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Experimental Investigation of Inertial Mixing in Colliding Droplets

机译：碰撞液滴惯性混合的实验研究

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摘要

Achieving the increasingly fast mixing requirements posed by the chemical, biological, and life science community for confined microchannel droplet flows remains an engineering challenge. The viscous and surface tension forces that often dominate microflows undermine fast, efficient mixing. A novel mixing arrangement based on droplet collisions has been developed that significantly improves mixing rates by utilizing inertia to rapidly rearrange fluid contents. This article experimentally investigates inertial droplet mixing in micro-flows following high-speed droplet pair collisions. The technique utilizes a gaseous flow for liquid droplet generation and transport with collisions occurring in Y-junction microchannel geometries. Mixing rates are quantified using differential fluorescent optical diagnostics, custom image processing algorithms, and statistical analysis. Measured droplet mixing times are compared to the characteristic time scales for mass and viscous diffusion and bulk convective transport. Results show that mixing times are decreased as the droplet pair collision inertia is increased, indicating the potential benefit for inertial collision mixing.
机译：实现化学，生物学和生命科学界对密闭微通道液滴流动提出的越来越快的混合要求仍然是工程上的挑战。通常在微流中占主导地位的粘性和表面张力会破坏快速，有效的混合。已经开发出一种基于液滴碰撞的新型混合装置，该装置通过利用惯性快速重新排列流体含量，显着提高了混合速率。本文通过实验研究了高速液滴对碰撞后微流中的惯性液滴混合。该技术利用气体流来产生液滴并与Y结微通道几何形状中发生的碰撞进行运输。使用差分荧光光学诊断，自定义图像处理算法和统计分析来量化混合速率。将测得的液滴混合时间与质量和粘性扩散以及整体对流传输的特征时间标度进行比较。结果表明，随着液滴对碰撞惯性的增加，混合时间减少，表明惯性碰撞混合具有潜在的好处。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|120-130|共11页
  • 作者

    BRIAN CARROLL; CARLOS HIDROVO;

  • 作者单位

    Mechanical Engineering Department, The University of Texas at Austin, Austin, Texas, USA;

    Mechanical Engineering Department, Multiscale Thermal Fluids Laboratory, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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