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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental analysis of the effects of liquid phase surface tension on the hydrodynamics and mass transfer in a square bubble column
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Experimental analysis of the effects of liquid phase surface tension on the hydrodynamics and mass transfer in a square bubble column

机译：液相面张力对方形气泡塔流体动力学和传质的实验分析

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摘要

The effects of liquid surface tension were investigated on gas-liquid interfaces in bubbly flows through the analysis of hydrodynamic and mass transfer features. Tap water and aqueous solutions with two types of surfactant (cationic and anionic) are used as aqueous liquid phases. In fact, these surfactants are organic collectors consisting of an amine and ester. The influences of surfactant concentration and superficial gas velocity on the volumetric mass transfer coefficient and the gas hold-up were highlighted. The experimental findings revealed that although the two surfactants tested generated a decrease in surface tension, their effects on gas hold-up and flow regimes are very different. First, it was observed that the gas hold-up in amine aqueous solutions was very close to that in tap water, but it increased once the superficial gas velocity was above 7 cm.s~(-1). Conversely, the presence of ester decreased the overall gas hold-up since bubble net coalescence was enhanced, and the heterogeneous flow regime prevailed above 2.9 cm.s~(-1). Thus, the homogeneous regime prevailed with superficial gas velocity less than 4.4 cm.s~(-1) for tap water and amine aqueous solution, which corresponds to the transition point. Experimental findings exhibited also that the power spectral density of pressure fluctuations is a convenient tool to identify the prevailing flow regimes even in surfactant aqueous solutions. Besides that, both organic surfactants strongly reduced the volumetric mass transfer coefficient in comparison to tap water, mainly by inducing an additional resistance to gas-liquid mass transfer through interfacial adsorption for the cationic amine, but by promoting bubble coalescence for the anionic ester aqueous solution.
机译：研究了液体表面张力的效果在气液界面上，通过分析流体动力和传质特征来进行气液界面。用两种类型的表面活性剂（阳离子和阴离子）自来水和水溶液用作含水液相。实际上，这些表面活性剂是由胺和酯组成的有机收集器。突出了表面活性剂浓度和表面气体速度对体积传质系数和气体封闭的影响。实验结果表明，尽管测试了两种表面活性剂在表面张力下产生的降低，但它们对气体稳定和流动制度的影响非常不同。首先，观察到胺水溶液中的气体载体非常接近自来水中，但是一旦浅表气体速度高于7cm即〜（-1）。相反，由于增强了泡泡净聚结，酯的存在降低了整体气体升压，并且异质流动状态呈上3.9cm，〜（-1）。因此，用于自来水和胺水溶液的浅表气体速度小于4.4厘米厘米〜（-1），其对应于过渡点。实验结果也表现出压力波动的功率谱密度是即使在表面活性剂水溶液中识别普遍流动状态的方便工具。除此之外，两种有机表面活性剂与自来水相比，两种有机表面活性剂强烈地降低了体积传质系数，主要是通过诱导含有对阳离子胺的界面吸附的额外抗液体传质，而是通过促进阴离子酯水溶液的气泡聚结。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|121009.1-121009.13|共13页
  • 作者

    Sanaa Kouzbour; Bouchaib Gourich; Youssef Stiriba; Christophe Vial; Fabrice Gros; Rahmat Sotudeh-Gharebagh;

  • 作者单位

    Laboratoire d'Ingenierie des Procedes et d'Environnement (UPE) Ecole Supereure de Technologie - Universite Hassan Ⅱ de Casablanca Route d'EL Jadida Km 7 BP SOU Oasis Morocco Universite Clermont Auvergne CNRS SIGMA Clermont Institut Pascal Clermont-Ferrand F-63000 France;

    Laboratoire d'Ingenierie des Procedes et d'Environnement (UPE) Ecole Supereure de Technologie - Universite Hassan Ⅱ de Casablanca Route d'EL Jadida Km 7 BP SOU Oasis Morocco;

    ETSEQ Departement d'Enginyeria Mecanica Universitat Rovira i Virgili Av. Paisos Catalans 26 Tarragona 43007 Spain;

    Universite Clermont Auvergne CNRS SIGMA Clermont Institut Pascal Clermont-Ferrand F-63000 France;

    Universite Clermont Auvergne CNRS SIGMA Clermont Institut Pascal Clermont-Ferrand F-63000 France;

    Multiphase Systems Research Lab School of Chemical Engineering University of Tehran P.O. Box 11155/4563 Tehran Iran;

  • 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

    Bubble column; Gas-liquid interfaces; Surface tension; Gas hold-up; Flow regime transition; Bubble size; Mass transfer;

    机译：泡泡柱;气液界面;表面张力;气体持有;流动制度转换;泡沫尺寸;传质;

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