Enhancement of thermal conductivity and kinematic viscosity in magnetically controllable maghemite (γ-Fe2O3) nanofluids

被引：38
作者：
Nurdin, Irwan [1 ,2 ]
Yaacob, Iskandar Idris [3 ]
Johan, Mohd Rafie [1 ,4 ]
机构：
[1] Univ Malaya, Fac Engn, Dept Mech Engn, Nanomat Engn Res Grp,Adv Mat Res Lab, Kuala Lumpur 50603, Malaysia
[2] Lhokseumawe State Polytech, Dept Chem Engn, Lhokseumawe 24301, Aceh, Indonesia
[3] Int Islamic Univ Malaysia, Dept Mfg & Mat Engn, Kulliyyah Engn, Kuala Lumpur 50728, Malaysia
[4] Univ Malaya, Nanotechnol & Catalysis Res Ctr, Kuala Lumpur 50603, Malaysia
来源：
EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2016年 / 77卷
关键词：
Enhancement; Thermal conductivity; Kinematic viscosity; Maghemite; Magnetic field; ETHYLENE-GLYCOL; NANOPARTICLES; PREDICTION; WATER; FLOW;
D O I：
10.1016/j.expthermflusci.2016.05.002
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The objective of this study is to investigate the thermal conductivity and kinematic viscosity enhancement of maghemite nanofluids at various particle volume fractions (0.1%, 0.2%, 03%, 0.4%, 0.5% and 0.6%) under the influence of an external magnetic field in different orientations (parallel and perpendicular). The effect of magnetic field strength and orientation on these properties is investigated at two temperatures of maghemite nanofluids (25 and 30 degrees C). The results show that the thermal conductivity enhancement of maghemite nanofluids increases with an increase in the magnetic field strength. The highest thermal conductivity enhancement (39.09%) is attained at the following experimental conditions: (1) particle volume fraction: 0.6%, (2) magnetic field strength: 300 Gauss, (3) temperature of maghemite nanofluid: 30 degrees C and (4) magnetic field orientation: parallel. The results also show that the kinematic viscosity enhancement of the maghemite nanofluids increases with an increase in the magnetic field strength. Likewise, the highest kinematic viscosity enhancement (31.91%) is attained at the above mentioned experimental conditions. Based on the results, it can be concluded that both the magnetic field strength and orientation has a significant effect on the thermal conductivity and kinematic viscosity enhancement of maghemite nanofluids. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码：265 / 271
页数：7
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