe3O4-水纳米流体可使环境温度提升18.2%;在外磁场作用下,质量分数为1.0%的Fe3O4-水纳米流体可使环境温度提升35.1%。研究结果可为纳米流体在电加热器中的强化传热研究提供重要参考。The heat transfer effect of nanofluid in electric heater was studied. Fe3O4- water nanofluid was prepared by two-step method. The effect of Fe3O4- water nanofluid with various nanoparticle concentrations(mass fraction of 0.1%~2.0%) on heating efficiency of the electric heater with or without magnetic field was studied. Mechanism of enhanced heat transfer by Fe3O4- water nanofluids under a magnetic field was also discussed. Results show that the Fe3O4- water nanofluid with a mass fraction of 1.0%obtains 18.2% enhancement of heat transfer on environment temperature compares to without a magnetic field. The Fe3O4- water nanofluid with a mass fraction of 1.0% obtains 35.1% enhancement of heat transfer on environment temperature with an external magnetic field. This research provides an important reference for enhancements of natural convective heat transfer in nanofluid applications.

关 键 词：电加热器 纳米流体 磁场 自然对流 强化传热 

分 类 号：TK01[动力工程及工程热物理]