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Numerical Analysis of Fluid Flow and Heat Transfer in Entrance and Fully Developed Regions of a Channel With Porous Baffles

机译:多孔挡板通道入口及发达区域流体流动与传热的数值分析

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摘要

In the present study, analysis of fluid flow and heat transfer in the entrance and periodically fully developed regions of a channel with porous baffles is numerically studied. The Navier-Stokes and Brinkman-Forchheimer equations are used to model the fluid flow in the open and porous regions. The flow is assumed to be laminar. A finite-volume based method in conjunction with the SIMPLE algorithm is used to solve the equations. The local thermal equilibrium model is adopted in the energy equation to evaluate the solid and fluid temperatures. The effects of parameters such as baffle height, baffle spacing, Reynolds number, and thermal conductivity ratio between the porous baffles and the fluid on the flow field and local heat transfer rate are studied at relatively low and high values of Darcy number. Results show that local heat transfer coefficient significantly depends on the formation and variation of the recirculation caused by the porous baffles, such that, in the cases where use of porous baffles leads to recirculation zone, the local Nusselt number in the entrance region would be less than that of the fully developed region. It is also shown that heat transfer performance ratio is significantly improvedfor high Prandtl number fluids.
机译:在本研究中,对带有多孔挡板的通道的入口和周期性充分展开区域中的流体流动和传热进行了分析。 Navier-Stokes和Brinkman-Forchheimer方程用于对开放和多孔区域中的流体流动进行建模。假定流动为层流。结合SIMPLE算法使用基于有限体积的方法来求解方程。能量方程采用局部热平衡模型来评估固体和流体温度。在相对较低和较高的达西值下,研究了折流板高度,折流板间距,雷诺数以及多孔折流板与流体之间的导热系数等参数对流场和局部传热速率的影响。结果表明,局部传热系数显着取决于多孔挡板引起的再循环的形成和变化,因此,在使用多孔挡板导致再循环区域的情况下,入口区域的局部Nusselt值会更少比发达地区还表明,对于高普朗特数流体,传热性能比显着提高。

著录项

  • 来源
    《Journal of Heat Transfer》 |2016年第6期|062601.1-062601.10|共10页
  • 作者

    Amin Davari; Mehdi Maerefat;

  • 作者单位

    Department of Mechanical Engineering, Tarbiat Modares University, Tehran 14115-111, Iran;

    Department of Mechanical Engineering, Tarbiat Modares University, Tehran 14115-111, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fluid flow; heat transfer; porous baffle; Nusselt number;

    机译:流体流量传播热量;多孔挡板努塞尔数;
  • 入库时间 2022-08-18 00:22:12

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