Abstract
in which the terms containing the constant C account for the enhanced gas-to-surface heat transfer because of the cylindrical curvature, and those containing Lsy, the heated layer depth in the solid, account for a reduction in the solid volume preheated in the cylindrical compared to the flat geometry. The expression is tuned by comparison with complete numerical solutions to the flame spread problem from which the flame energy EFL is determined from the flat surface geometry and the constant C chosen from heat transfer correlations. Results compare favorably with numerical solutions for cylindrical spread in forced and natural flows and microgravity and with experiments on downward flame spread on cylindrical rods in normal gravity and microgravity.
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