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Numerical Prediction of Natural Convection in a Vertical Annulus Closed at Top and Opened at Bottom

机译：顶部封闭底部开口的垂直环空自然对流的数值预测

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摘要

A numerical prediction for natural convection flow in a vertical annulus closed at the top and opened at the bottom is presented. The outer cylindrical surface of the annulus is cooled to a low temperature, and a hot fluid is maintained below the open end temperature. The inner cylinder and the top wall of the annulus are insulated. The numerical technique used is a second-order accurate hybrid finite-element/finite-volume method. A pressure boundary condition at the opening in conjunction with an iterative scheme is employed to predict the regions of inflow and outflow and the velocity distributions. An in-house code developed has been validated by solving the natural convection through an open-ended vertical annulus. The characteristics of flow and heat transfer in the annulus are presented using contour plots of streamlines, isotherms, and isovorticities, and variations of velocity, volume rate of flow, Nusselt number, and temperature of adiabatic wall. Heat transfer through the annulus is subjected to sharp spatial variations due to the typical flow pattern at high values of Rayleigh number and is influenced by upstream conduction at low values of Rayleigh number. Correlations for average Nusselt number and volume rate of flow are obtained as functions of Rayleigh number (in the range of 10~3 to 10~5) and percentage gap ratio (from 2 to 20).
机译：提出了在顶部封闭，底部开放的垂直环空中自然对流流动的数值预测。环的外圆柱表面被冷却至低温，并且热流体保持在开口端温度以下。内圆柱体和环的顶壁是绝缘的。所使用的数值技术是二阶精确混合有限元/有限体积方法。在开口处的压力边界条件结合迭代方案被用来预测流入和流出的区域以及速度分布。通过使用开放式垂直环形空间解决自然对流，已验证了开发的内部代码。使用流线，等温线和等涡度的等高线图，以及绝热壁的速度，流量，努塞尔数和温度的变化，展示了环空中的流动和传热特性。由于在高瑞利数时的典型流动模式，通过环空的热传递会经历急剧的空间变化，并在低瑞利数时受到上游传导的影响。获得了平均努塞尔数与流量的相关性，作为瑞利数（在10〜3到10〜5的范围内）和百分比间隙比（从2到20）的函数。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|70-83|共14页
  • 作者

    S. ANIL LAL; V. ARUN KUMAR;

  • 作者单位

    Department of Mechanical Engineering, College of Engineering, Trivandrum, Kerala 695016, India;

    Department of Mechanical Engineering, College of Engineering, Trivandrum, Kerala, India;

  • 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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