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Heat Transfer Reduction due to a Ceiling-Mounted Barrier in an Enclosure with Natural Convection

机译：在自然对流的外壳中，由于安装了天花板的障碍物，减少了传热

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摘要

$1Department of Mechanical Engineering, Izmir Institute of Technology, Izmir, Turkey$2Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig, Turkey$3Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia; ; Effects of a ceiling-mounted barrier on natural convection heat transfer in a square cavity with differentially heated wall are numerically investigated. A limit case, in which the partition has small thickness and low thermal conductivity, is studied. The study is performed for nine different locations of barrier on the ceiling, two different lengths of barrier as 15 and 50% of the side wall, and Rayleigh numbers from 10~3 to 10~6. The vorticity and streamfunction approach is used to obtain velocity distribution, and the energy equation is solved to determine temperature field in the cavity. The variations of the local Nusselt number on the hot and cold walls and the change of mean Nusselt number with the location of barrier in the cavities with different Rayleigh numbers are presented. The obtained results show that a wall-mounted barrier can be used to reduce heat transfer rate through the cavity; however, its effectiveness depends on length and location of barrier and Rayleigh number.
机译：$ 1土耳其伊兹密尔伊兹密尔理工学院机械工程系$ 2土耳其埃拉泽菲拉特大学技术学院机械工程系$ 3沙特阿拉伯利雅得沙特国王沙特大学工程学院机械工程系$ 3 ;数值研究了壁挂式吊顶对壁温差的方腔中自然对流换热的影响。研究了隔板的厚度小，导热系数低的极限情况。该研究针对天花板上九个不同位置的障碍物，两个不同长度的障碍物（分别为侧壁的15％和50％）和瑞利数（从10〜3到10〜6）进行。使用涡度和流函数方法获得速度分布，并求解能量方程以确定空腔中的温度场。给出了热瑞尔冷壁上局部努塞尔特数的变化以及在不同瑞利数的空洞中平均努塞尔特数随势垒位置的变化。获得的结果表明，可以使用壁装式壁障来降低通过空腔的传热速率。然而，其有效性取决于屏障的长度和位置以及瑞利数。

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  • 来源
    《Heat Transfer Engineering》 |2011年第6期|p.429-438|共10页
  • 作者

    GAMZE GEDIZ ILIS; MOGHTADA MOBEDI; HAKAN F. ÖZTOP;

  • 作者单位

    Department of Mechanical Engineering, Izmir Institute of Technology, Izmir, Turkey;

    Department of Mechanical Engineering, Izmir Institute of Technology, Izmir, Turkey;

    Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig, Turkey Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia;

  • 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);
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  • 正文语种 eng
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