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A numerical study of three-dimensional laminar mixed convection past an open cavity

机译：三维三维层流对流经过开放腔的数值研究

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摘要

A numerical study has been carried out to analyze the effects of mixed convective flow over a three-dimensional cavity that lies at the bottom of a horizontal channel. The vertical walls of the cavity are isothermal and all other walls are adiabatic. The cavity is assumed to be cubic in geometry and the flow is laminar and incompressible. A direct numerical simulation is undertaken to investigate the flow structure, the heat transfer characteristics and the complex interaction between the induced stream flow at ambient temperature and the buoyancy-induced flow from the heated wall over a wide range of the Gras-hof number (10~3-10~6) and two Reynolds numbers Re = 100 and 1000. The computed thermal and flow fields are displayed and discussed in terms of the velocity fields, streamlines, the temperature distribution and the averaged Nusselt number at the heated and cooled walls. It is found that the flow becomes stable at moderate Grashof number and exhibit a three-dimensional structure, while for both high Reynolds and Grashof numbers the mixed convection effects come into play, push the recirculating zone further upstream and the flow becomes unsteady with Kelvin-Helmholtz instabilities at the shear layer.
机译：进行了数值研究，以分析位于水平通道底部的三维空腔上的混合对流流动的影响。空腔的垂直壁是等温的，其他所有壁都是绝热的。假定该腔在几何形状上是立方的，并且流动是层流且不可压缩的。直接数值模拟研究了在广泛的Gras-hof数范围内（10）的流动结构，传热特性以及环境温度下的诱导流与受热壁的浮力诱导流之间的复杂相互作用（10 〜3-10〜6）和两个雷诺数Re = 100和1000。显示的热流场和流场根据速度场，流线，温度分布以及加热和冷却壁的平均努塞尔数进行显示和讨论。已发现，在中等Grashof数时，流动变得稳定，并呈现三维结构，而对于高雷诺数和Grashof数，混合对流效应开始发挥作用，将再循环区域推向更上游，而开尔文-剪切层处的亥姆霍兹不稳定性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第22期|p.4797-4808|共12页
  • 作者

    Y. Stiriba; F.X. Grau; J.A. Ferre; A. Vernet;

  • 作者单位

    Universkat Rovira i Virgili, ETSEQ-DEM, Department of Mechanical Engineering, Av. Paisos Catalans 26, 43007 Tarragona, Spain;

    Universkat Rovira i Virgili, ETSEQ-DEM, Department of Mechanical Engineering, Av. Paisos Catalans 26, 43007 Tarragona, Spain;

    rnUniverskat Rovira I Virgili, ETSEQ-DEM, Department of Mechanical Engineering, Av. Paisos Catalans 26, 43007 Tarragona, Spain;

    rnUniverskat Rovira I Virgili, ETSEQ-DEM, Department of Mechanical Engineering, Av. Paisos Catalans 26, 43007 Tarragona, Spain;

  • 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

    mixed convection; direct numerical simulatior; open cavity; stability;

    机译：混合对流直接数值模拟;开腔稳定性;

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