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



B J. Mccaffrey, G Cox


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.
NIST Interagency/Internal Report (NISTIR) -


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


McCaffrey, B. and Cox, G. (1982), Entrainment and Heat Flux of Buoyant Diffusion Flames. Final Report., NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 21, 2024)


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Created February 1, 1982, Updated February 19, 2017