Flame cooling by a curved burner wall

R.M.M. Mallens, L.P.H. Goey, de

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
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Abstract

A recent investigation of flash-back of flames on slit and cylindrical burners showed that there is a systematic difference of about 10% between flash-back gradients of flames on slit and cylindrical burners with a burner diameter/width of 3.8 mm. In addition, the critical gradients become almost equal for burners with a diameter/width larger than about 6 mm. In this paper the effect of the burner wall curvature on the behaviour of, for example, the temperature field and the stand-off distance is analysed. The analysis shows that the burner wall curvature has an effect on the quenching layer thickness near the burner wall for burners smaller than about 6 mm. When the decrease of the cylindrical stand-off distance with increasing burner size is used to calculate the critical flash-back gradient based on a linear velocity profile for the cylindrical burners, the critical gradients for cylindrical and slit burners become almost the same for burners larger than about 5 mm. The analysis shows that the differences between flames on cylindrical and slit burners near the flash-back limit are mainly caused by differences in conductive heat transfer towards the burner wall, induced by burner wall curvature.
Original languageEnglish
Pages (from-to)699-707
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume41
Issue number4-5
DOIs
Publication statusPublished - 1998

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