The Proceedings of the Thermal Engineering Conference
Online ISSN : 2424-290X
2020
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Effect of heat transfer through wire core toward unburned region on the extinction of spreading flame over electric wires
Yusuke KonnoNozomu HashimotoOsamu Fujita
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Pages 0059-

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Abstract

The effects of core material on the extinction characteristics of the flame spreading over electric wires have been investigated. The theoretical analysis reveals that heat loss in the unburned zone has a negative feedback mechanism for the flame spread process. The reduction of the flame spread rate increases heat loss in the unburned zone and induces the quenching extinction as a result of extended thermal diffusion length. It is also found that a highly conductive wire increases heat loss rather than poorly conductive wire even under the same flame spread rate. Lastly, applicable conditions of the model are discussed based on the correlation between the thermal boundary layer and the stand-off distance of the spreading flame.

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© 2020 The Japan Society of Mechanical Engineers
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