# Buoyancy Effects on Concurrent Flame Spread Over Thick PMMA

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### "Buoyancy Effects on Concurrent Flam..." refers background in this paper

...Selecting as characteristic pyrolysis length half of the sample length results in a heat flux at the solid surface that would correspond to that in the middle of the sample which is a small varying zone of its value [50], thus the impact of the approximation is relatively small....

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...transfer coefficient along a solid surface is not uncommon in heat transfer [50]....

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...The boundary layer thickness is determined through the Reynolds number (Re) in pure forced flow, or through the Grashof number (Gr) in pure natural convection (free) flow [50]....

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...This approximation is somewhat reasonable because the growth of the boundary layer, and in turn the flame stand-off distance, is moderate since the boundary layer thickness grows with a 1/2 to 1/4 power of the distance from the sample leading edge [50]....

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### "Buoyancy Effects on Concurrent Flam..." refers background in this paper

...[53] as the sample size increases and the flames become more turbulent the radiant flux becomes more important eventually dominating the heat transfer from the flame to the solid....

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...(diffusive transport and radiation losses) [51-54]....

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