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A pore scale study on turbulent combustion in porous media

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Abstract

This paper presents pore scale simulation of turbulent combustion of air/methane mixture in porous media to investigate the effects of multidimensionality and turbulence on the flame within the pores of porous media. In order to investigate combustion in the pores of porous medium, a simple but often used porous medium consisting of a staggered arrangement of square cylinders is considered in the present study. Results of turbulent kinetic energy, turbulent viscosity ratio, temperature, flame speed, convective heat transfer and thermal conductivity are presented and compared for laminar and turbulent simulations. It is shown that the turbulent kinetic energy increases from the inlet of burner, because of turbulence created by the solid matrix with a sudden jump or reduction at the flame front due to increase in temperature and velocity. Also, the pore scale simulation revealed that the laminarization of flow occurs after flame front in the combustion zone and turbulence effects are important mainly in the preheat zone. It is shown that turbulence enhances the diffusion processes in the preheat zone, but it is not enough to affect the maximum flame speed, temperature distribution and convective heat transfer in the porous burner. The dimensionless parameters associated with the Borghi–Peters diagram of turbulent combustion have been analyzed for the case of combustion in porous media and it is found that the combustion in the porous burner considered in the present study concerns the range of well stirred reactor very close to the laminar flame region.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran

    N. F. Jouybari, M. Maerefat & M. E. Nimvari

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  1. N. F. Jouybari
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  2. M. Maerefat
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  3. M. E. Nimvari
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Correspondence to M. Maerefat.

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Jouybari, N.F., Maerefat, M. & Nimvari, M.E. A pore scale study on turbulent combustion in porous media. Heat Mass Transfer 52, 269–280 (2016). https://doi.org/10.1007/s00231-015-1547-x

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  • DOI: https://doi.org/10.1007/s00231-015-1547-x

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