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Numerical Simulation of Solid Combustion in Microporous Particles.

Gérald Debenest1, Romain Guibert1, Pierre Horgue1

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This study simulates smoldering combustion in porous cylinders using direct numerical simulations. The Darcy-Brinkman model effectively captures multicomponent, dilatable flows and combustion within porous particles.

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Area of Science:

  • Multiphase flow
  • Combustion science
  • Porous media physics

Background:

  • Smoldering combustion in porous materials is complex, involving multicomponent and dilatable flows.
  • Understanding this process is crucial for fire safety and material science.
  • Previous models often simplify the multi-scale nature of reactions within porous grains.

Purpose of the Study:

  • To perform direct numerical simulations of smoldering in simplified geometries.
  • To investigate the behavior of multicomponent and dilatable flows during combustion.
  • To evaluate the efficacy of the Darcy-Brinkman model for porous particle combustion.

Main Methods:

  • Direct numerical simulations (DNS) were employed.
  • A Darcy-Brinkman model was defined to handle multi-scale phenomena.
  • Simulations involved single-step chemical reactions within porous grains.
  • Parametric studies varied flow rate and carbon content.

Main Results:

  • The Darcy-Brinkman model demonstrated the ability to capture smoldering phenomena in porous particles.
  • Model sensitivity to inner grain permeability was investigated.
  • Simulations explored the response to variations in flow rate and carbon content.

Conclusions:

  • The Darcy-Brinkman approach is a viable tool for simulating smoldering in porous media.
  • Further validation against experimental data is warranted.
  • The study provides insights into the complex interplay of flow and reaction in porous particle combustion.