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Abstract     This paper deals with the modelling of the heat transfer process in a thin porous fibrous material such as a paper   sheet when it is subjected to an incident heat flux introduced by a laser beam. A mathematical model based on   the control volume principle is developed for numerical estimation of radial temperature distribution which is   validated experimentally by infrared thermography. Here the heat flux is introduced by a CO2 laser beam of 10.6   μm wavelength and an infrared image sequence is recorded as a function of time with a high resolution infrared   camera. The preliminary validation results indicate that the simulation model can predict the transient   development of sheet temperature very accurately under the specified heating conditions. The model can   enhance our understanding and insights of the heat transfer process in such media, which is of great interest for   many drying and thermal applications. Though the application shown here is on a 0.1 mm thick paper sheet, the   model can be extended to any thin porous fibrous media such as textiles and nonwovens.

HEAT TRANSFER IN THIN POROUS FIBROUS MATERIAL: MATHEMATICAL MODELLING AND EXPERIMENTAL VALIDATION USING ACTIVE THERMOGRAPHY