Radiative Entropy Production—Heat Lost to Entropy

Abstract

Publisher Summary This chapter deals with entropy production resulting from temperature differences. This thermal conduction energy is the lost heat that goes into entropy production. All forms of entropy production result from dissipative processes involving mass, species, momentum, heat transfer, and electromagnetic or nuclear transport. It is observed that the dissipation can have a diffusive or hysteretic origin, the diffusion being directional and the hysteresis being cyclic. The majority of dissipative processes, including the dissipation of radiation, are diffusive in nature. The chapter explores the thermodynamic foundations of entropy production and briefly reviews radiative stress and develops the local entropy production in terms of this stress. Further, the chapter illustrates entropy production in a stagnant gas and develops a qualitative understanding of radiative heat transfer. It also discusses the relation between entropy production and heat transfer, and the maximum entropy production at flame quenching. The microscales of turbulence and radiation-affected turbulence are presented.