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Enhanced Three-Dimensional Mixed Convection in a Horizontal Channel Using a Baffle

机译:使用挡板在水平通道中增强的三维混合对流

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摘要

Three-dimensional mixed convection inside a horizontal rectangular channel with a square heated surface on one of the vertical sidewalk and an infinitely thin baffle installed on the opposite insulated sidewall is numerically investigated. Attention is focused on the influence of the baffle position (-2 to 2), the inclination angle between the baffle and the horizontal (15° to 90°), and the baffle height (0.2 to 0.9) on the flow and thermal characteristics. The other parameters remain unchanged: the Reynolds number (100), Grashof number (50,000) and Prandtl number (0.71). The results show recirculation around the top portion of the heated surface due to strong buoyancy. The heat transfer depends strongly on the relative positions of the baffle and the recirculation. Heat transfer enhancement is obtained with a higher baffle and a larger inclination angle if the baffle is close to the cold main stream. In contrast, the average Nusselt number is slightly smaller if the baffle is surrounded by the recirculation than it is without the baffle. An accurate correlation is proposed for calculating the average Nusselt number over the investigated range of the baffle position and the inclination angle for a fixed baffle height (0.75).
机译:数值研究了水平矩形通道内部的三维混合对流,该矩形通道在垂直人行道之一上具有方形加热表面,并且在相对的绝缘侧壁上安装了无限薄的挡板。注意力集中在挡板位置(-2至2),挡板与水平面之间的倾斜角度(15°至90°)以及挡板高度(0.2至0.9)对流动和热特性的影响上。其他参数保持不变:雷诺数(100),格拉斯霍夫数(50,000)和普朗特数(0.71)。结果表明,由于强浮力,在受热表面顶部周围再循环。传热在很大程度上取决于挡板和再循环的相对位置。如果挡板靠近冷主流,则通过较高的挡板和较大的倾斜角可获得传热增强。相反,如果挡板被再循环包围,则平均Nusselt数要比没有挡板时的平均小。提出了一种精确的相关性,用于计算在固定的挡板高度(0.75)的挡板位置和倾斜角度范围内的平均Nusselt数。

著录项

  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1426-1435|共10页
  • 作者

    TSAI-SHOU CHANG;

  • 作者单位

    Institute of Mechanical & Electro-Mechanical Engineering, National Formosa University, Huwei, Yunlin 63208, Taiwan, Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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