Flammability and Gravity Effect of Horizontal and Vertical Propagating Flames in Tube

Celestine Ebieto Ebieto and Oku Nyong
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Celestine Ebieto Ebieto: Department of Mechanical Engineering, University of Port Harcourt, Nigeria
Oku Nyong: Department of Mechanical Engineering, Cross River University of Technology, Nigeria

European Journal of Engineering and Technology Research, 2020, vol. 5, issue 1, 20-26

Abstract: In the current research, experimental work is investigated for vertically and horizontally downward propagating flames in an open-ended tube. The objective was to study and compare the influence of flammability limits, gravity, and the flame speed in the different tube configuration for two different fuels. The experimental facility included a 20 mm inner diameter tube, 1200 mm in length and an optical access quartz tube made centrally of 700 mm in length. Methane-air and propane-air fuel were compared for both vertically and horizontally downward propagating flames. The flame speed at each equivalence ratios for both fuels was lower for the flame that propagates downward compared to the flame that propagates horizontally. For both fuels, the flammability limits tend to rise for the vertically downward flame. The influence of gravity was seen as the flames become leaner and richer in methane-air and propane-air flames that propagate vertically downwards, causing a transformation in the contour of the flame from a steady curved flame to a vibrating corrugated flame.

Keywords: Equivalence Ratio; Flame Speed; Flame Tube; Flammability Limit (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:epw:ejeng0:v:5:y:2020:i:1:id:61695

DOI: 10.24018/ejeng.2020.5.1.1695

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