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Experimental and numerical study of catalytic combustion and pore-scale numerical study of mass diffusion in high porosity fibrous porous media

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  • Namazi, Mohammadmehdi
  • Nayebi, Mohammadreza
  • Isazadeh, Amin
  • Modarresi, Ali
  • Marzbali, Iman Ghasemi
  • Hosseinalipour, Seyed Mostafa

Abstract

Pore structure has a significant effect on transport phenomena inside porous media. This effect can be considered in simulations by using suitable transport coefficients. Some correlations are reported in the literature, which can be applied for simple pore geometries. In the present study, a pore-scale simulation approach is presented to determine mass diffusion coefficient considering molecular and Knudsen diffusion in a fibrous porous medium as a complex porous geometry. The methodology is employed for species in catalytic combustion of Methane inside a fibrous porous structure. The effect of Solid Volume Fraction (SVF), fibers orientation, and diameter are discussed in different temperatures. It is found that SVF plays the dominant role in mass diffusion, specifically above 600K. Mass diffusion coefficients obtained in the present study and flow permeability, conduction and radiation heat transfer coefficients from the previous study are used to simulate methane combustion inside the fibrous structure on the macro scale. An experimental setup is developed for validation. The results indicated that the simulation could well predict the temperature distribution, also 6.4% error in estimating the Methane conversion rate was observed. Due to the low Peclet number, the concentration of CH4 and O2 decreased unexpectedly before entering the catalytic zone.

Suggested Citation

  • Namazi, Mohammadmehdi & Nayebi, Mohammadreza & Isazadeh, Amin & Modarresi, Ali & Marzbali, Iman Ghasemi & Hosseinalipour, Seyed Mostafa, 2022. "Experimental and numerical study of catalytic combustion and pore-scale numerical study of mass diffusion in high porosity fibrous porous media," Energy, Elsevier, vol. 238(PB).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pb:s036054422102079x
    DOI: 10.1016/j.energy.2021.121831
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    References listed on IDEAS

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    1. Zhang, Ruiyuan & Min, Ting & Chen, Li & Kang, Qinjun & He, Ya-Ling & Tao, Wen-Quan, 2019. "Pore-scale and multiscale study of effects of Pt degradation on reactive transport processes in proton exchange membrane fuel cells," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    2. Das, Prodip K. & Li, Xianguo & Liu, Zhong-Sheng, 2010. "Effective transport coefficients in PEM fuel cell catalyst and gas diffusion layers: Beyond Bruggeman approximation," Applied Energy, Elsevier, vol. 87(9), pages 2785-2796, September.
    3. He, Li & Fan, Yilin & Bellettre, Jérôme & Yue, Jun & Luo, Lingai, 2020. "A review on catalytic methane combustion at low temperatures: Catalysts, mechanisms, reaction conditions and reactor designs," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
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    1. Zhuang Kang & Zhiwei Shi & Jiahao Ye & Xinghua Tian & Zhixin Huang & Hao Wang & Depeng Wei & Qingguo Peng & Yaojie Tu, 2023. "A Review of Micro Power System and Micro Combustion: Present Situation, Techniques and Prospects," Energies, MDPI, vol. 16(7), pages 1-28, April.
    2. Qin, Mingyuan & Chew, Bee Teng & Yau, Yat Huang & Wang, Xinru & Wang, Chunqing & Luo, Xueqing & Li, Lei & Pan, Song, 2023. "Emergency heater based on gas-fired catalytic combustion infrared technology: Structure, evaluation and thermal response," Energy, Elsevier, vol. 274(C).

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