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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Thermo-hydraulic and entropy generation analysis for magnetohydrodynamic pressure driven flow of nanofluid through an asymmetric wavy channel
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Thermo-hydraulic and entropy generation analysis for magnetohydrodynamic pressure driven flow of nanofluid through an asymmetric wavy channel

机译：磁力流体压力驱动纳米流体通过不对称波浪通道的热液压和熵产生分析

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Purpose - The purpose of this paper is to analyze the thermal, hydraulic and entropy generation characteristics for the magneto-hydrodynamic (MHD) pressure-driven flow of Al_2O_3-water nanofluid through an asymmetric wavy channel. Design/methodology/approach - Galerkin finite element method is used to solve the governing transport equations numerically within the computational domain using the appropriate boundary conditions. The temperature and flow fields are computed by varying Reynolds number (Re), Hartmann number (Ha) and nano-particle volume fraction (Φ) in the following range: 10 ≤ Re ≤ 500,0 ≤ Ha ≤ 75 and 0 ≤ Φ ≤ 5%. Findings - The formation of the recirculation zones in the wavy passages, the size of it and the strength of the vortices formed can be modulated by the application of the magnetic field. The overall heat transfer rate increases with Ha for all Φ both for a lower and higher regime of Re although the enhancement is more for lower values of Re and nanofluids as compared to base fluid and for intermediate values of Re, the effect of a magnetic field is almost insignificant. The magnetic performance factor (PF_(magnetic)) decreases with Ha although the rate of decrement varies with Re. The increase Φ also enhances PF_(magnetic) especially at lower and higher values of Re. The addition of nano-particle enhances the entropy generation at lower values of the Re, while the opposite effect is seen for higher values of Re. Practical implications - The present study has enormous practical relevance for the design of heat exchanger applied for solar collectors, process plants, textile and aerospace applications. Originality/value - The combined effects on the heat transfer rate and the associated pressure drop penalty due to the applied magnetic field for the flow of nanofluid through an asymmetric wavy channel have not been reported to date. The effect of the magnetic field on the formation of recirculation zones and hot spot intensity in the asymmetric wavy channel has been examined in detail. The PF_(magnetic) is investigated first time for the MHD nanofluid flow through a wavy channel.
机译：目的 - 本文的目的是通过不对称波状通道分析磁力 - 流体动力（MHD）压力驱动的磁动力学（MHD）压力驱动流动的热，液压和熵产生特性。设计/方法/方法 - Galerkin有限元方法用于使用适当的边界条件在计算域中的数值上以数字方式解决控制传输方程。温度和流场通过改变雷诺数（RE），Hartmann编号（HA）和纳米粒度分数（φ）在下列范围内计算：10≤Re≤500,0≤HA≤75和0≤φ≤ 5％。结果 - 通过施加磁场来调节波状通道中的再循环区域，其尺寸和所形成的涡流的强度。对于较低和更高的RE制度，总传热速率与HA的所有φ增加，尽管与基础流体相比，增强更高的Re和纳米流体的值更低，但用于RE的中间值，磁场的效果几乎微不足道。磁性能因子（PF_（磁））随HA减小，尽管减少速率随着RE而异。增加φ还增强了PF_（磁），尤其是RE的较低和更高值。添加纳米颗粒在RE的较低值下增强熵产生，而对RE的较高值看出相反的效果。实际意义 - 本研究具有巨大的实际实际相关性，可用于太阳能收集器，工艺植物，纺织和航空航天应用的热交换器设计。原始性/值 - 迄今为止，迄今为止，迄今为止，目前尚未报告对通过非对称波浪通道的纳米流体流动的施加磁场引起的传热速率和相关压降惩罚的组合效应。已经详细研究了磁场对不对称波浪通道中的再循环区域的形成和热点强度的影响。首次研究PF_（磁性）对MHD纳米流体流过波浪通道的第一次进行研究。

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