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Guillaume Legros

Bio: Guillaume Legros is an academic researcher from University of Paris. The author has contributed to research in topics: Soot & Diffusion flame. The author has an hindex of 21, co-authored 76 publications receiving 1553 citations. Previous affiliations of Guillaume Legros include Centre national de la recherche scientifique & École Normale Supérieure.


Papers
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Journal ArticleDOI
TL;DR: In this article, a series of microgravity, low oxidizer flow velocity, experiments where soot volume fraction measurements have been conducted on a laminar, flat plate boundary layer type diffusion flame.
Abstract: Local soot concentrations in non-buoyant laminar diffusion flames have been demonstrated to be the outcome of two competitive processes, soot formation and soot oxidation. It was first believed that soot formation was the controlling mechanism and thus soot volume fractions could be scaled with a global residence time. Later studies showed that this is not necessarily the case and the local ratio of the soot formation and oxidation residence times is the prime variable controlling the ultimate local soot volume fractions. This ratio is a strong function of geometry and flow field, thus a very difficult variable to properly quantify. This study presents a series of microgravity, low oxidizer flow velocity, experiments where soot volume fraction measurements have been conducted on a laminar, flat plate boundary layer type diffusion flame. The objective of the study is to determine if the above observations apply to this type of diffusion flames. The fuel is ethylene and is injected through a flat plate poro...

286 citations

Journal ArticleDOI
TL;DR: In this article, a realistic mass transfer number that takes into account complex modes of heat transfer is determined from the local standoff distance of a boundary layer flame by means of video recordings, which can be used as an effective material flammability criterion as well as a means to determine the relative importance of different heat transfer modes during upward flame spread.
Abstract: A realistic mass transfer number that takes into account complex modes of heat transfer is determined from the local standoff distance of a boundary layer flame. The standoff distance at each stage of the propagation and as afunction of the streamwise coordinate is obtained by means of video recordings. A previously developed theoretical model is used to calculate the standoff distance as a function of the mass transfer number ("B-number"). Comparison of the predictions with the experimental values allows extraction of the evolution of a realistic mass transfer number as a function of the streamwise coordinate. Such an evaluation can be used as an effective material flammability criterion as well as a means to determine the relative importance of different heat transfer modes during upward flame spread. Validation of this methodology is done by means of microgravity experiments that use PMMA as fuel, and a critical value of this realistic mass transfer number is consequently established as a criterion for...

89 citations

Journal ArticleDOI
TL;DR: In this article, a joint theoretical and experimental approach to implement the modulated absorption/emission technique is presented, where two-dimensional fields of soot temperature and volume fraction can then be measured simultaneously in a reference steady laminar coflow axis-symmetric non-premixed ethylene flame established over the Santoro burner.

65 citations

Journal ArticleDOI
TL;DR: In this paper, a large-scale flame spread experiment was conducted inside an orbiting spacecraft to study the effects of microgravity and scale and to address the uncertainty regarding how flames spread when there is no gravity and if the sample size and the experimental duration are, respectively, large enough and long enough to allow for unrestricted growth.

59 citations


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Book
26 Apr 2002
TL;DR: In this paper, the authors assembled a world-class group of contributors who address the questions the combustion diagnostic community faces, including chemists who identify the species to be measured and the interfering substances that may be present; physicists who push the limits of laser spectroscopy and laser devices and who conceive suitable measuremen.
Abstract: The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measuremen

492 citations

01 Jan 2016
TL;DR: The sfpe handbook of fire protection engineering is universally compatible with any devices to read and is available in the authors' digital library an online access to it is set as public so you can download it instantly.
Abstract: Thank you very much for downloading sfpe handbook of fire protection engineering. Maybe you have knowledge that, people have look numerous times for their favorite books like this sfpe handbook of fire protection engineering, but end up in infectious downloads. Rather than enjoying a good book with a cup of coffee in the afternoon, instead they juggled with some malicious bugs inside their laptop. sfpe handbook of fire protection engineering is available in our digital library an online access to it is set as public so you can download it instantly. Our digital library saves in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the sfpe handbook of fire protection engineering is universally compatible with any devices to read.

334 citations

Journal ArticleDOI
TL;DR: In this article, a series of microgravity, low oxidizer flow velocity, experiments where soot volume fraction measurements have been conducted on a laminar, flat plate boundary layer type diffusion flame.
Abstract: Local soot concentrations in non-buoyant laminar diffusion flames have been demonstrated to be the outcome of two competitive processes, soot formation and soot oxidation. It was first believed that soot formation was the controlling mechanism and thus soot volume fractions could be scaled with a global residence time. Later studies showed that this is not necessarily the case and the local ratio of the soot formation and oxidation residence times is the prime variable controlling the ultimate local soot volume fractions. This ratio is a strong function of geometry and flow field, thus a very difficult variable to properly quantify. This study presents a series of microgravity, low oxidizer flow velocity, experiments where soot volume fraction measurements have been conducted on a laminar, flat plate boundary layer type diffusion flame. The objective of the study is to determine if the above observations apply to this type of diffusion flames. The fuel is ethylene and is injected through a flat plate poro...

286 citations

Journal ArticleDOI
TL;DR: A comprehensive review of the researches on various aspects of soot formation utilizing counterflow flames is provided in this paper, with focus on the most recent (post-2010) research progress.

276 citations