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Author : Yudaya Raju Sivathanu
Publisher :
ISBN 13 :
Total Pages : 213 pages
Book Rating : 4.:/5 (92 download)
Download or read book Soot and Radiation Properties of Boyant Turbulent Diffusion Flames written by Yudaya Raju Sivathanu and published by . This book was released on 1990 with total page 213 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 : 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 : 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 :
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.
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 : 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 : Y. R. Sivathanu
Publisher :
ISBN 13 :
Total Pages : 89 pages
Book Rating : 4.:/5 (212 download)
Download or read book Structure and Radiation Properties of Turbulent Diffusion Flames written by Y. R. Sivathanu and published by . This book was released on 1990 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Generalized state-relationship correlations, giving the mass fractions of major gas species as functions of local fuel-equivalence ratios, were developed for hydrocarbon/air diffusion flames. Instantaneous soot volume fractions and temperatures were measured in the fuel-rich (underfire) region of turbulent nonpremixed acetylene, propylene, ethylene and propane flames burning in still air. The continuum radiation properties of the underfire region of luminous acetylene and propylene flames burning in still air were studied.
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 : 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:
![Download Mixing and Radiation Properties of Buoyant Turblent [sic] Diffusion Flames PDF Online Free](https://books.google.com/books/content/images/frontcover/R1110AEACAAJ?fife=w200-h370)
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 : 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 : Sivakumar Santhanakrishnan
Publisher :
ISBN 13 :
Total Pages : 372 pages
Book Rating : 4.3/5 (91 download)
Download or read book Optical Properties of Soot Emitted from Buoyant Turbulent Diffusion Flames written by Sivakumar Santhanakrishnan and published by . This book was released on 2000 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soot Production and Thermal Radiation from Turbulent Jet Diffusion Flames written by and published by . This book was released on 1910 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this study is to advance the present capability for modelling soot production and thermal radiation from turbulent jet diffusion flames. Turbulent methane / air jet diffusion flames at atmospheric and elevated pressure are studied experimentally to provide data for subsequent model development and validation. Methane is only lightly sooting at atmospheric pressure whereas at elevated pressure the soot yield increases greatly. This allows the creation of an optically thick, highly radiating flame within a laboratory scale rig. Essential flame properties needed for model validation are measured at 1 and 3 atm. These are mean mixture fraction, mean temperature, mean soot volume fraction, and mean and instantaneous spectrally resolved radiation intensity. These two flames are modelled using the parabolic CFD code GENMIX. The combustion / turbulence interaction is modelled using the conserved scalar / laminar flamelet approach. The chemistry of methane combustion is modelled using a detailed chemistry laminar flame code. The combustion model accommodates the non-adiabatic nature of the flames through the use of multiple flamelets for each scalar. The flamelets are differentiated by the amount of radiative heat loss that is included. Flamelet selection is carried out through the solution of a balance equation for enthalpy, which includes a source term for the radiative heat loss. A new soot model has been developed and calibrated by application to a laminar flame calculation. Within the turbulent flame calculations the soot production is fully coupled to the radiative loss. This is achieved through the use of multiple flamelets for the soot source terms and the inclusion of the radiative loss from the soot (as well as the gases) in the enthalpy source. Spectral radiative emission from the flames has been modelled using the RADCAL code. Mean flame properties from the GENMIX calculations are used as an input to RADCAL.
Author : S. S. Krishnan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (847 download)
Download or read book Optical Properties of Soot in the Overfire Region of Large Buoyant Turbulent Diffusion Flames written by S. S. Krishnan and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : U. O. Koylu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (847 download)
Download or read book Optical Properties of Overfire Soot in Buoyant Turbulent Diffusion Flames at Long Residence Times written by U. O. Koylu and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
