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Download or read book Mixing and Radiation Properties of Buoyant Turbulent Diffusion Flames. September 1, 1993-August 31, 1994 written by and published by . This book was released on 1955 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Building and Fire Research Laboratory (U.S.)
Publisher :
ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (52 download)
Download or read book Mixing and Radiation Properties of Buoyant Turbulent Diffusion Flames written by Building and Fire Research Laboratory (U.S.) and published by . This book was released on 1995 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Present measurements emphasized self-preserving conditions far from the source where effects of source momentum and other source disturbances have been lost. The results show that earlier measurements in the literature were not carried out at sufficient distances from the source to reach self-preserving conditions, and provide measured properties at self-preserving conditions needed to develop and evaluate higher-order models of buoyant turbulent flows. The measurements were used to evaluate a simple k-E-g turbulence model finding good agreement between measured and predicted mean velocities and mixture fractions based on standard turbulence model constants, which is not unusual for a simple classical flow like the self-preserving buoyant turbulent plume.
Author : Z. Dai
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (44 download)
Download or read book Radiation and Mixing Properties of Buoyant Turbulent Diffusion Flames written by Z. Dai and published by . This book was released on 1993 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two aspects of unwanted fires were considered: (1) the optical properties of soot in the fuel-lean region of buoyant turbulent diffusion flames, and (2) the structure and mixing properties of buoyant turbulent plumes. The scattering, absorption and extinction properties of soot were measured for conditions where soot structure was known from earlier transmission electron microscopy measurements. The measurements were compared with predictions based on the Rayleigh-Debye-Gans (RDG) scattering approximation for polydisperse fractal aggregates.
Author :
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (154 download)
Download or read book Mixing and Radiation Properties of Buoyant Luminous Flame Environments written by and published by . This book was released on 1996 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study investigates the radiation and mixing properties of buoyant turbulent diffusion flames, specifically the optical and radiative properties of soot and the structure and mixing properties of buoyant turbulent plumes.
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Author : Z. Dai
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (47 download)
Download or read book Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames written by Z. Dai and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames PDF Online Free](https://books.google.com/books/content/images/frontcover/EcQJtwAACAAJ?fife=w200-h370)
Author : Z. Dai
Publisher :
ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (47 download)
Download or read book Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames written by Z. Dai and published by . This book was released on 1995 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : YUDAYA RAJU SIVATHANU
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (687 download)
Download or read book SOOT AND RADIATION PROPERTIES OF BUOYANT TURBULENT DIFFUSION FLAMES (FLAMES). written by YUDAYA RAJU SIVATHANU and published by . This book was released on 1990 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: correlations in flames, suggesting a strong relationship between soot and turbulence properties in these flames required for the existence of soot volume fraction state relationships. Instantaneous measurements of soot volume fractions and mixture fractions are needed to evaluate this concept fully.
Author : San-Mou Jeng
Publisher :
ISBN 13 :
Total Pages : 237 pages
Book Rating : 4.:/5 (192 download)
Download or read book An Investigation of Structure and Radiation Properties of Turbulent Buoyant Diffusion Flames written by San-Mou Jeng and published by . This book was released on 1984 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S-M. Jeng
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (15 download)
Download or read book An Investigation of Axisymmetric Buoyant Turbulent Diffusion Flames written by S-M. Jeng and published by . This book was released on 1984 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Z. Dai
Publisher :
ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (52 download)
Download or read book Mixing and Radiation Properties of Buoyant Luminous Flame Environments written by Z. Dai and published by . This book was released on 1995 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition, dimensionaless extinction coefficients and the soot fractal dimensions were measured. The structure and mixing properties of buoyant turbulent plumes were investigated by examination of the effects of coflow on earlier measurements and by evaluating various modeling approximations, with an emphasis on self-preserving round buoyant turbulent plumes.
Author : S-M. Jeng
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (5 download)
Download or read book An Investigation of Axisymmetric Buoyant Turbulent Diffusion Flames written by S-M. Jeng and published by . This book was released on 1982 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation considered measurements of the structure of axisymmetric, buoyant, turbulent diffusion flames in still air. Profiles of mean temperature, mean velocity, velocity fluctuations and total radiant heat flux were completed for methane flames, including careful characterization of burner exit conditions, in order to provide data for the evaluation of models of the process. Preliminary tests also provided mean temperature profiles for propane flames. Test conditions were chosen so that the flow was turbulent near the burner exit while effects of buoyancy were significant over most of the luminous portion of the flames. Both the present measurements and those of other investigators were compared with predictions of a k-E-g differential model, which included effects of buoyancy in the transport equations for turbulence quantities. The results indicated anisotropic effects in regions where buoyancy dominates flow properties suggesting the eventual desirability of multi-stress models for buoyant flames, although extensive recalibration of model constants from a limited data based would be required if this step were taken. Additional measurements and analysis of methane flames are in progress, in order to investigate the flame radiation properties and provide additional data on turbulence properties needed for model development.
Author : MICHAEL EMMANUEL KOUNALAKIS
Publisher :
ISBN 13 :
Total Pages : 271 pages
Book Rating : 4.:/5 (212 download)
Download or read book STRUCTURE AND RADIATION PROPERTIES OF TURBULENT DIFFUSION FLAMES (FLAMES). written by MICHAEL EMMANUEL KOUNALAKIS and published by . This book was released on 1990 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: scales. (Abstract shortened with permission of author.)
Author : United States. National Bureau of Standards
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (187 download)
Download or read book Radiation from Turbulent Nonluminous and Luminous Diffusion Flames written by United States. National Bureau of Standards and published by . This book was released on 1987 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical and experimental study of the structure and radiation properties of turbulent buoyant diffusion flames is described. The results have application to modeling fires within structures, materials test methods, fire detection, and effects of materials on fire properties. The investigation consists of two phases, as follows: study of effects of turbulence/radiation interactions, considering the properties of nonluminous hydrogen/air diffusion flames; and study of extension of the laminar flamelet concept to soot properties needed to predict radiation from luminous acetylene/air and ethylene/air turbulent diffusion flames. Theory and experiment are considered in both phases of the investigation. Measurements in turbulent hydrogen/air diffusion flames yielded radiation fluctuation intensities of 20-110 percent, providing direct evidence of the importance of turbulence/radiation interactions. A stochastic analysis, based on the laminar flamelet concept, was developed which provided encouraging predictions of mean and fluctuating spectral radiation intensities (average discrepancies between predictions and measurements were roughly 30 percent), as well as temporal power spectral densities of radiation fluctuations. The temporal spectra exhibit energy-containing and inertial regions, very similar to other turbulence properties, although the rate of decay of the spectra with increasing frequency in the inertial region is somewhat greater than observed for scalar fluctuations. Measurements and predictions in the turbulent luminous flames concentrated on scalar properties (particularly soot volume fractions) in the overfire region. Predictions of scalar properties based on the laminar flamelet concept were very encouraging. Direct evaluation of soot volume fraction state relationships for the overfire region was hampered by effects of turbulent fluctuations and experimental uncertainties; nevertheless, within these limitations, soot volume fraction state relationships were nearly universal, and soot generation efficiencies nearly constant, for sufficiently long residence times. However, effects of finite-rate chemistry were noted for short residence time ethylene/air flames, causing spatial variations of soot generation efficiencies in the overfire region. For long residence times, present measurements of soot generation efficiencies were in reasonably good agreement with earlier findings for acetylene/air and ethylene/air diffusion flames.
Author :
Publisher :
ISBN 13 :
Total Pages : 57 pages
Book Rating : 4.:/5 (618 download)
Download or read book Mixing and Radiation Properties of Buoyant Luminous Flame Environments written by and published by . This book was released on 1997 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harold S. Pergament
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (227 download)
Download or read book Properties of Large Turbulent Hydrogen/Air Diffusion Flames written by Harold S. Pergament and published by . This book was released on 1977 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of IR radiation from large, turbulent H2/air diffusion flames requires a detailed analysis of flame properties, including the effects of buoyancy. This report gives the methodology employed for analyzing such flames and the results of calculations on large flames. These (and subsequent) results have been used as input to the IR radiation calculations on the C-1 stack discussed in Part 2 of this final report. The model discussed herein treats the axisymmetric turbulent mixing of coflowing streams, including nonequilibrium chemistry, employing an eddy viscosity formulation. Comparisons are made between model predictions and the nonbuoyant laboratory H2/air flame data. It is shown that centerline temperatures and species mole fractions can be predicted to good accuracy. However, the calculated rate of radial transport of energy and mass is greater than that measured in the laboratory experiments. The results of a series of parametric calculations on buoyant flames and comparisons with buoyant flame length data show that: flame properties scale with nondimensional distance for Froude numbers (Fr) greater than about 1,000,000, buoyancy significantly affects temperature decay rates downstream of the location of maximum temperature (after all the H2 has burned), and the predicted influence of Fr on buoyant flame lengths is consistent with the available data.
Author :
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.3/5 (91 download)
Download or read book NIST Building & Fire Research Laboratory Publications written by and published by . This book was released on 1992 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Institute of Standards and Technology (U.S.)
Publisher :
ISBN 13 :
Total Pages : 1162 pages
Book Rating : 4.3/5 (243 download)
Download or read book Publications of the National Institute of Standards and Technology ... Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1994 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
