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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20059

Title: Investigation of the soot formation in ethylene laminar diffusion flames when diluted with helium or supplemented by hydrogen
Authors: Zhao, Huayong
Stone, Richard
Williams, Ben
Issue Date: 2014
Publisher: © American Chemical Society
Citation: ZHAO, H., STONE, R. and WILLIAMS, B., 2014. Investigation of the soot formation in ethylene laminar diffusion flames when diluted with helium or supplemented by hydrogen. Energy and Fuels, 28(3), pp. 2144-2151.
Abstract: A new optical diagnostic technique has been used to measure the spatially distributed temperatures, soot diameters, and soot volume fractions in several different ethylene laminar diffusion flames to investigate the effect of adding hydrogen and helium on the soot formation. The test results show that adding hydrogen increases the flame temperature in all regions, while adding helium does not significantly affect the flame temperature in the reaction region but does increase the flame temperature elsewhere. The flame heights when adding helium and hydrogen can be calculated using the correlation introduced by Roper if the ethylene diffusion coefficient is used. This indicates that the flame height is determined by the diffusion of ethylene molecules when the hydrogen fraction is below 20%. It was also found that either adding helium or hydrogen does not significantly affect the soot diameter but does reduce the soot volume fraction. A total of 20% of helium addition by volume was measured to reduce the total soot number by 19%, while a total of 20% of hydrogen addition reduced the total soot number by 23%. In comparison, replacing the hydrocarbon with hydrogen is much more effective in reducing soot formation. Replacement of 25% ethylene by hydrogen was measured to reduce the total soot number by 66%. Apart from demonstrating the influence of hydrogen and helium on ethylene diffusion flames, these measurements provide additional data for modelers of diffusion flames, especially those with an interest in the formation of particulate matter. © 2014 American Chemical Society.
Description: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy and Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/ef401970q
Version: Accepted for publication
DOI: 10.1021/ef401970q
URI: https://dspace.lboro.ac.uk/2134/20059
Publisher Link: http://dx.doi.org/10.1021/ef401970q
ISSN: 0887-0624
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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