The flame spread over thermally thin paper has been investigated in narrow channels with height of 14 mm and 10 mm by combined use of experiments and numerical simulations.Good agreement was found between the flame spread rate data obtained in normal gravity and microgravity conditions,indicating that the narrow channel apparatus in normal gravity reproduced the main characteristics of microgravity flames.Compared with typical normal gravity test channel(the height was relatively large),buoyancy was largely suppressed in narrow channels,and the maximum buoyant velocity was suggested to be about 5 cm/s.Additionally,the present numerical results showed that the effects of solid and gas phase radiations on flame spread depend on the magnitude of forced flow velocity.
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