Heat transfer and flow characteristics of Fe3O4 -water nanofluids under magnetic excitation

被引：89

作者：

Zhang, Xilong ^{[1
,2
]}

Zhang, Yongliang ^{[1
]}

机构：

[1] Qingdao Univ Technol, Sch Mech & Automot Engn, Qingdao, Shandong, Peoples R China

[2] Qingdao Univ Technol, Minist Educ, Key Lab Ind Fluid Energy Conservat & Pollut Contr, Beijing, Peoples R China

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2021年 / 163卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Magnetic nanofluid; Magnetic field intensity; Volume fraction; Magnetic field direction; Thermal boundary layer;

D O I：

10.1016/j.ijthermalsci.2020.106826

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Numerical simulations were adopted to explore the heat transfer and flow characteristics of magnetic nanofluids under different magnetic field intensities, volume fractions, and magnetic field directions. Due to these parameters have a significant effect on thermal hydraulic performance and the mechanism of this enhancement are not yet clear, a turbulent model of Re-normalization group (RNG) k-epsilon is used to analyze the variation of thermal boundary layer and particle motion. The obtained results found that the effect of heat transfer enhancement was small under a weak magnetic field, but it increased considerably under a strong magnetic field. Besides, the convection heat transfer coefficient initially increased and then decreased with an increase of volume fractions of magnetic nanoparticles. Moreover, the directions of the magnetic field have a significant effect on convective heat transfer coefficient, which results in 8% increase when the direction is perpendicular to direction of flow.

引用

页数：9

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