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This chapter deals with the effects of the presence of particle clusters in fluid-particle flow modeling and numerical simulation. This chapter also introduces key concepts and the fundamental derivations of two approaches for considering the presence of clusters: the subgrid model and the energy minimization model. The minimum rate of energy dissipation (MRED) is proposed as the criterion for the identification of clusters in the grids, called the grid stability condition. Using these approaches, the predicted spatio-temporal evolution of particle clusters is of particular interest in the design and scale-up of gas–solid circulating fluidized beds.

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Minimum Rate of Energy Dissipation and Interfacial Momentum Closure of Heterogeneous Flow Structures

  • 章节

  • 发表日期：

    2025年

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  • Huilin Lu,
  • Guodong Liu,
  • Qinghong Zhang,
  • Xiaoxue Jiang,
  • Boxue Pang,
  • Wenjian Cai

摘要

This chapter deals with the effects of the presence of particle clusters in fluid-particle flow modeling and numerical simulation. This chapter also introduces key concepts and the fundamental derivations of two approaches for considering the presence of clusters: the subgrid model and the energy minimization model. The minimum rate of energy dissipation (MRED) is proposed as the criterion for the identification of clusters in the grids, called the grid stability condition. Using these approaches, the predicted spatio-temporal evolution of particle clusters is of particular interest in the design and scale-up of gas–solid circulating fluidized beds.