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Related Experiment Video

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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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Pair dispersion of turbulent premixed flame elements.

Swetaprovo Chaudhuri1

  • 1Department of Aerospace Engineering, National Center for Combustion Research and Development, Indian Institute of Science, Bangalore 560012, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 14, 2015
PubMed
Summary

This study examines flame particle dispersion in turbulent premixed flames. Flame particle pair separation follows a modified scaling law, with the constant depending on isosurface temperature.

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Area of Science:

  • Combustion Science
  • Turbulence
  • Fluid Dynamics

Background:

  • Flame particles are defined as mathematical points moving with a reacting isoscalar surface in premixed flames.
  • Understanding particle dispersion is crucial for modeling turbulent combustion processes.
  • Previous work often focused on fluid particle dispersion, necessitating a specific analysis of flame particle behavior.

Purpose of the Study:

  • To investigate the mean square pair separation of flame particles over time.
  • To determine if flame particle dispersion follows established scaling laws, like Batchelor's scaling.
  • To analyze the factors influencing the proportionality constant in flame particle dispersion.

Main Methods:

  • Utilized direct numerical simulation (DNS) of hydrogen-air turbulent premixed flames with detailed chemical kinetics.
  • Tracked the positions of flame particles comoving with a specific isoscalar surface.
  • Analyzed the mean square pair separation of these flame particles as a function of time.

Main Results:

  • Flame particle pair dispersion was found to follow a modified Batchelor's scaling law: 〈|Δ(F)(t)-Δ(F)(0)|(2)〉=C(F)(〈ɛ〉(0)(F)Δ(0)(F))(2/3)t(2).
  • The proportionality constant, C(F), was observed to be non-universal.
  • C(F) was found to be dependent on the temperature value of the isosurface where the flame particles are located.

Conclusions:

  • Flame particles exhibit distinct dispersion characteristics compared to fluid particles, despite similarities in scaling.
  • The observed modified Batchelor's scaling highlights the unique dynamics of flamelet propagation in turbulent flows.
  • The temperature dependency of the proportionality constant suggests that local flame structure significantly influences particle dispersion.