Flame jet impingement heat transfer from an array of radial jet reattachment flames
The use of gas-fired rapid heating techniques for metal and glass products has many advantages over typical furnace heating techniques, namely: high thermal efficiency, improved product quality, faster heating response time, and increased productivity. Recent reviews have focused on understanding the heat transfer aspects of impinging flame jets. In their two reviews, Baukal and Gebhart discuss the experimental conditions as well as the measurements made with impinging flame jet systems. Their findings add more detailed information to the earlier work of Viskanta (1993) but these reviews clearly demonstrate the scarcity of data regarding impinging flame jets. Here, flame jet impingement heat transfer for an array of Radial Jet Reattachment Combustion (RJRC) nozzles has been studied for flames which were highly, moderately, and weakly interactive. The low, however, the most uniform between-nozzle heat flux distribution on the impingement surface occurred at the closest between-nozzle spacing, when the flames were highly interacting. The highest between-nozzle heat flux was measured when the flame jets were moderately interacting at intermediate between-nozzle spacing. At large spacings, the RJRC nozzles became weakly interacting and behaved much like independent RJRC nozzles with relatively low heat flux to the impingement surface. Based on the heat flux profiles, the optimal between-nozzle spacing was identified and flame temperatures as well as additional heat flux profiles in the direction perpendicular to the line connecting the RJRC nozzles were measured.
- Research Organization:
- Texas A and M Univ., College Station, TX (US)
- OSTI ID:
- 20013367
- Country of Publication:
- United States
- Language:
- English
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Combustion measurements of an array of radial jet reattachment flames
Combustion measurements from an impinging radial jet reattachment flame