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Falling film hydrodynamics of black liquor under evaporative conditions

机译：黑液在蒸发条件下的降膜流体动力学

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摘要

Bubbles were observed in a thin, evaporating, falling film of black liquor (a fluid mixture generated during the pulp production) on the exterior wall of a research evaporator. Because the presence of bubbles could not be explained by nucleate boiling, a combination of turbulent vapour entrainment and effects due to surface-active compounds - surfactants - is proposed. Black liquor contains numerous surfactants, which are likely to enhance bubble formation and stabilization in the fluid and on the film interface. One observed important effect of bubble formation was fluid loss due to bubble-bursting aerosolization (sputtering). Also, bubbles and bubble processes probably alter the film velocity-profile and heat transfer resistance, thereby affecting heat transfer across the film and hence evaporator efficiency.
机译：在研究用蒸发器的外墙上，黑液（在纸浆生产过程中产生的流体混合物）的蒸发薄膜中观察到了气泡。因为不能用成核沸腾来解释气泡的存在，所以提出了湍流蒸汽夹带和表面活性剂表面活性剂的影响的组合。黑液包含许多表面活性剂，它们可能会增强气泡的形成以及在流体中和薄膜界面上的稳定性。观察到的气泡形成的重要作用之一是由于气泡破裂雾化（溅射）而造成的流体损失。同样，气泡和气泡过程可能会改变薄膜的速度分布和传热阻力，从而影响整个薄膜的传热，从而影响蒸发器的效率。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2009年第12期|2769-2778|共10页
  • 作者

    M. Johansson; I. Leifer; L. Vamling; L. Olausson;

  • 作者单位

    Heat and Power Technology, Department of Energy and Environment, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    Marine Sciences Institute and The Institute for Crustal Studies, University of California, Santa Barbara, CA 93106-5080, USA;

    Heat and Power Technology, Department of Energy and Environment, Chalmers University of Technology, SE-412 96 Goeteborg, Sweden;

    Metso Power AB, Box 8734, SE-402 75, Goeteborg, Sweden;

  • 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

    black liquor; evaporator; falling film; surfactants; bubbles;

    机译：黑液蒸发器落膜表面活性剂气泡;

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