J. Phys. IV France 125 (2005) 845-848
Effect of moisture take-up on the effusivity and ignition of dry fibrous carbon-based materialsJ. Gibkes1, F. Macedo2, B.K. Bein1 and J. Pelzl1
1 Exp. Physics III, Solid State Spectroscopy, Ruhr-University, 44780 Bochum, Germany
2 Faculty of Physics, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
The moisture take-up from the humid atmosphere and its effect on the effective thermal properties of dry fibrous carbon-based material have been measured with the help of modulated IR radiometry. For the measured samples, black graphitized paper, the results are independent of the emissivity, and the observed changes mainly refer to the effective thermal properties. The effects of moisture take-up are analyzed with respect to thermal effusivity, thermal diffusivity, and two specific thermal parameters (surface area heat capacity, thermal conductivity per sample thickness), which are relevant in surface heating processes in cylindrical geometry.
© EDP Sciences 2005