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首页> 外文期刊>Journal of magnetism and magnetic materials >Heat transfer enhancement of ferrofluid inside an 90° elbow channel by non-uniform magnetic field
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Heat transfer enhancement of ferrofluid inside an 90° elbow channel by non-uniform magnetic field

机译：非均匀磁场增强90°弯头通道内铁磁流体的传热

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摘要

In this article, numerical studies are done to examine the effects of non-uniform magnetic field on the heat transfer of ferrofluid inside 90° elbow channel. In order to simulate the flow inside the domain, the finite volume method with the SIMPLEC algorithm is applied to reveal the effects of non-uniform magnetic field on the thermal and friction factor of ferrofluid. The ferrofluid inside elbow is assumed single phase and laminar and constant heat flux is applied on the wall while a single wire is chosen as a source of non-uniform magnetic field in the center of the elbow. The effects of magnetic field on the flow feature and temperature distribution in the vicinity of magnetic source are comprehensively explained. Comprehensive parametric studies are done to study the influence of various factors such as intensity of magnetic field and Reynolds number on the heat transfer. Obtained results demonstrated that the average Nusselt number of ferrofluid increases more than 28.6% as the magnetic field with strength ofMn=9.32×106is applied in the vicinity of the elbow. Furthermore, heat transfer augments approximately 18% as the Reynolds number inside the elbow is increased from 50 to 100.
机译：在本文中，进行了数值研究，以研究不均匀磁场对90°弯头通道内铁磁流体传热的影响。为了模拟磁畴内部的流动，采用SIMPLEC算法的有限体积方法揭示了非均匀磁场对铁磁流体的热和摩擦系数的影响。假定弯头内的铁磁流体为单相和层流状，并且在壁上施加了恒定的热通量，同时选择了一根单线作为弯头中心的非均匀磁场源。全面解释了磁场对磁源附近流动特征和温度分布的影响。进行了全面的参数研究，以研究磁场强度和雷诺数等各种因素对传热的影响。结果表明，在肘部附近施加磁场强度为Mn = 9.32×106的磁场时，铁磁流体的平均努塞尔特数增加了28.6％以上。此外，随着肘部内的雷诺数从50增加到100，传热增加约18％。

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