Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

S. Chander
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India

A. K. Das
Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur-721302, India

A. Jain
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India

A. Ray
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India

An experimental study has been conducted to investigate the effect of slot burner aspect ratio (ratio of length to width of slot burner) on heat transfer characteristics for methane/air flame impinging normally on a flat surface. Three aspect ratios were considered, viz., 5.08, 2.77 and 1.54. Equivalent diameter of 12.7 mm was kept same for all slot burners. Results were also compared with tube burner with same exit diameter. Effects of Reynolds number (800−1300) and dimensionless separation distance (H/d_e = 1.5−5) on heat transfer characteristics for different slot burners were investigated. It has been observed that the heat transfer characteristics were intimately related to the proximity of the flame inner reaction cone with target surface. Heat flux was more concentrated in the stagnation region for round tube burner and also for low aspect ratio slot burner. For the slot burner itself the heat fluxes in X (along the length of the slot section) and Y (along the width) directions were different. Two off-centered peaks in the heat flux were observed along Y-direction (minor axis). Heating was more uniform in X-direction as compared to Y-direction. Slot burners gave more uniform heat flux distribution on the surface as compared to round tube burner. Amongst the slot burners, one with largest aspect ratio gave most uniform heat flux distribution.

COM-29 pages DOI: 10.1615/IHTC13.p26.270 Download article

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