Radiation enhanced B-Number

Radiative heat transfer plays a crucial role in most fire hazard related combustion processes. The existing classic and modified mass transfer B-Numbers have deficiencies for some burning cases of fires because they do not involve external radiation and/or assume flame transparent to thermal radiati...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Combustion and flame 2013-08, Vol.160 (8), p.1510-1518
Hauptverfasser: Jiang, Fenghui, Qi, Haiying, de Ris, John L., Khan, Mohammed M.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page 1518
container_issue 8
container_start_page 1510
container_title Combustion and flame
container_volume 160
creator Jiang, Fenghui
Qi, Haiying
de Ris, John L.
Khan, Mohammed M.
description Radiative heat transfer plays a crucial role in most fire hazard related combustion processes. The existing classic and modified mass transfer B-Numbers have deficiencies for some burning cases of fires because they do not involve external radiation and/or assume flame transparent to thermal radiation. This study extended the concept of the mass transfer B-Number using the one-dimensional steady-state diffusion flame model. An analytical expression of the universal mass transfer B-Number BR was derived, which applies to semi-transparent flames with external radiation. Compared with the classic mass transfer B-Number, in the numerator denoting the net heat generated and held by the combustion system, BR has an additional term that represents radiative heat which is being held and transferred within the semi-transparent flame; as well as in the denominator denoting the convective heat needing for maintaining the combustion, the contribution from the radiative heat is deducted from the total heat required for vaporizing a unit mass of fuel at the fuel surface. BR increases as external radiation and/or ambient oxygen concentration raise. In order to examine its physical significance, new parameters were defined and illustrated, such as the mass transfer equivalent absorption coefficient, specific radiant heat feedback and radiation factor, that demonstrate interactions of heat and mass transfers and radiative absorption and emission within inhomogeneous flames. Effects of the external radiation and ambient oxygen concentration on these parameters were also evaluated. Increases in the radiation factor as the ambient oxygen concentration rises theoretically validated enhanced radiative heat transfer in rich oxygen combustion.
doi_str_mv 10.1016/j.combustflame.2013.02.025
format Article
fullrecord <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1513450084</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0010218013000850</els_id><sourcerecordid>1513450084</sourcerecordid><originalsourceid>FETCH-LOGICAL-c420t-7a844e8e95d66e06f013a331430a1ed9bbb493698435de421d1fd598deeb7e933</originalsourceid><addsrcrecordid>eNqNkE1LxDAQhoMouK7-Ai-LIHhpnXy1jTddP2FRED2HNJlilnarSSv4782yi3hTGJjLM-87PIScUMgp0OJ8mdu-q8c4NK3pMGdAeQ4sjdwhEyplkTHF6C6ZAFDIGK1gnxzEuASAUnA-IcfPxnkz-H41w9WbWVl0s6vscexqDIdkrzFtxKPtnpLX25uX-X22eLp7mF8uMisYDFlpKiGwQiVdUSAUTXrCcE4FB0PRqbquheKFqgSXDgWjjjZOqsoh1iUqzqfkbJP7HvqPEeOgOx8ttq1ZYT9GTSXlQgKkgD9RwZSiQhZlQi82qA19jAEb_R58Z8KXpqDX8vRS_5an1_I0sDQyHZ9ue0y0pm1CMuPjTwIrhSwVVIm73nCY_Hx6DDpaj2uLPqAdtOv9f-q-Aft8iTE</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1429914567</pqid></control><display><type>article</type><title>Radiation enhanced B-Number</title><source>Access via ScienceDirect (Elsevier)</source><creator>Jiang, Fenghui ; Qi, Haiying ; de Ris, John L. ; Khan, Mohammed M.</creator><creatorcontrib>Jiang, Fenghui ; Qi, Haiying ; de Ris, John L. ; Khan, Mohammed M.</creatorcontrib><description>Radiative heat transfer plays a crucial role in most fire hazard related combustion processes. The existing classic and modified mass transfer B-Numbers have deficiencies for some burning cases of fires because they do not involve external radiation and/or assume flame transparent to thermal radiation. This study extended the concept of the mass transfer B-Number using the one-dimensional steady-state diffusion flame model. An analytical expression of the universal mass transfer B-Number BR was derived, which applies to semi-transparent flames with external radiation. Compared with the classic mass transfer B-Number, in the numerator denoting the net heat generated and held by the combustion system, BR has an additional term that represents radiative heat which is being held and transferred within the semi-transparent flame; as well as in the denominator denoting the convective heat needing for maintaining the combustion, the contribution from the radiative heat is deducted from the total heat required for vaporizing a unit mass of fuel at the fuel surface. BR increases as external radiation and/or ambient oxygen concentration raise. In order to examine its physical significance, new parameters were defined and illustrated, such as the mass transfer equivalent absorption coefficient, specific radiant heat feedback and radiation factor, that demonstrate interactions of heat and mass transfers and radiative absorption and emission within inhomogeneous flames. Effects of the external radiation and ambient oxygen concentration on these parameters were also evaluated. Increases in the radiation factor as the ambient oxygen concentration rises theoretically validated enhanced radiative heat transfer in rich oxygen combustion.</description><identifier>ISSN: 0010-2180</identifier><identifier>EISSN: 1556-2921</identifier><identifier>DOI: 10.1016/j.combustflame.2013.02.025</identifier><identifier>CODEN: CBFMAO</identifier><language>eng</language><publisher>Amsterdam: Elsevier Inc</publisher><subject>Applied sciences ; Classic mass transfer B-Number ; Combustion ; Combustion. Flame ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Exact solutions ; Feedback ; Fires ; Fuels ; Heat transfer ; Mass transfer ; Mass transfer equivalent absorption coefficient ; Mathematical models ; Miscellaneous ; Radiation factor ; Radiative heat transfer ; Semi-transparent flame ; Specific radiant heat feedback ; Theoretical studies. Data and constants. Metering ; Universal mass transfer B-Number BR</subject><ispartof>Combustion and flame, 2013-08, Vol.160 (8), p.1510-1518</ispartof><rights>2013 The Combustion Institute.</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c420t-7a844e8e95d66e06f013a331430a1ed9bbb493698435de421d1fd598deeb7e933</citedby><cites>FETCH-LOGICAL-c420t-7a844e8e95d66e06f013a331430a1ed9bbb493698435de421d1fd598deeb7e933</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.combustflame.2013.02.025$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=27457908$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Jiang, Fenghui</creatorcontrib><creatorcontrib>Qi, Haiying</creatorcontrib><creatorcontrib>de Ris, John L.</creatorcontrib><creatorcontrib>Khan, Mohammed M.</creatorcontrib><title>Radiation enhanced B-Number</title><title>Combustion and flame</title><description>Radiative heat transfer plays a crucial role in most fire hazard related combustion processes. The existing classic and modified mass transfer B-Numbers have deficiencies for some burning cases of fires because they do not involve external radiation and/or assume flame transparent to thermal radiation. This study extended the concept of the mass transfer B-Number using the one-dimensional steady-state diffusion flame model. An analytical expression of the universal mass transfer B-Number BR was derived, which applies to semi-transparent flames with external radiation. Compared with the classic mass transfer B-Number, in the numerator denoting the net heat generated and held by the combustion system, BR has an additional term that represents radiative heat which is being held and transferred within the semi-transparent flame; as well as in the denominator denoting the convective heat needing for maintaining the combustion, the contribution from the radiative heat is deducted from the total heat required for vaporizing a unit mass of fuel at the fuel surface. BR increases as external radiation and/or ambient oxygen concentration raise. In order to examine its physical significance, new parameters were defined and illustrated, such as the mass transfer equivalent absorption coefficient, specific radiant heat feedback and radiation factor, that demonstrate interactions of heat and mass transfers and radiative absorption and emission within inhomogeneous flames. Effects of the external radiation and ambient oxygen concentration on these parameters were also evaluated. Increases in the radiation factor as the ambient oxygen concentration rises theoretically validated enhanced radiative heat transfer in rich oxygen combustion.</description><subject>Applied sciences</subject><subject>Classic mass transfer B-Number</subject><subject>Combustion</subject><subject>Combustion. Flame</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Exact solutions</subject><subject>Feedback</subject><subject>Fires</subject><subject>Fuels</subject><subject>Heat transfer</subject><subject>Mass transfer</subject><subject>Mass transfer equivalent absorption coefficient</subject><subject>Mathematical models</subject><subject>Miscellaneous</subject><subject>Radiation factor</subject><subject>Radiative heat transfer</subject><subject>Semi-transparent flame</subject><subject>Specific radiant heat feedback</subject><subject>Theoretical studies. Data and constants. Metering</subject><subject>Universal mass transfer B-Number BR</subject><issn>0010-2180</issn><issn>1556-2921</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkE1LxDAQhoMouK7-Ai-LIHhpnXy1jTddP2FRED2HNJlilnarSSv4782yi3hTGJjLM-87PIScUMgp0OJ8mdu-q8c4NK3pMGdAeQ4sjdwhEyplkTHF6C6ZAFDIGK1gnxzEuASAUnA-IcfPxnkz-H41w9WbWVl0s6vscexqDIdkrzFtxKPtnpLX25uX-X22eLp7mF8uMisYDFlpKiGwQiVdUSAUTXrCcE4FB0PRqbquheKFqgSXDgWjjjZOqsoh1iUqzqfkbJP7HvqPEeOgOx8ttq1ZYT9GTSXlQgKkgD9RwZSiQhZlQi82qA19jAEb_R58Z8KXpqDX8vRS_5an1_I0sDQyHZ9ue0y0pm1CMuPjTwIrhSwVVIm73nCY_Hx6DDpaj2uLPqAdtOv9f-q-Aft8iTE</recordid><startdate>20130801</startdate><enddate>20130801</enddate><creator>Jiang, Fenghui</creator><creator>Qi, Haiying</creator><creator>de Ris, John L.</creator><creator>Khan, Mohammed M.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SU</scope><scope>7TB</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20130801</creationdate><title>Radiation enhanced B-Number</title><author>Jiang, Fenghui ; Qi, Haiying ; de Ris, John L. ; Khan, Mohammed M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c420t-7a844e8e95d66e06f013a331430a1ed9bbb493698435de421d1fd598deeb7e933</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Applied sciences</topic><topic>Classic mass transfer B-Number</topic><topic>Combustion</topic><topic>Combustion. Flame</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>Exact solutions</topic><topic>Feedback</topic><topic>Fires</topic><topic>Fuels</topic><topic>Heat transfer</topic><topic>Mass transfer</topic><topic>Mass transfer equivalent absorption coefficient</topic><topic>Mathematical models</topic><topic>Miscellaneous</topic><topic>Radiation factor</topic><topic>Radiative heat transfer</topic><topic>Semi-transparent flame</topic><topic>Specific radiant heat feedback</topic><topic>Theoretical studies. Data and constants. Metering</topic><topic>Universal mass transfer B-Number BR</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jiang, Fenghui</creatorcontrib><creatorcontrib>Qi, Haiying</creatorcontrib><creatorcontrib>de Ris, John L.</creatorcontrib><creatorcontrib>Khan, Mohammed M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environmental Engineering Abstracts</collection><collection>Mechanical &amp; Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Combustion and flame</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Jiang, Fenghui</au><au>Qi, Haiying</au><au>de Ris, John L.</au><au>Khan, Mohammed M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Radiation enhanced B-Number</atitle><jtitle>Combustion and flame</jtitle><date>2013-08-01</date><risdate>2013</risdate><volume>160</volume><issue>8</issue><spage>1510</spage><epage>1518</epage><pages>1510-1518</pages><issn>0010-2180</issn><eissn>1556-2921</eissn><coden>CBFMAO</coden><abstract>Radiative heat transfer plays a crucial role in most fire hazard related combustion processes. The existing classic and modified mass transfer B-Numbers have deficiencies for some burning cases of fires because they do not involve external radiation and/or assume flame transparent to thermal radiation. This study extended the concept of the mass transfer B-Number using the one-dimensional steady-state diffusion flame model. An analytical expression of the universal mass transfer B-Number BR was derived, which applies to semi-transparent flames with external radiation. Compared with the classic mass transfer B-Number, in the numerator denoting the net heat generated and held by the combustion system, BR has an additional term that represents radiative heat which is being held and transferred within the semi-transparent flame; as well as in the denominator denoting the convective heat needing for maintaining the combustion, the contribution from the radiative heat is deducted from the total heat required for vaporizing a unit mass of fuel at the fuel surface. BR increases as external radiation and/or ambient oxygen concentration raise. In order to examine its physical significance, new parameters were defined and illustrated, such as the mass transfer equivalent absorption coefficient, specific radiant heat feedback and radiation factor, that demonstrate interactions of heat and mass transfers and radiative absorption and emission within inhomogeneous flames. Effects of the external radiation and ambient oxygen concentration on these parameters were also evaluated. Increases in the radiation factor as the ambient oxygen concentration rises theoretically validated enhanced radiative heat transfer in rich oxygen combustion.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><doi>10.1016/j.combustflame.2013.02.025</doi><tpages>9</tpages></addata></record>
fulltext fulltext
identifier ISSN: 0010-2180
ispartof Combustion and flame, 2013-08, Vol.160 (8), p.1510-1518
issn 0010-2180
1556-2921
language eng
recordid cdi_proquest_miscellaneous_1513450084
source Access via ScienceDirect (Elsevier)
subjects Applied sciences
Classic mass transfer B-Number
Combustion
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Exact solutions
Feedback
Fires
Fuels
Heat transfer
Mass transfer
Mass transfer equivalent absorption coefficient
Mathematical models
Miscellaneous
Radiation factor
Radiative heat transfer
Semi-transparent flame
Specific radiant heat feedback
Theoretical studies. Data and constants. Metering
Universal mass transfer B-Number BR
title Radiation enhanced B-Number
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-25T20%3A53%3A17IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Radiation%20enhanced%20B-Number&rft.jtitle=Combustion%20and%20flame&rft.au=Jiang,%20Fenghui&rft.date=2013-08-01&rft.volume=160&rft.issue=8&rft.spage=1510&rft.epage=1518&rft.pages=1510-1518&rft.issn=0010-2180&rft.eissn=1556-2921&rft.coden=CBFMAO&rft_id=info:doi/10.1016/j.combustflame.2013.02.025&rft_dat=%3Cproquest_cross%3E1513450084%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1429914567&rft_id=info:pmid/&rft_els_id=S0010218013000850&rfr_iscdi=true