We can divide the equation by a and differentiate a second time to obtain the radiation diffusion equation, cf. eqn (6.95), on replacing the derivative of H in terms of J from eqn (6.114)
where a = 1/3a and b = ¡3/a. For the case of isotropic scattering, g = 0, and for no incoming solar flux a =1/3 and b = 0, and so we obtain the radiation diffusion equation given by eqn (6.97).
If we now substitute for the source function Sx from eqn (6.116) we get a second-order differential equation
Was this article helpful?
Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.