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首页> 外文期刊>International Journal of Heat and Mass Transfer >Dynamic bubbling behaviors on a micro-orifice submerged in stagnant liquid
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Dynamic bubbling behaviors on a micro-orifice submerged in stagnant liquid

机译：停滞在液体中的微孔口上的动态起泡行为

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摘要

The dynamic bubbling behaviors in a bubble column with a micro-orifice of 54 urn in diameter are studied by visual experiments. The instant images are obtained by high-speed photographic technique. With the help of image processing, a real-time tracing is applied to the bubbles formation and motion, then the evolution of the bubbling features, including bubble size, shape and velocity are discussed. The bubbles steadily grow on the micro-orifice and the linear variations of the bubble radius, aspect ratio and velocity with the height are exhibited at a low gas flow rate. With the increase in the height, the bubble velocity reduces firstly and then turns to increase, while the bubble radius and aspect ratio appears a bifurcation structure. The effect of gas flow rate on bubbling behaviors is investigated and the fast Fourier transform is adopted to analyze the periodicity of the bubbling system. A critical gas flow rate(5.4 ml/ min)is found, at which the bubbling status turns from single bubbling to non-interval periodic bubbling.
机译：通过视觉实验研究了直径为54微米的微孔的鼓泡塔中的动态鼓泡行为。即时图像是通过高速摄影技术获得的。借助图像处理，将实时跟踪应用于气泡的形成和运动，然后讨论气泡特征（包括气泡大小，形状和速度）的演变。气泡在微孔口上稳定增长，并且气泡半径，长宽比和速度随高度的线性变化在低气体流速下表现出来。随着高度的增加，气泡的速度先减小然后增大，而气泡的半径和纵横比则呈现出分叉结构。研究了气体流量对鼓泡行为的影响，并采用快速傅立叶变换分析了鼓泡系统的周期性。发现临界气体流速（5.4 ml / min），在该流速下，鼓泡状态从单次鼓泡变为非间歇性周期性鼓泡。

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  • 作者

    Xun Zhu; Jian Xie; Qiang Liao; Rong Chen; Hong Wang;

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China,Room 421, College of Power Engineering, Chongqing University, Chongqing 400030, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China;

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China;

  • 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

    Bubbling on micro-orifice; Visual experiment; Real-time tracking; Bubbling periodicity;

    机译：在微孔上冒泡;视觉实验;实时跟踪;冒泡的周期性;

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