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Effect of Buoyancy Ratio on Double-Diffusive Natural Convection in a Porous Rhombic Annulus

机译：浮力比对多孔菱形环空双扩散自然对流的影响

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摘要

This paper reports on the effect of buoyancy ratio due to both heat and mass transfer on natural convection in a porous enclosure between two isothermal concentric cylinders of rhombic cross sections. For negative values of the buoyancy ratio, buoyancy forces due to heat and mass transfer are in opposite directions (opposing mode), while for positive values they are in the same direction (aiding mode). Numerical results demonstrate that the flow strength increases as the absolute value of the buoyancy ratio increases. In the opposing mode, the eye of the vortex flow is located in the lower half of the enclosure, while in the aiding mode it is positioned in the upper part of the annulus. The average Nusselt and Sherwood number values increase as the absolute value of the buoyancy ratio moves away from 1, with values obtained in the aiding mode being higher than corresponding values achieved in the opposing mode. A comparison is also made between the computed average Nusselt and Sherwood number values and similar ones obtained in a circular annulus having the same inner and outer perimeters as the rhombic enclosure. Predictions indicate large percent difference in values, demonstrating that circular geometries cannot be exploited to accurately predict heat and mass transfer in complex geometries.
机译：本文报道了由于传热和传质引起的浮力比对菱形横截面的两个等温同心圆柱之间的多孔罩中自然对流的影响。对于浮力比的负值，由于热量和质量传递而产生的浮力是相反的方向（相对模式），而对于正值，它们的浮力是相同的方向（辅助模式）。数值结果表明，流动强度随着浮力比的绝对值的增加而增加。在反向模式下，涡流眼位于外壳的下半部，而在辅助模式下，涡流眼位于环空的上部。当浮力比的绝对值远离1时，平均Nusselt和Sherwood数值会增加，在辅助模式下获得的值要比在相反模式下获得的相应值高。还对计算出的平均努塞尔特数和舍伍德数值与在具有与菱形外壳相同的内周和外周长的圆形环中获得的相似值进行比较。预测表明值存在很大的百分比差异，这表明无法利用圆形几何形状来准确预测复杂几何形状中的热量和质量传递。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1371-1386|共16页
  • 作者

    FADL MOUKALLED; MARWAN DARWISH;

  • 作者单位

    Department of Mechanical Engineering, American University of Beirut, PO Box 11 -0236, Riad El Solh, Beirut 1107 2020, Lebanon;

    Department of Mechanical Engineering, American University of Beirut, Beirut, Lebanon;

  • 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
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