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On The Structure And Stability Of Diffusion Flames
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Book Synopsis The Structure and Stability of Diffusion Flames by : D. A. Scholefield
Download or read book The Structure and Stability of Diffusion Flames written by D. A. Scholefield and published by . This book was released on 1949 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure and Stability of Diffusion Flames by : John Barr
Download or read book The Structure and Stability of Diffusion Flames written by John Barr and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of the Structure and Stability of Diffusion Flames by : Derek Arthur Scholefield
Download or read book A Study of the Structure and Stability of Diffusion Flames written by Derek Arthur Scholefield and published by . This book was released on 1950 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Structure and Stability of Diffusion Flames by : Sally Ann Cheatham
Download or read book On the Structure and Stability of Diffusion Flames written by Sally Ann Cheatham and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion flames are flames in which fuel and oxidant, initially separate, come together to react chemically in a relatively thin combustion zone. Asymptotic methods, supplemented by numerical computation, are used to analyze the structure and dynamical properties of such flames. Attention is first focused on diffusion flames in arbitrary fluid flows for general fuel and oxidant Lewis numbers, in which the combustion is complete or nearly complete. Thus the limit of large Damkohler number and large activation energy is considered. The resulting mathematical formulation consists of a free boundary problem, with the flame as the free boundary. Such a treatment greatly simplifies the governing system of equations, and provides a framework for the analysis of the flame structure as well as its dynamical properties. The stability of a planar flame is next considered, with attention focused on diffusional-thermal effects. A dispersion relation is obtained, which relates the growth parameter and wavenumber of disturbances to the fuel and oxidant Lewis numbers, supply temperatures, and supply concentrations. Analysis of the dispersion relations indicates that instability corresponding to cellularity of the flame may occur for lean flames under near extinction conditions when the Lewis numbers of fuel and oxidant are sufficiently low. The asymptotic model is also used to identify conditions under which flame extinction occurs. In particular, the burning characteristics of a dilute spray diffusion flame have been examined. The presence of fuel droplets in the fuel supply is shown to alter the extinction characteristics of the flame. The onset of oscillations in the spherical diffusion flame surrounding a fuel droplet is also considered. Motivated by recent microgravity candle flame experiments, the constraint of a weak oxidant environment is imposed. A linear stability analysis indicates that oscillations may indeed result when radiative heat losses and the Lewis numbers of fuel and oxidant are sufficiently large. Estimates for the critical conditions are given, along with a prediction of the resulting frequency of oscillation. A weakly non-linear analysis is then used to more fully investigate the transition to an oscillatory burning state.
Book Synopsis Structure and Stability of Buoyant Diffusion Flames by : Graham Christopher Fleming
Download or read book Structure and Stability of Buoyant Diffusion Flames written by Graham Christopher Fleming and published by . This book was released on 1982 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure and Stability of Enclosed Laminar Jet Diffusion Flames by : Kezhong Jia
Download or read book The Structure and Stability of Enclosed Laminar Jet Diffusion Flames written by Kezhong Jia and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure and Stability of Bouyant Diffusion Flames by : Graham Christopher Fleming
Download or read book Structure and Stability of Bouyant Diffusion Flames written by Graham Christopher Fleming and published by . This book was released on 1982 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Flow Structure and Stability Limits of Jet Diffusion Flames in a Co-flowing Oxidizing Stream by : Nancy Papanikolaou
Download or read book An Experimental Investigation of the Flow Structure and Stability Limits of Jet Diffusion Flames in a Co-flowing Oxidizing Stream written by Nancy Papanikolaou and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure and Extinction of Diffusion Flames by : Anthony Hamins
Download or read book The Structure and Extinction of Diffusion Flames written by Anthony Hamins and published by . This book was released on 1985 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diffusion Flames in the Laboratory by : John Barr
Download or read book Diffusion Flames in the Laboratory written by John Barr and published by . This book was released on 1954 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Swirl on the Stability and Turbulent Structure of Jet Diffusion Flames by : F. Takahashi
Download or read book Effects of Swirl on the Stability and Turbulent Structure of Jet Diffusion Flames written by F. Takahashi and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogen and Methane Edge and Diffusion Flames in Opposed Jet Configurations by : Andrea Ciani
Download or read book Hydrogen and Methane Edge and Diffusion Flames in Opposed Jet Configurations written by Andrea Ciani and published by . This book was released on 2006 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Computational Study of the Structure, Stability, Dynamics, and Response of Low Stretch Diffusion Flame by : Jagannath Ramchandra Nanduri
Download or read book A Computational Study of the Structure, Stability, Dynamics, and Response of Low Stretch Diffusion Flame written by Jagannath Ramchandra Nanduri and published by . This book was released on 2006 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Flow Structure and Stability Limits of Jet Diffusion Flames in a Co-flowing Oxidizing Stream by :
Download or read book An Experimental Investigation of the Flow Structure and Stability Limits of Jet Diffusion Flames in a Co-flowing Oxidizing Stream written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Inert Gases and Flow Velocities on the Structure and Stability of Coflow Diffusion Flames by : Daniel Tomio Souza
Download or read book Effects of Inert Gases and Flow Velocities on the Structure and Stability of Coflow Diffusion Flames written by Daniel Tomio Souza and published by . This book was released on 2021 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: A deeper understanding of flame stabilization and extinguishing mechanisms is necessary in developing the next generation of flame suppressants. In order to understand the effects of inert gases on coflow diffusion flames, a 28-mm diameter cup burner was used to generate methane and propane coflow diffusion flames. The measured minimum extinguishing concentration of N2 added to the coflow air was 28.5 +/- 0.05 % and 34.0 +/- 0.07 % for methane and propane, respectively, and those for CO2 were 17.2 +/- 0.12 % and 22.4 +/- 0.06 %, respectively. Silica-coated, 50-um R-type thermocouples were used to measure temperature in the flames as N2 or CO2 was added to the coflow air. Thin filament pyrometry technique using a 15-um SiC fiber was also applied in an attempt to measure the temperature of the inert gas-added flames. For calibrations of the temperature measurements, a 25.4-mm x 25.4-mm Hencken burner was used to produce a near-adiabatic initially unmixed methane flame. In addition to the thermal flame structure measurements, the stability limits of laminar jet diffusion flames were measured for various fuels (methane, ethane, ethylene, acetylene propane, butane, and 1-butene) to further elaborate the effects of flow velocities on diffusion flame stabilization and extinguishing mechanisms. Through these experimental techniques, the temperature effects of inert gases on coflow diffusion flames were observed and factors leading to instability in laminar jet diffusion flames were identified.
Book Synopsis Studies on the structure of diffusion flames by : Suk Ho Chung
Download or read book Studies on the structure of diffusion flames written by Suk Ho Chung and published by . This book was released on 1983 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722457822 Total Pages :26 pages Book Rating :4.4/5 (578 download)
Book Synopsis On the Structure of Gaseous Confined Laminar Diffusion Flames by : National Aeronautics and Space Administration (NASA)
Download or read book On the Structure of Gaseous Confined Laminar Diffusion Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and characteristics of gaseous confined laminar diffusion flames are investigated by numerically solving the time-dependent two-dimensional axisymmetric conservation equations. The numerical model accounts for the important chemical and physical processes involved, including axial diffusion, viscous effects, radial convection, and finite-rate chemistry. The numerical results clearly show that the flame has a finite thickness and leakage of fuel vapor into the flame zone is possible. The effect of heat release is found to induce some radial flow. Predicted flame shape and dimensions are compared to the classical Burke-Schumann flame. The numerically calculated flame is observed to be about 15 percent taller and 5 percent narrower than that of the Burke-Schumann solution under the same conditions. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...