Balance of Radiation Energy

For the radiation properties of gases, and for the effect of radiation on the balance of thermal energy, we need to know the equation governing the balance of radiation energy. The next section is devoted to the development of this equation. 

Problems involving gas radiation are significantly more complicated than those involving conduction, convection, and/or enclosure radiation. Consequently, the following discussion is restricted to one-dimensional problems. 

Consider a one-dimensional optical system involving an absorbing and emitting medium (Fig 10.2). The effect of scattering, which may be important in combustion 

Under radiative equilibrium, the radiation is uniform in space and dlk/ds = 0. Then Eq. (10.3) reduces to - 

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Our starting point is the balance of radiation energy (transfer equation), obtained from the average of Eq. (10.5) over the wavelength spectrum,... 

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