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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Using sharp wedge-shaped porous media in front and wake regions of external nanofluid flow over a bundle of cylinders
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Using sharp wedge-shaped porous media in front and wake regions of external nanofluid flow over a bundle of cylinders

机译：使用一束尖锐的楔形多孔介质在一堆圆柱体上的外部纳米流体流动的前部和尾部区域中

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PurposeThe purpose of this study is to analyze a new idea for external flow over a cylinder to increase the heat transfer and reduce pressure drop. Using wedge-shaped porous media in the front and wake regions of the cylinder can improve its hydrodynamic, and the rotating flow in the wake region can enhance the heat transfer with increased porousliquid contact. Permeability plays a vital role, as a high-permeable medium improves heat transfer, whereas a low-permeable region improves the hydrodynamic.Design/methodology/approachTherefore, in the current research, external forced convection of nanofluid laminar flow over a bundle of cylinders is simulated using a two-phase mixture model. Four cases with different porous blocks around the cylinder are assessed: rectangular porous; wedge shape in trailing edge (TEP); wedge shape in leading and trailing edges (LTEP); and no porous block case. Also, three different lengths of wedge-shaped regions are considered for TEP and LTEP cases.FindingsResults are presented in terms of Nusselt (Nu), Euler (Eu) and the performance evaluation criterion (PEC) numbers for various Reynolds (Re) and Darcy (Da) numbers.Originality/valueIt was found that in most situations, LTEP case provides the highest Nu and PEC values. Also, optimal Re and porous medium length exist to maximize PEC, depending on the values of Da and nanofluid volume fraction.
机译：目的这项研究的目的是分析一种通过气缸的外部流动的新思路，以增加热传递并减少压降。在圆柱体的前部和尾部区域使用楔形多孔介质可以改善其流体力学，而尾部区域中的旋转流可以通过增加多孔性液体接触来增强传热。渗透性起着至关重要的作用，因为高渗透性介质改善了热传递，而低渗透性区域改善了流体动力学。设计/方法/方法因此，在当前的研究中，纳米流体层流在一组圆柱体上的外部强制对流是使用两相混合模型进行仿真。评估了四种在圆柱体周围有不同多孔块的情况：矩形多孔；有孔的；多孔的。后缘楔形（TEP）;前缘和后缘的楔形（LTEP）；而且没有多孔块盒。此外，针对TEP和LTEP情况，考虑了三种不同长度的楔形区域。结果以Nusselt（Nu），Euler（Eu）以及各种雷诺（Re）和Darcy的性能评估标准（PEC）数表示（Da）数/原始值/值发现，在大多数情况下，LTEP情况提供了最高的Nu和PEC值。而且，取决于Da和纳米流体体积分数的值，存在最佳的Re和多孔介质长度以最大化PEC。

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