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1. Abstract
This study is the first in a series of reports onunderstanding the performance of fire fighter clothing, in protecting skin from thermal injury that results from exposure to high intensity thermalradiation. A detailed mathematical model is constructed to study transient heatand moisture transfer through multi-layered fabric assemblies with or withoutair gaps. The model accounts for changes in thermodynamic and transport properties of the fabric due to the presence of moisture. Numerical simulations are performed tostudy heat and mass transport through wet thermal liners (used in fire fighter protective clothing) when subjected to a radiative heat flux from a gas fired radiant panel.Results were found to compare well with experimental measurements. Thenumerical solutions are further analyzed to provide a detailed physicalunderstanding of the governing processes. Moisture in the cloth tends tovaporise upon heating and part of it recondenses in the interior of the cloth.It was observed that the temperature of the fabric layers and total heat fluxto the skin is significantly influenced by the amount of moisture and thedistribution of moisture in the protective clothing. Finally, simulations areperformed for a wet turnout coat assembly to demonstrate the flexibility of themodel for designing fire fighter protective clothing.
OriginallyPublished in: National Instituteof Standards and Technology
About the Authors:
Kuldeep Prasad, William Twilley & J. Randall Lawson areassociated with FireResearch Division,
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