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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >The Influence of magnetic field on heat transfer of magnetic nanofluid in a sinusoidal double pipe heat exchanger
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The Influence of magnetic field on heat transfer of magnetic nanofluid in a sinusoidal double pipe heat exchanger

机译：磁场对传热的影响的磁nanofluid正弦管的两倍热交换器

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摘要

In this article, the effect of magnetic field on the Nanofluid flow inside a sinusoidal two-tube heat exchanger is investigated numerically. This study focuses on the influence of variable magnetic field in the heat transfer of heat exchanger while mixture is single phase. In this heat exchanger, the inner tube is sinusoidal and the outer tube is considered smooth. The magnetic field is established orthogonal to sinusoidal tube. The basis fluid is water with 4 vol.% Nano particles (Fe3O4). In our study, Ferrofluid flows in the internal tube (sinusoidal tube) as hot fluid and air flows counter currently as cold fluid in external tube. The finite volume method with the SIMPLEC algorithm is used for handling the pressure-velocity coupling. The numerical results present validated data with experimentally measured data and show good agreement with measurement. The influence of the variation of different parameters like geometric shape, intensity of magnetic field non-dimensional number and Reynolds number, on heat transfer is investigated. According to obtained results, sinusoidal formation of the internal tube significantly increases the Nusselt number inside a two-tube heat exchanger. Also, magnetic field enhances diffusion of the cold boundary layer to the central parts of the inner tube for various geometric shape coefficients. Our findings show that the diffusion also elevates as the intensity of the magnetic field is increased. So, Nusselt number and heat transfer increase and this augmentation intensifies in high Reynolds number. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：在本文中,磁场的影响在正弦two-tube Nanofluid流热交换器进行数值。研究重点是变量的影响磁场的热传递热量换热器是单相混合物。热交换器,内胎是正弦外管被认为是光滑的。场建立了正交正弦管。粒子(Fe3O4)。内部管(正弦管)热目前液体和空气流量计数器一样冷流体在外部管。SIMPLEC算法用于处理压力速度耦合。结果现在的验证数据实验测量数据和显示良好与测量。不同参数的几何变化形状,磁场强度无因次数和雷诺数传热研究。获得的结果,正弦的形成努塞尔特内部管显著增加数量在一个two-tube热交换器。磁场增强扩散的冷边界层内的中央部分管对各种几何形状系数。我们的研究结果也表明,扩散提升为磁场的强度是增加了。转移增加增大在高雷诺数加剧。化学工程师学会。爱思唯尔帐面价值保留所有权利。

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