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Entrainment and Heat Flux of Buoyant Diffusion Flames. Final Report.


pdf icon Entrainment and Heat Flux of Buoyant Diffusion Flames. Final Report. (602 K)
McCaffrey, B. J.; Cox, G.

NBSIR 82-2473; 35 p. February 1982.

Available from:

National Technical Information Service
Order number: PB82-196296

Keywords:

buoyancy; cross correlation; diffusion flames; entrainment; heat flux; radiation; turbulence; cross correlation

Abstract:

Measurments of the vertical component of velocity in buoyant diffusion flames from extended sources by both cross-correlation and pressure proble techniques incorporating time-average signal processing appear to overestimate the transverse size of these systems based on a heat balance using measured mean flux. By utilizing measurements of the radiative fraction of the flames, and forcing a mean flux heat balance, estimates of the transverse variation of velocity are obtained and expressions for flame entrainment and convective heat flux are determined. The use of mean values is seen to lead to both overestimates as well as underestimates of total flux due to turbulent transport.