煤量甏圆家重点实验宝 Chapter 6 Radiation Heat Transfer 8 1 The Equation of Radiation Transfer 1. Attenuation by Absorption and Scattering 1)Absorption (6-1) n/abs 77-7 Where Kn- linear absorption coefficient Over a geometric path s 040g0(c National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn Chapter 6 Radiation Heat Transfer §1 The Equation of Radiation Transfer 1. Attenuation by Absorption and Scattering 1) Absorption (dI ) I ds abs = − (6-1) Where Kη - linear absorption coefficient Over a geometric path s ( ) ( ) ( ) − = = I s I ds I e s 0 exp 0 0 (6-2)
煤量甏圆家重点实验宝 aral. Scattered phe 八∧ Photons Absorbed photons √A产 Transmitted photons ds FIGURE 8-2 Attenuation of radiative intensity by absorption and scattering National Lab, of Coal Combustion, HUST Wuhan 430074P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn
煤量甏圆家重点实验宝 Where ,x,ds Is optical thickness Absorbtivity (6-3) 7 2)Scattering difference between absorption and scattering n /sca (6-4) National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn Where ds s = 0 Is optical thickness Absorbtivity: ( ) ( ) ( ) − = − − e I I I s 1 0 0 (6-3) 2) Scattering difference between absorption and scattering (dI ) I ds s sca = − (6-4)
煤烧圆家重点实验宝 3)Total attenuation extinction coefficient =K +O 77 7 Optical distance based on extinction B,ds (6-6) National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn 3) Total attenuation extinction coefficient = + s Optical distance based on extinction (6-5) = s ds 0 (6-6)
煤烧圆家重点实验宝 2. Augmentation by Emission and Scattering ) Emission nvem Kni bn (6-7) Combined eqs(6-1)and(6-7) for an absorbing emitting medium n bn (6-8) 7 National Lab, of Coal Combustion. HUST Wuhan 430074 P R CHINA E-mail:pcbnlcc@hust.edu.cn
NL CC National Lab. of Coal Combustion, HUST Wuhan 430074, P. R. CHINA E-mail: pcbnlcc@hust.edu.cn 2. Augmentation by Emission and Scattering 1) Emission (dI ) I ds b em = (6-7) Combined eqs (6-1) and (6-7) for an absorbing - emitting medium ( ) I I ds dI = b − (6-8)