Wall heat transfer in gas-fired furnaces: Effect of radiation modelling

dc.contributor.advisor
dc.contributor.authorVondál, Jiří
dc.contributor.authorHájek, Jiří
dc.date.accessioned2015-09-02T07:42:01Z
dc.date.available2015-09-02T07:42:01Z
dc.date.issued2015
dc.description.abstractThe purpose of this work is to study heat transfer to cooled walls in a MW-scale laboratory furnace with a dominating thermal radiation component. Experiment is performed in a specially designed combustion chamber with segmental water-cooled walls and profile of absor bed heat flux is measured along the flame. Non-premixed natural gas flame is stabilized by a guide-vane swirler. The unsteady governing equations of turbulent flow are solved by a finite-volume code with a two-equation k - ε realizable turbulence model, a combination of first-order and second-order upwind schemes and implicit time integration. The coupling of pressure with velocity is treated by SIMPLE (semi-implicit method for pressure-linked equations) algorithm. Radiative heat transfer as the main heat transfer method is modelled with special care by discr ete ordinates method and gas absorption coefficient is calculated by two alternatives of WSGGM (weighted sum of g rey gases model). The predicted total heat transfer rate is found to depend strongly on method chosen for the computation of mean beam length. The results of numerical simulations show that overall heat transfer in a process furnace can be su ccessfully predicted, while heat flux profile along the flame is more difficult to predi ct accurately. Good engineering accuracy is nevertheless achievable with reasonable computational resources. The trend of deviations is reported, which is useful for the interpretation of practi cal predictions of process furnaces (fired heaters).en
dc.format12 s.cs
dc.format.mimetypeapplication/pdf
dc.identifier.citationApplied and Computational Mechanics. 2015, vol. 9, no. 1, p. 67-78en
dc.identifier.issn1802-680X (Print)
dc.identifier.issn2336-1182 (Online)
dc.identifier.urihttp://www.kme.zcu.cz/acm/acm/article/view/276/322
dc.identifier.urihttp://hdl.handle.net/11025/15518
dc.language.isoenen
dc.publisherUniversity of West Bohemiaen
dc.relation.ispartofseriesApplied and Computational Mechanicsen
dc.rights© 2015 University of West Bohemia. All rights reserved.en
dc.rights.accessopenAccessen
dc.subjectmatematické modelovánícs
dc.subjectpřenos teplacs
dc.subjectmechanika plynůcs
dc.subject.translatedgas combustionen
dc.subject.translatedradiative heat transferen
dc.subject.translatednumerical modellingen
dc.titleWall heat transfer in gas-fired furnaces: Effect of radiation modellingen
dc.typečlánekcs
dc.typearticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen

Files

Original bundle
Showing 1 - 1 out of 1 results
No Thumbnail Available
Name:
Vondal.pdf
Size:
1.81 MB
Format:
Adobe Portable Document Format
Description:
Plný text
License bundle
Showing 1 - 1 out of 1 results
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: