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首页> 外文期刊>International Journal of Heat and Mass Transfer >Formation and breakup of compound pendant drops at the tip of a capillary and its effect on upstream velocity fluctuations
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Formation and breakup of compound pendant drops at the tip of a capillary and its effect on upstream velocity fluctuations

机译：复合悬垂液滴在毛细管尖端的形成和破裂及其对上游速度波动的影响

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摘要

In this paper, the formation and breakup process of compound pendant drops (CPDs, pendant drops with smaller drops or bubbles in them) at the tip of a glass capillary and its effect on upstream velocity fluctuation are experimentally investigated. The formation process of an air/water compound drop from a CPD consists of four main stages. First, an air plug in the capillary flows into the small liquid pendant drop to initialize a small CPD. Next, a liquid slug flows into the CPD, and the liquid in the CPD accumulates. Subsequently, an air plug flows into the CPD, and it coalesces with the existing air bubble in the CPD. The accumulation and coalescence stages repeat, until the CPD reaches a critical weight, then the CPD finally breaks up to produce a compound drop. For the air/SDS-solution system, the bubbles in the CPDs do not coalesce, and the contact line of the CPDs initially climbs along the capillary and then moves downwards with the growth of the CPDs. The upstream velocity fluctuates during the periodical formation and breakup of the CPD due to Laplace pressure variation at the tip of the glass capillary. By adding surfactant into water, the fluctuation of the upstream velocity decreases. The size distribution of the compound drops produced by the breakup of CPDs is quantified, and the results show that the current system is able to produce monodisperse compound drops.
机译：本文研究了玻璃毛细管尖端复合悬垂液滴（CPD，悬垂液滴中具有较小液滴或气泡）的形成和破裂过程及其对上游速度波动的影响。 CPD中空气/水化合物液滴的形成过程包括四个主要阶段。首先，毛细管中的空气塞流入小悬液液滴以初始化小CPD。接下来，液体团块流入CPD，并且CPD中的液体积聚。随后，空气塞流入CPD，并与CPD中现有的气泡聚结。重复积累和合并阶段，直到CPD达到临界重量，然后CPD最终分解以产生复合液滴。对于空气/ SDS溶液系统，CPD中的气泡不会聚结，并且CPD的接触线首先沿毛细管上升，然后随着CPD的生长而向下移动。由于玻璃毛细管尖端的拉普拉斯压力变化，在CPD的周期性形成和破裂过程中，上游速度会波动。通过将表面活性剂添加到水中，上游速度的波动减小。量化了CPD分解产生的化合物液滴的尺寸分布，结果表明当前系统能够产生单分散的化合物液滴。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第4期|p.1022-1029|共8页
  • 作者

    Zhizhao Che; Teck Neng Wong; Nam-Trung Nguyen; J.C. Chai;

  • 作者单位

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    Department of Mechanical Engineering, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates;

  • 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

    compound pendant drop; breakup; velocity fluctuation; compound drops; droplet-based microfluidics;

    机译：复合悬垂液滴;破裂;速度波动;复合液滴;基于液滴的微流体;

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