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首页> 外文期刊>Journal of Heat Transfer >Interaction of Asymmetric Films Around Boiling Cylinder Array: Homogeneous Interface to Chaotic Phenomenon
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Interaction of Asymmetric Films Around Boiling Cylinder Array: Homogeneous Interface to Chaotic Phenomenon

机译：沸腾圆柱阵列周围不对称薄膜的相互作用：混沌现象的同质界面。

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摘要

We report numerical study of film boiling around hot and horizontal cylinders in a saturated water pool to establish interfacial interactions leading toward dryout. Volume of fluid-based finite-volume discretization is performed in the domain for incorporation of source term in mass momentum and energy conservation equations due to phase change. At first, film boiling around single cylinder is simulated at different surface temperatures to understand unconstrained film growth and subsequent film bubble release due to buoyancy. Using velocity vectors and temperature contours, effect of film flow dynamics on bubble departure is depicted. This study has been extended further with multiple cylinders in three different stacking arrangements in order to understand the interaction of films in vicinity. Vertical interaction between cylinders leads to suppression of bubble release at the lower cylinder in comparison to the upper one. In the case of horizontal interactions, bubbles attract each other and merge, provided favorable pitch between cylinders and temperatures of the surfaces is maintained. Offset four cylinders stack maintaining vertical and horizontal pitch allows both lateral vapor affinity and bubble suppression in the lower most cylinder simultaneously. With time interaction of accumulated vapor films around cylinders hinders replenishment of fresh liquid to the hot surfaces leading toward chaotic phenomena or dryout in boiling heat transfer.
机译：我们报告了在饱和水池中围绕热缸和水平缸沸腾的薄膜沸腾的数值研究，以建立导致变干的界面相互作用。在域中执行基于流体的有限体积离散化，以将源项合并到由于相变而引起的质量动量和能量守恒方程中。首先，在不同的表面温度下模拟单个圆筒周围的薄膜沸腾，以了解不受约束的薄膜生长以及由于浮力而导致的随后的薄膜气泡释放。利用速度矢量和温度等高线，描绘了膜流动动力学对气泡离开的影响。为了进一步了解附近的胶片之间的相互作用，本研究进一步扩展了使用三个不同堆叠方式的多个滚筒的方法。汽缸之间的垂直相互作用导致下部汽缸与上部汽缸相比气泡释放受到抑制。在水平相互作用的情况下，只要保持圆柱体之间的有利间距和表面温度，气泡就会相互吸引并合并。偏移的四个汽缸堆保持垂直和水平间距，可同时在最下部的汽缸中实现侧向蒸气亲和力和气泡抑制。随着时间的流逝，汽缸周围积聚的蒸气膜会阻碍新鲜液体向热表面的补充，从而导致沸腾传热中的混乱现象或变干。

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  • 来源
    《Journal of Heat Transfer》 |2017年第4期|041502.1-041502.11|共11页
  • 作者

    Akash Deep; Chandan Swaroop Meena; Arup Kumar Das;

  • 作者单位

    Department of Mechanical and Industrial Engineering, IIT Roorkee, Roorkee 247667, India;

    CSIR-Central Building Research Institute, Roorkee 247667, India;

    Department of Mechanical and Industrial Engineering, IIT Roorkee, Roorkee 247667, India;

  • 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
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