F. N. Frenkiel
Advances in Applied Mechanics
Publisher Summary This chapter discusses one aspect of turbulent phenomena: turbulent diffusion, which has a wide field of application in fluid dynamics, chemical engineering, heat transfer, meteorology, etc.; and it mainly focuses on diffusion in a field of homogeneous and isotropic turbulence in which the decay of turbulence is neglected. The theory of turbulent diffusion investigates the motion of fluid elements that do not preserve an individual identity. Dispersion in fluids is concerned with the motion of material particles, which depends on the character of the turbulent field and on the nature of the particles themselves. The chapter also describes the statistical description of a turbulent field, fundamental equation of turbulent diffusion, mean concentration distribution produced by a point source of diffusion, mean concentration distribution produced by an infinite line source of diffusion, differential equations of diffusion ,and statistical theory of turbulence.