Svmbol Definition 



a - attenuation constant ft.~- 



d = characteristic dimension ft. 



- convective heat transfer coefficient B.t.u./ft.^ - hr 



m = Keight loss rate lb. /sec. 



= total heat flux 3.t.u./ft. 



^T/A 



t - time ■ hr. 



tj^ = fuel bed depth - ft . 



= iveight of fuel per unit of load area Ib./ft.-^ 



X = separation distance ft. 



e = emissivitv of combustion zone 



c 



= emissivitv of flame zone 

 T} = horizontal convective heat transfer coefficient 



X = bed void volume-to-surface area ratio ft.^/ft.^ 



y = dynamic viscosity 



V = kinematic viscosity ft.^/sec. 



= bulk density of fuel bed Ib./ft.' 



= fuel particle density Ib./ft.^ 

 P = gas density , Ib./ft.^ 



= particle surface area-to-volume ratio ft.^/ft. 



a 



nr. 



= Stefan-Boltzman constant B.t.u./ft. - hr. 



20 



AFIC/HAF3, 0= 



