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Author : Richard Alan Beier
Publisher :
ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (13 download)
Download or read book Soot and Radiation in Combusting Boundary Layers written by Richard Alan Beier and published by . This book was released on 1982 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soot and Radiation in Combusting Boundary Layers written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In most fires thermal radiation is the dominant mode of heat transfer. Carbon particles within the fire are responsible for most of this emitted radiation and hence warrant quantification. As a first step toward understanding thermal radiation in full scale fires, an experimental and theoretical study is presented for a laminar combusting boundary layer. Carbon particulate volume fraction profiles and approximate particle size distributions are experimentally determined in both free and forced flow for several hydrocarbon fuels and PMMA (polymethylmethacrylate). A multiwavelength laser transmission technique determines a most probable radius and a total particle concentration which are two unknown parameters in an assumed Gauss size distribution. A sooting region is observed on the fuel rich side of the main reaction zone. For free flow, all the flames are in air, but the free stream ambient oxygen mass fraction is a variable in forced flow. To study the effects of radiation heat transfer, a model is developed for a laminar combusting boundary layer over a pyrolyzing fuel surface. An optically thin approximation simplifies the calculation of the radiant energy flux at the fuel surface. For the free flames in air, the liquid fuel soot volume fractions, f/sub v/, range from f/sub v/ approx. 10−7 for n-heptane, a paraffin, to f/sub v/ approx. 10−7 for toluene, an aromatic. The PMMA soot volume fractions, f/sub v/ approx. 5 x 10−7, are approximately the same as the values previously reported for pool fires. Soot volume fraction increases monotonically with ambient oxygen mass fraction in the forced flow flames. For all fuels tested, a most probable radius between 20 nm and 80 nm is obtained which varies only slightly with oxygen mass fraction, streamwise position, or distance normal to the fuel surface. The theoretical analysis yields nine dimensionless parameters, which control the mass flux rate at the pyrolyzing fuel surface.
Author : Clement Ighama Okoh
Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (29 download)
Download or read book Soot and Radiation in Free Boundary Layer Flames written by Clement Ighama Okoh and published by . This book was released on 1984 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Maria G. Carvalho
Publisher : Springer Science & Business Media
ISBN 13 : 3642846378
Total Pages : 622 pages
Book Rating : 4.6/5 (428 download)
Download or read book Heat Transfer in Radiating and Combusting Systems written by Maria G. Carvalho and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the selected papers presented at the EUROTHERM SEMINAR No. 17 - Heat Transfer in Radiating and Combusting Systems held at Cascais from October 8th- 10th, 1990. The EUROTHERM COMMITTEE was created by representatives of the member countries of the European Communities for the organization and coordination of European Scientific events in the field of thermal sciences and their applications. The book is focused on the integration of the heat transfer and combustion. These two subjects have traditionally been considered separate disciplines. In reality, the two are closely interwoven. The central purpose of the book is to generate an effective cross fertilisation of the two at both the fundamental and applied levels. The book reports on: mathematical simulations of heat transfer in reacting systems, new measurements of and measurement techniques for the radiation properties of the intervening medium, and data and theoretical analyses which clarify the physical nature of the complex interactions between the radiation/convection heat transfer processes and the combustion and turbulence of real reacting flows.
Author : Naim Afgan
Publisher :
ISBN 13 :
Total Pages : 526 pages
Book Rating : 4.3/5 (91 download)
Download or read book Heat Transfer in Flames written by Naim Afgan and published by . This book was released on 1974 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Paper written by and published by . This book was released on 1989 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1176 pages
Book Rating : 4.U/5 (183 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael F. Modest
Publisher : Springer
ISBN 13 : 3319272918
Total Pages : 167 pages
Book Rating : 4.3/5 (192 download)
Download or read book Radiative Heat Transfer in Turbulent Combustion Systems written by Michael F. Modest and published by Springer. This book was released on 2016-01-06 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction reviews why combustion and radiation are important, as well as the technical challenges posed by radiation. Emphasis is on interactions among turbulence, chemistry and radiation (turbulence-chemistry-radiation interactions – TCRI) in Reynolds-averaged and large-eddy simulations. Subsequent chapters cover: chemically reacting turbulent flows; radiation properties, Reynolds transport equation (RTE) solution methods, and TCRI; radiation effects in laminar flames; TCRI in turbulent flames; and high-pressure combustion systems. This Brief presents integrated approach that includes radiation at the outset, rather than as an afterthought. It stands as the most recent developments in physical modeling, numerical algorithms, and applications collected in one monograph.
Author : James Alfred Ang
Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (29 download)
Download or read book Perturbed Boundary Layer Diffusion Flames written by James Alfred Ang and published by . This book was released on 1986 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 956 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jorge Omar Contreras Rodriguez
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (993 download)
Download or read book Numerical Study of Soot Formation written by Jorge Omar Contreras Rodriguez and published by . This book was released on 2015 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microgravity ethylene laminar boundary layer diffusion flames generated by a flat porous burner and characterized by the fuel injection velocities of 3 and 4 mm/s and an oxidizer velocity of 250 mm/s have been simulated by using an accurate radiation model, a comprehensive kinetic mechanism, and a soot model consisting of inception as a result of the collision of two pyrene molecules, heterogeneous surface growth and oxidation following the hydrogen abstraction acetylene addition (HACA) mechanism, soot particle coagulation, and PAH surface condensation. Model predictions are in reasonable agreement with the experimental data in terms of the stand-off distance and soot volume fraction. The stand-off distance and soot production are enhanced as the fuel velocity increases. H and OH radicals, responsible of the de-hydrogenation of sites in the HACA process, and pyrene, of the species for soot inception and PAH condensation processes, are found to be located in a region that follows the stand-off distance. Soot is then produced in this region and is transported inside the boundary layer by convection and thermophoresis. Radiative loss is substantially higher in these flames than in normal gravity diffusion flames owing to much longer residence times. Calculations carried out by neglecting soot radiation and by using the optically-thin approximation (OTA) revealed that soot dominates the radiative heat transfer in these flames and that the use of OTA gives rise to significant discrepancies in temperature and soot volume fraction.
Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.:/5 (31 download)
Download or read book Fossil Energy Update written by and published by . This book was released on 1978 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohammad Faghri
Publisher : WIT Press
ISBN 13 : 1845641604
Total Pages : 497 pages
Book Rating : 4.8/5 (456 download)
Download or read book Transport Phenomena in Fires written by Mohammad Faghri and published by WIT Press. This book was released on 2008 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlled fires are beneficial for the generation of heat and power while uncontrolled fires, like fire incidents and wildfires, are detrimental and can cause enormous material damage and human suffering. This edited book presents the state-of-the-art of modeling and numerical simulation of the important transport phenomena in fires. It describes how computational procedures can be used in analysis and design of fire protection and fire safety. Computational fluid dynamics, turbulence modeling, combustion, soot formation, thermal radiation modeling are demonstrated and applied to pool fires, flame spread, wildfires, fires in buildings and other examples.
Download or read book Soot Profiles in Boundary-layer Flames written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon particulate volume fractions and approximate particle size distributions are measured in a free laminar combusting boundary layer for liquid hydrocarbon fuels (n-heptane, iso-octane, cyclohexane, cyclohexene, toluene) and polymethylmethacrylate (PMMA). A multiwavelength laser transmission technique determines a most probable radius and the total particle concentration, which are two parameters in an assumed form for the size distribution. In the combusting boundary layer, a sooting region exists between the pyrolyzing fuel surface and the flame zone. The liquid fuel soot volume fractions, f/sub v/, range from f/sub v/ approx. 10−7 for n-heptane, a paraffin, to f/sub v approx. 10−5 for toluene, an aromatic. The PMMA volume fractions, f/sub v/ approx. 5 X 10−7, are approximately the same as the values previously reported for pool fires. The soot volume fractions increase with height; convection of carbon particles downstream widens the soot region with height. For all fuels tested, the most probable radius is between 20 nm and 50 nm, and it changes only slightly with height and distance from the fuel surface.
Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Takashi Tamaru
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (89 download)
Download or read book Radiative Heat Transfer in a Diffusion Flame written by Takashi Tamaru and published by . This book was released on 1973 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kwi Young Lee
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (29 download)
Download or read book Thermal Radiation Effects on Combustion of Condensed Fuels written by Kwi Young Lee and published by . This book was released on 1984 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
