Infrared (IR) radiation is used for heating/drying of moist paper in the paper making process owing to its penetration characteristic inside porous media and a high absorptivity of water in the IR wavelength range. However, there is a lack of fundamental understanding of the transport phenomena occurring within moist paper during IR heating/drying. A series of experiments has been conducted along with the development of a theoretical model to fundamentally understand IR heating/drying of moist paper. The experimental results confirm the IR radiation energy penetration into the paper sheet and the theoretical analysis indicates that the penetration depth decreases with increasing sheet moisture content.

Issue Section:
Evaporation, Boiling, and Condensation
Keywords:
paper, drying, heating, convection, flow through porous media, paper industry, electromagnetic wave propagation, Drying, Emitting, Heat Transfer, Moisture, Porous Media, Radiation
Topics:
Drying, Heating, Radiation (Physics), Water, Temperature, Infrared radiation, Weight (Mass), Porous materials
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