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首页> 外文期刊>International Journal of Heat and Mass Transfer >Conjugate heat transfer analysis of liquid-vapor two phase flow in a microtube: A numerical investigation
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Conjugate heat transfer analysis of liquid-vapor two phase flow in a microtube: A numerical investigation

机译：微管中气液两相流的共轭传热分析：数值研究

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摘要

Flow boiling in microchannel is a promising way of high heat flux removal. In account of this, numerous experimental and numerical studies have been performed on flow boiling in conventional as well as in microchannels focusing on heat transfer, bubble dynamics and flow pattern while studies on conjugate heat transfer in flow boiling are yet to be explored. This work presents a systematic three-dimensional numerical study of conjugate effect of heat transfer in two-phase flow in a microtube subjected to constant wall heat flux. Volume of fluid (VOF) model along with phase change model are used to capture bubble shape and flow pattern. Water enters the microtube at a temperature of 300 K. The effect of (i) wall to fluid conductivity ratio (k(sf)), (ii) wall thickness to inner radius ratio (delta(sf)), and (iii) inlet mass flux (G) in unsteady flow boiling condition are explored. Transformation of nucleating bubbles into elongated bubbles are characterised in terms of wall thickness (delta(sf)) and its material conductivity (k(sf)). The results indicate that bubble length increases with increasing wall material conductivity but decreases with increasing wall thickness as well as mass flux. Growth and motion of vapor bubbles due to phase change are also explored. Comparison between single and two-phase flow under conjugate heat transfer scenario is also discussed. (C) 2019 Elsevier Ltd. All rights reserved.
机译：微通道中的流沸腾是去除高热通量的有前途的方式。有鉴于此，在常规以及微通道中对流沸腾进行了大量的实验和数值研究，重点是传热，气泡动力学和流型，而对流沸腾中共轭传热的研究尚待探索。这项工作提出了一个系统的三维数值研究，研究了在恒定壁热通量下微管中两相流中传热的共轭效应。流体体积（VOF）模型以及相变模型用于捕获气泡形状和流动模式。水在300 K的温度下进入微管。（i）壁与流体电导率之比（k（sf）），（ii）壁厚与内半径之比（delta（sf））和（iii）入口的影响探索了非稳态沸腾条件下的质量通量（G）。成核气泡向细长气泡的转化以壁厚（delta（sf））和其材料电导率（k（sf））为特征。结果表明，气泡长度随壁材料电导率的增加而增加，但随壁厚和质量通量的增加而减小。还研究了由于相变而产生的气泡的增长和运动。还讨论了在共轭传热情况下单相和两相流的比较。 （C）2019 Elsevier Ltd.保留所有权利。

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