Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14193
Title: Heat transfer characteristics of an array of impinging pre-mixed slot flame jets
Authors: Kwok, LC
Leung, CW 
Cheung, CS 
Keywords: Impingement heat transfer
Multiple slot flame jets
Pre-mixed butane/air combustion
Issue Date: 2005
Publisher: Pergamon Press
Source: International journal of heat and mass transfer, 2005, v. 48, no. 9, p. 1727-1738 How to cite?
Journal: International journal of heat and mass transfer 
Abstract: An experimental study was carried out to investigate the shape and the heat transfer characteristics of an array of three laminar pre-mixed butane/air slot flame jets impinging upwards normally on a horizontal water-cooled flat plate. The effects of jet-to-jet spacing and nozzle-to-plate distance were examined at the Reynolds number (Re) of 1000 and the equivalence ratio (ϕ) of unity. Comparisons of the heat transfer characteristics between single and multiple slot flame jets, as well as multiple slot and round jets, were made. The between-jet interference decreased with increasing jet-to-jet spacing (s/de) and nozzle-to-plate distance (H/de). Strong interference was obtained at s/de = 1 and H/de = 2, at which the central jet was suppressed while the side jets were deflected towards their free sides. In addition, there was no minimum heat flux found in the inter-jet interacting zone, instead, a peak heat flux was obtained. Thermal performance was reduced when H/de became smaller than the length of the conical luminous reaction zone of the flame. A maximum average heat flux occurred at the moderate jet-to-jet spacing of s/de = 2.5 at Re = 1000, ϕ = 1 and H/de = 2. The resultant heat flux distribution of the central jet of a multiple slot jets system was higher than that of a single slot jet when the jet-to-jet spacing was small, but this advantage in thermal performance diminished when the jet-to-jet spacing was increased. Besides, the area-averaged heat flux of the multiple slot flame jets was higher than that of the multiple round flame jets arranged at the same geometric configuration.
URI: http://hdl.handle.net/10397/14193
ISSN: 0017-9310
EISSN: 1879-2189
DOI: 10.1016/j.ijheatmasstransfer.2004.11.014
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

28
Last Week
5
Last month
Citations as of Feb 26, 2017

WEB OF SCIENCETM
Citations

26
Last Week
0
Last month
1
Citations as of Aug 10, 2017

Page view(s)

31
Last Week
4
Last month
Checked on Aug 14, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.