Experimental Investigation of Transient Heat Transfer on a Solid Surface, with Fire Retardant Fabric Under Hot Air Impinging Jet

This paper represents an experimental investigation of the transient heat transfer on a solid base plate (mimic to skin) covered by fire retardant fabric (Kevlar® 49), under hot air jet impingement. The study was carried out by a fabricated attachment with an axial flow wind tunnel for horizontal hot air jet impingement. The hot air jet was impinged on a vertical base plate at different velocities and temperatures. A set of experimental conditions was considered to understand the various heat transfer phenomenon. The hot air jet temperatures were 115 and 125 °C respectively and jet velocities were 12, 15, and 19 ms−1 respectively at the exit point of the nozzle. The surface temperatures of the solid base plate are used to calculate the heat flux, local heat transfer coefficient, and Nusselt numbers. The maximum heat transfer is found on base plate, whilst the maximum decrease of heat flux is observed on fire retardant fabric. This experimental model can enhance the understanding and insights of the heat transfer process through permeable fabric.