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Modeling of Heat Transfer Mechanism in Porous Media Combustion Chamber

Arzhangnia, Yousef | 2007

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47180 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghafourian Morshed Yazdi, Akbar; Saeedi, Mohammad Hassan
  7. Abstract:
  8. Combustion procedure in porous media is of great importance and also has numerous technical applications. Currently several usages of porous burners in thermodynamic engineering and thermal industries have been identified, in which they perform based on stabilized combustion in porous media. Among the advantages that porous burners have over conventional burners are pollution reduction, decrease in burner dimension, enhanced flame stabilization and also noise reduction.
    According to physical and chemical attributes of porous material, combustion can occur in one of the three main types of media including: inert, catalytic, combustible. The concepts mentioned in this proposal are concentrated on combustion in inert porous media, which can be classified as heat recirculating combustion systems. In what follows, heat-recirculating combustion systems are defined as all those devices in which the reactants are preheated using heat "borrowed" from beyond the flame zone, without mixing the two streams; this is illustrated in Figure 1 for a premixed adiabatic system.
    The most fundamental parameter which indicates the flammability in a porous burners is critical pore cavity size. If the size of the pore is less than critical amount, the flame cannot penetrate in the media and quenches. Babkin and his colleague’s experiments set a confining limit based on Peclet number as follows:
    Pe=(S_L d_m ρc_p)/k>65
    In the above equation, S_L represents the laminar flame velocity while d_m shows the equivalent pore diameter and ρ, c_p and k are density, specific heat and thermal conductivity respectively
  9. Keywords:
  10. Combustion ; Porous Media ; Flame Stabilization ; Porous Media Burner ; Peclet Number

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