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Microscale Contacting of Two Immiscible Liquid Droplets to Measure Interfacial Tension

机译：两个不混溶液滴的微尺度接触以测量界面张力

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摘要

In various microfluidic devices, surface tension and interfacial tension values are necessary to analyze the fluid behavior in microchannels, and evaluating the values of interfacial tension is especially important for gas-liquid and liquid-liquid flows. A pendant drop method is commonly used to measure the interfacial tension value; however, the pendant drop method requires strict accuracy in measuring the droplet size when the droplet has a nonspherical shape, as well as an accurate value of the density difference between the two liquids. In this work, a new measurement method called the "liquid bridge-inducing microscale contact method" has been developed in which the interfacial tension can be obtained from the bridging of two liquid droplets extruded from opposing ends of glass capillary tubes or formed on the ends of round metal rods. By measuring the radii of curvature of each liquid surface and interface, we calculate the Laplace pressure on the surface and interface, and derive the interfacial tension value using the Laplace equation. The results show that the values of interfacial tension obtained from the two methods are approximately the same and that the liquid bridge-inducing microscale contact method is capable of accurate interfacial tension measurements.
机译：在各种微流体装置中，需要表面张力和界面张力值来分析微通道中的流体行为，并且评估界面张力值对于气-液和液-液流动特别重要。悬垂法通常用于测量界面张力值。然而，悬滴法要求在液滴具有非球形形状时测量液滴尺寸的严格准确性，以及两种液体之间的密度差的准确值。在这项工作中，已经开发出一种称为“液桥诱导微尺度接触法”的新测量方法，其中可以通过桥接从玻璃毛细管相对两端挤出或形成在两端的两个液滴来获得界面张力。圆的金属棒。通过测量每个液体表面和界面的曲率半径，我们可以计算表面和界面上的拉普拉斯压力，并使用拉普拉斯方程得出界面张力值。结果表明，两种方法获得的界面张力值大致相同，并且液桥诱导微尺度接触法能够准确测量界面张力。

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  • 来源
    《Heat Transfer Engineering》 |2013年第3期|113-119|共7页
  • 作者

    YUICHI SHIBATA; TAKEHIKO YANAI; OSAMU OKAMOTO; MASAHIRO KAWAJI;

  • 作者单位

    Department of Mechanical Systems Engineering, Ibaraki National College of Technology, Hitachinaka City, Ibaraki, Japan;

    Department of Mechanical Systems Engineering, Ibaraki National College of Technology, Hitachinaka City, Ibaraki, Japan;

    Department of Electronics and Control Engineering, Ibaraki National College of Technology, Hitachinaka City, Ibaraki, Japan;

    Department of Mechanical Engineering, City College of New York, Convent Avenue at 140th Street, New York, NY 10031, USA,Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Ontario, Canada;

  • 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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