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首页> 外文期刊>Applied Mathematical Modelling >Spreading and rebound dynamics of sub-millimetre urea-water-solution droplets impinging on substrates of varying wettability
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Spreading and rebound dynamics of sub-millimetre urea-water-solution droplets impinging on substrates of varying wettability

机译：亚毫米尿液水溶液液滴的扩散和反弹动力学，施加不同润湿性基板的底层

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摘要

The interaction of droplets consisting of urea-water solution (UWS) with a wall is of interest for automotive exhaust gas after-treatment of Diesel engines by selective catalytic reduction (SCR). Since the impingement of tiny UWS droplets on the solid substrate is difficult to examine experimentally, little is known about the detailed dynamics of this process. In the present study, the normal impact of single UWS droplets impinging on dry solid substrates of greatly differing wettability is investigated numerically under axisymmetric conditions. Simulations are performed by a diffuse interface phase-field solver developed by the authors where the coupled Cahn-Hilliard Navier-Stokes equations are solved using OpenFOAM. The code is thoroughly validated against a number of experiments from literature considering the rebound of millimetre-sized water droplets from hydrophobic substrates. The numerical simulations on the impact dynamics of UWS droplets cover wide ranges of sub-millimetre droplet sizes and impact velocities that are relevant in technical SCR systems. A strong influence of substrate wettability on droplet dynamics is identified. Reducing wettability from hydrophilic to superhydrophobic conditions reduces spreading and enables drop rebound with reduced drop-surface contact time. The effects of drop diameter, drop impact velocity and equilibrium contact angle on the maximum spreading ratio are quantified, and regime maps on rebound versus non-rebound (deposition) impact outcomes are provided. The results of the present interface-resolving numerical simulations may be useful for development of more advanced drop-wall interaction models as they are required in CFD codes relying on the Euler-Lagrange approach for large-scale computations of UWS sprays.
机译：通过选择性催化还原（SCR）将尿素水溶液（UWS）组成的尿素水溶液（UWS）组成的尿素水溶液（UWS）组成的相互作用对柴油发动机的柴油发动机的汽车废气感兴趣。由于在实验上难以在实验上检查的微小UWS液滴，因此关于该过程的详细动态知之甚少。在本研究中，在轴对称条件下，在轴对称条件下在数值上进行单个UWS液滴对抗在干燥固体基板上的单个UWS液滴的正常影响。模拟由由作者开发的漫反射接口阶段求解器进行，其中耦合的CAHN-Hilliard Navier-Stokes方程使用OpenFoam解决。考虑到疏水基材的毫米尺寸的水滴反弹，根据文献的许多实验彻底验证了该代码。 UWS液滴冲击动力学的数值模拟涵盖技术SCR系统相关的亚毫米液滴尺寸和冲击速度范围。鉴定了底液体动力学对底物润湿性的强烈影响。减少亲水性对超疏水性条件的润湿性减少了扩散，并且可以降低落下表面接触时间的倒置。滴直径，下降冲击速度和平衡接触角对最大扩散比的影响是量化的，并且提供了反弹与非反弹（沉积）冲击结果的制度映射。本界面解决数值模拟的结果对于开发更先进的丢弃墙交互模型可能是有用的，因为它们需要在CFD代码中依赖于欧拉拉格兰·拉格朗曼·普通喷射的大规模计算。

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  • 来源
    《Applied Mathematical Modelling》 |2021年第7期|53-73|共21页
  • 作者

    Martin Woerner; Nima Samkhaniani; Xuan Cai; Yanchen Wu; Arijit Majumdar; Holger Marschall; Bettina Frohnapfel; Olaf Deutschmann;

  • 作者单位

    Institute of Catalysis Research and Technology Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany;

    Institute of Fluid Mechanics Karlsruhe Institute of Technology (KIT) Kaiserstr.10 Karlsruhe 76131 Germany;

    Institute of Fluid Mechanics Karlsruhe Institute of Technology (KIT) Kaiserstr.10 Karlsruhe 76131 Germany Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr.20 76131 Karlsruhe Germany;

    Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr.20 76131 Karlsruhe Germany Karlsruhe Institute of Technology (KIT) Institute of Applied Materials Science Strasse am Forum 7 76131 Karlsruhe Germany;

    Institute of Catalysis Research and Technology Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany;

    Computational Multiphase Flows Technical University Darmstadt Alarich-Weiss-Strasse 10 64287 Darmstadt Germany;

    Institute of Fluid Mechanics Karlsruhe Institute of Technology (KIT) Kaiserstr.10 Karlsruhe 76131 Germany;

    Institute of Catalysis Research and Technology Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr.20 76131 Karlsruhe Germany;

  • 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

    Drop bouncing; Drop impact dynamics; Phase field method; Selective catalytic reduction; Urea-water solution;

    机译：下降弹跳;放弃影响动态;相场法;选择性催化还原;尿素水溶液;

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