Effect of uniform external magnetic-field on natural convection heat transfer in a cubical cavity filled with magnetic nano-dispersion
Effect of uniform external magnetic-field on natural convection heat transfer in a cubical cavity filled with magnetic nano-dispersion
复制标题
均匀外磁场对填充磁性纳米分散体的立方空腔内自然对流换热的影响
DOI：
10.1016/j.ijheatmasstransfer.2019.118828
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
A. Pattamatta
中科院分区：
文献类型：
--
作者：
Desh Deepak Dixit;A. Pattamatta
外磁场的存在会影响磁性纳米颗粒分散过程中的传热。本文研究了外加均匀磁场对磁性颗粒和铁纳米弥散体自然对流换热的影响。实验在瑞利数为4.23× 105 ~ 1.0× 107的范围内进行.研究内容包括外磁场诱导热磁对流对自然对流换热的强化和抑制作用的实验和讨论。此外，本研究亦报告磁场对磁铁矿及铁奈米分散体之热传方向性影响之实验结果及相关解释。本文定量地给出了在磁场存在下，空腔在不同方向上的传热衰减/增强的程度。研究还探讨了在每种情况下，磁性流体中的颗粒体积分数对传热的影响。
Heat transfer in magnetic nano-particle dispersion can be influenced by the presence of external magnetic-field. This paper presents an experimental investigation on effect of external uniform magnetic-field on natural convection heat transfer in magnetite and iron nano-dispersion in a differentially heated cubical cavity. The experiments are conducted between the Rayleigh number range of 4.23× 10 5 to 1.0× 10 7. The study includes experiments and discussion on the corroborating and suppressing effects of thermo-magnetic convection induced by the external magnetic-field on the natural convection heat transfer. Additionally, this study also reports the experimental results and pertinent explanation on the directional effect of magnetic-field on the heat transfer in magnetite and iron nano-dispersion. The paper quantitatively presents the extent of heat transfer depreciation/enhancement in different orientations of the cavity in the presence of magnetic-field. The study also explores the effect of particle volume fraction in magnetic fluid on heat transfer in each case.