Molecular Transport Effects in Turbulent Diffusion Flames at Moderate Reynolds Number.

Abstract

In flames molecular diffusivities are enhanced by the high temperatures and can be of the same order as turbulent diffusivities in flames of moderate Reynolds number. A perturbation analysis is used to quantify effects in a hydrogen/air diffusion flame which arise from differential molecular diffusivities. The analysis uses perturbations about the equal diffusivity, adiabatic, equilibrium theory commonly used and yields solutions for the average and higher moments for the departures in normalized element mass fractions and enthalpy. The results are compared with the laser-Raman measurements of Drake et al. in a relatively low Reynolds number flame. Generally the agreement is excellent. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1981
Accession Number
ADA103869

Entities

People

  • R. W. Bilger

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Equilibrium
  • Chemical Reactions
  • Computational Fluid Dynamics
  • Computer Programs
  • Diffusion
  • Diffusivity
  • Equations
  • Mathematics
  • Military Research
  • Mixing
  • Probability
  • Probability Density Functions
  • Reynolds Number
  • Turbulent Diffusion
  • Turbulent Mixing
  • United States

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.

Technology Areas

  • Directed Energy