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首页> 外文期刊>Applied Mathematical Modelling >Mathematical modeling of catalytic wet oxidation in trickle-bed reactors by a diffusion-convection-reaction approach embedded with an interstitial CFD framework
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Mathematical modeling of catalytic wet oxidation in trickle-bed reactors by a diffusion-convection-reaction approach embedded with an interstitial CFD framework

机译：嵌入间质CFD框架的扩散-对流-反应方法在滴流床反应器中催化湿式氧化的数学模型

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摘要

In this work, we propose a diffusion-convection-reaction methodology to gain further insights into the heterogeneous multiphase flow of trickle beds. Our case-study encompasses a multi-fluid model embedded within an interstitial framework on the numerical simulation of continuous catalytic wet oxidation of hazardous compounds. First, with the proviso that phase holdup, pressure drop, and liquid distribution are fundamental criteria for the efficient design of trickle beds, the multiphase flow constitutive equations have been developed and solved by the conservative unstructured finite volume method. Second, several numerical variables were parametrically optimized based on the application of different under-relaxation parameters, mesh densities, and time stepping strategies. The segregated solver has been found to reveal good properties in terms of convergence and stability criteria, which endorsed the further corroboration. Finally, this theoretical probing-sensing scheme enabled the characterization of liquid flow texture accomplished by three-dimensional flow patterns exposing their deviation from ideal plug flow. The diffusion-convection-reaction framework coupled within a CFD model can then be further exploited on the simulation of complex multiphase reactive flows with adjustable parameters.
机译：在这项工作中，我们提出了一种扩散-对流-反应方法，以进一步了解滴流床的非均相多相流。我们的案例研究包括一个嵌入在间隙框架中的多流体模型，该模型是对有害化合物进行连续催化湿式氧化的数值模拟。首先，条件是相持率，压降和液体分布是滴流床高效设计的基本标准，因此，通过保守的非结构化有限体积方法建立并求解了多相流本构方程。其次，根据不同的欠松弛参数，网格密度和时间步长策略的应用，对几个数值变量进行了参数优化。已发现隔离的求解器在收敛性和稳定性标准方面显示出良好的属性，这支持了进一步的佐证。最终，这种理论上的探测方案使得能够表征液体流动结构，该结构由三维流动模式实现，从而揭示了它们与理想塞流的偏差。然后可以在具有可调参数的复杂多相反应性流的仿真中进一步利用CFD模型中耦合的扩散-对流-反应框架。

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  • 来源
    《Applied Mathematical Modelling》 |2012年第10期|p.4634-4651|共18页
  • 作者

    Rodrigo J.G. Lopes; M.L.N. Perdigoto; Rosa M. Quinta-Ferreira;

  • 作者单位

    CIEPQPF - Centra de Investigacao em Engenharia dos Processos Quimicos e Produtos da Floresta, CERSE - Croup on Environmental, Reaction and Separation Engineering, Department of Chemical Engineering, University of Coimbra Rua Silvio Lima, Polo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal;

    CIEPQPF - Centra de Investigacao em Engenharia dos Processos Quimicos e Produtos da Floresta, CERSE - Croup on Environmental, Reaction and Separation Engineering, Department of Chemical Engineering, University of Coimbra Rua Silvio Lima, Polo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal;

    CIEPQPF - Centra de Investigacao em Engenharia dos Processos Quimicos e Produtos da Floresta, CERSE - Croup on Environmental, Reaction and Separation Engineering, Department of Chemical Engineering, University of Coimbra Rua Silvio Lima, Polo II - Pinhal de Marrocos, 3030-790 Coimbra, Portugal;

  • 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

    computational fluid dynamics; trickle-bed reactor; multiphase flow; catalytic wet oxidation; total organic carbon; temperature;

    机译：计算流体动力学;滴流床反应器;多相流催化湿式氧化总有机碳;温度;

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