Abstract
The polymer materials are widely used in various occasions, of which polymethyl methacrylate(PMMA) is used in architectural transparent roofs, telephone booths, stairs, and their fire risk is getting more and more attention. The ignition conditions （critical surface temperatures and critical mass flow rates） of polymer materials have extensively researched, but their internal heat transfer studies have been relatively rare, especially in wind environments. Considering that internal heat transfer research is important for the heat transfer of multi-layer materials, the study of heat transfer inside materials is also worthy of attention. In this work, we found that in-depth absorption theory is more suitable for solid pyrolysis models under wind conditions. An absorption coefficient depends with temperature are assumed, and it fits better than the constant absorption coefficient. In addition, this work made some improvements to the ignition model by employing the theory of in-depth absorption.
Highlights
Polymers have found many applications in construction, such as polymethyl methacrylate commonly used in the transparent roof of buildings, but their fire hazard is worrying
Quintiere [1], Yang [2,3] and Tsai [4] studied the pyrolysis of different types of solid combustibles under various radiant heat fluxes and obtained the relationship between ignition time and radiant heat flux
Hallman et al [5] found that ignition delay time is strongly influenced by surface absorption
Summary
Polymers have found many applications in construction, such as polymethyl methacrylate commonly used in the transparent roof of buildings, but their fire hazard is worrying. The forced convection of air flow promotes the thermal plume to take away heat and produces a direct cooling effect on the surface of combustibles. It may affect the ignition mechanism but few relevant articles can be found. Quintiere [1], Yang [2,3] and Tsai [4] studied the pyrolysis of different types of solid combustibles under various radiant heat fluxes and obtained the relationship between ignition time and radiant heat flux. Linteris et al [8] obtained the in-depth absorption coefficients of PMMA under different external heat fluxes and averaged them to 1870
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