Accession Number : ADA103869


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


Descriptive Note : Technical summary rept.,


Corporate Author : WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER


Personal Author(s) : Bilger,R W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a103869.pdf


Report Date : Jul 1981


Pagination or Media Count : 38


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)


Descriptors :   *MATHEMATICAL MODELS , *TURBULENCE , *COMBUSTION , *TRANSPORT PROPERTIES , *DIFFUSION , *FLAMES , *MOLECULAR PROPERTIES , KINEMATICS , SHEAR PROPERTIES , HIGH TEMPERATURE , ANALYSIS OF VARIANCE , DIFFERENTIAL EQUATIONS , PERTURBATIONS , COVARIANCE , ENTHALPY , REYNOLDS NUMBER , DERIVATIVES(MATHEMATICS)


Subject Categories : Statistics and Probability
      Fluid Mechanics
      Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE