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NUMERICAL STUDY ON TURBULENCE EFFECTS IN POROUS BURNERS

Volume 17, Edição 2, 2014, pp. 129-142
DOI: 10.1615/JPorMedia.v17.i2.40
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RESUMO

This paper presents numerical simulation of combustion of air/methane mixture in a cylindrical porous burner while the turbulence between the pores of porous medium has been considered via an explicit model. Results of both laminar and turbulence models are presented and compared for different equivalence ratios and several pore diameters. The turbulent kinetic energy increases along the burner due to the turbulence created by the solid matrix with a sudden jump at the flame front due to the thermal expansion. Also, because of the higher diffusion due to the turbulence, the reactants become more preheated, leading to an increase in the burning speed in comparison to the laminar results. Higher burning speed in turbulence cases decreases the flame temperature and shifts the maximum temperature location toward downstream of the burner. It is found that at higher equivalence ratios, the effects of turbulence become more significant. Taking into account the turbulence effects results in burning speeds which are in good agreement with the experimental data. Although the increase of pore diameter in the laminar model decreases the burning speed due to lower volumetric heat transfer between the phases, higher effective diffusion results in higher burning speed in the turbulence model.

CITADO POR
  1. Jouybari Nima Fallah, Maerefat Mehdi, Nimvari Majid Eshagh, A Macroscopic Turbulence Model for Reacting Flow in Porous Media, Transport in Porous Media, 106, 2, 2015. Crossref

  2. Nield Donald A., Bejan Adrian, Mechanics of Fluid Flow Through a Porous Medium, in Convection in Porous Media, 2017. Crossref

  3. Nield D. A., Simmons Craig T., A Brief Introduction to Convection in Porous Media, Transport in Porous Media, 130, 1, 2019. Crossref

  4. Klayborworn Santiphong, Pakdee Watit, Effects of porous insertion in a round-jet burner on flame characteristics of turbulent non-premixed syngas combustion, Case Studies in Thermal Engineering, 14, 2019. Crossref

  5. Wood Brian D., He Xiaoliang, Apte Sourabh V., Modeling Turbulent Flows in Porous Media, Annual Review of Fluid Mechanics, 52, 1, 2020. Crossref

  6. Kosari Erfan, Vafai Kambiz, Synthesis of Flow and Thermal Transport in Porous Media as Applied to Biological Applications, Journal of Heat Transfer, 143, 6, 2021. Crossref

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