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首页> 外文期刊>International Journal of Heat and Fluid Flow >Gas-liquid flows in a microscale fractal-like branching flow network
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Gas-liquid flows in a microscale fractal-like branching flow network

机译：微小分形分支流网络中的气液流动

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摘要

Two-phase air-water flows in a microscale fractal-like flow network were experimentally studied and results were compared to predictions from existing macroscale void fraction correlations and flow regime maps. Void fraction was assessed using (1) two-dimensional analysis of high-speed images (direct method) and (2) experimentally determined using gas velocities (indirect method). Fixed downstream-to-upstream length and width ratios of 1.4 and 0.71, respectively, characterize the five-level flow network. Channels were fabricated in a 38 mm diameter silicon disk, 250 μm deep disk with a terminal channel width of 100 μm. A Pyrex top allowed for flow visualization. Superficial air and water velocities through the various branch levels were varied from 0.007 m/s to 1.8 m/s and from 0.05 m/s to 0.42 m/s, respectively. Two-phase flow regime maps were generated for each level of the flow network and are well predicted by the Taitel and Dukler model. Void fraction assessed using the indirect method shows very good agreement with the homogeneous void fraction model for all branch levels for the given range of flow conditions. Void fraction determined directly varies considerably from that assessed indirectly, showing better agreement with the void fraction correlation of Zivi.
机译：实验研究了微尺度分形流网络中的两相空气水流，并将结果与​​现有宏观尺度空分相关性和流态图的预测结果进行了比较。使用（1）高速图像的二维分析（直接方法）和（2）使用气体速度实验确定的（间接方法）评估空隙率。固定的上下游长宽比分别为1.4和0.71，是五级流动网络的特征。通道是在直径为38 mm的硅盘，深250μm的盘中制造的，其最终通道宽度为100μm。 Pyrex顶部允许进行流量可视化。通过不同分支水平的表面空气和水的速度分别从0.007 m / s至1.8 m / s和0.05 m / s至0.42 m / s。为流网的每个级别生成了两相流态图，并由Taitel和Dukler模型很好地进行了预测。对于给定的流动条件范围，对于所有分支水平，使用间接方法评估的空隙率均与均质空隙率模型非常吻合。直接测定的空隙率与间接测定的空隙率有很大差异，与Zivi的空隙率相关性更好。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2009年第5期|868-876|共9页
  • 作者

    Younghoon Kwak; Deborah Pence; James Liburdy; Vinod Narayanan;

  • 作者单位

    CAE Group, Corporate R&D Institute, Samsung Electro-Mechanics CO., Ltd., South Korea;

    Oregon State University, School of Mechanical Industrial and Manufacturing Engineering, 204 Rogers Hall, Corvallis, OR 97331-6001, USA;

    Oregon State University, School of Mechanical Industrial and Manufacturing Engineering, 204 Rogers Hall, Corvallis, OR 97331-6001, USA;

    Oregon State University, School of Mechanical Industrial and Manufacturing Engineering, 204 Rogers Hall, Corvallis, OR 97331-6001, USA;

  • 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
  • 中图分类
  • 关键词

    fractal; constructal; void fraction; microscale; heat transfer; two-phase;

    机译：分形建设性的空隙率微量;传播热量;两相;

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