| OCR Text |
Show 2.1 .26 NOMENCLATURE Symbols A pre-exponential factor a0 initial thermal diffusivity of the particle, X0/p0 co C, ratio of heat conductivities, A, i/A, C" heat capacity flow rate/area, m"c c specific heat E activation energy Fo Fourier number, dimensionless time, a0t/R2 G . dimensionless constant, p c ao/A, nk ' Mgn gn ° k H, dimensionless concentrated heat of phase change on the iso-therm Tk, (pgk VPk-1Ck-1 < V T k - 1 > > a»^kT» h convective heat transfer coefficient c h convective heat transfer coefficient without the effect of CO the vapour efflux h. enthalpy of the substance i 1, heat of vaporization, heat of pyrolysis, (T, is the reference temperature) m transient mass of the particle m0 initial dry mass of the particle m mass flow rate of the gases and steam leaving the particle m" local mass flow rate/area q heat flux R half thickness of a plate, radius of a cylinder or a sphere, the ideal gas constant in eq. (12) R, the transient location of the isotherm k k r coordinate from the center plane, line or point S particle surface area St Stanton number, h /C" T temperature (in Kelvins) T0 initial temperature of the particle (in Kelvins) T temperature of the radiative surfaces surrounding the particle t time u initial moisture content of the particle, mass of water/ initial dry mass |
