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首页> 外文期刊>International Journal of Heat and Mass Transfer >Adiabatic two-phase flow in rectangular microchannels with different aspect ratios: Part Ⅱ - bubble behaviors and pressure drop in single bubble
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Adiabatic two-phase flow in rectangular microchannels with different aspect ratios: Part Ⅱ - bubble behaviors and pressure drop in single bubble

机译：纵横比不同的矩形微通道中的绝热两相流：第二部分-单气泡的气泡行为和压降

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摘要

One of the major flow patterns in a microchannel is an elongated bubble flow, which is similar to a long slug bubble. Behaviors and pressure drop for a single bubble in a rectangular microchannel were studied. Based on the experiments in Part I of this paper, data for liquid superficial velocities of 0.06-0.8 m/s, gas superficial velocities of 0.06-0.66 m/s and AR of 0.92, 0.67, 0.47 and 0.16 were analyzed. The velocity, length, number, and frequency of the single bubble in the rectangular microchannel were obtained from image processing based on a unit cell model. The bubble velocities were proportional to total superficial velocity. As the aspect ratio decreased, the portion of the bubble area increased due to the corner effect. New correlation of the bubble velocity for different aspect ratio was proposed. Also, bubble and liquid slug length, the number of the unit cell and bubble frequency were analyzed with different aspect ratios. The pressure drop for the single bubble in the rectangular microchannels was evaluated using the information of the bubble behavior. The pressure drop in the single elongated bubble was proportional to the bubble velocity. The pressure drop in the single elongated bubble in the rectangular microchannel increased as the aspect ratio decreased.
机译：微通道中的主要流动方式之一是细长的气泡流，类似于长条形气泡。研究了矩形微通道中单个气泡的行为和压降。基于本文第一部分的实验，分析了液体表观速度为0.06-0.8 m / s，气体表观速度为0.06-0.66 m / s和AR为0.92、0.67、0.47和0.16的数据。矩形微通道中单个气泡的速度，长度，数量和频率是通过基于晶胞模型的图像处理获得的。气泡速度与总表面速度成正比。随着长宽比的减小，气泡区域的一部分由于拐角效应而增大。提出了不同纵横比下气泡速度的新关系。另外，以不同的长宽比分析了气泡和液体团块的长度，晶胞的数量和气泡频率。使用气泡行为信息评估矩形微通道中单个气泡的压降。单个细长气泡中的压降与气泡速度成正比。随着纵横比的减小，矩形微通道中单个细长气泡中的压降增加。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第24期|p.5242-5249|共8页
  • 作者

    C.W. Choi; D.I. Yu; M.H. Kim;

  • 作者单位

    Department of Mechanical Engineering. Pohang University of Science and Technology, Pohang, San 31, Hyoja Dong 790-784, Republic of Korea;

    rnDepartment of Mechanical Engineering. Pohang University of Science and Technology, Pohang, San 31, Hyoja Dong 790-784, Republic of Korea;

    rnDepartment of Mechanical Engineering. Pohang University of Science and Technology, Pohang, San 31, Hyoja Dong 790-784, Republic of Korea;

  • 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

    microchannel; aspect ratio; bubble; unit cell model;

    机译：微通道长宽比气泡;晶胞模型;

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