MICROSCALES OF TURBULENT COMBUSTION

摘要

A novel approach leading to the microscales of complex turbulent flows is reviewed. The approach is illustrated in terms of the classical microscales proposed by Taylor, Kolmogorov, Oboukhov-Corrsin and Batchelor. A thermal mesomicroscale between the Kolmogorov and Batchelor scales, μ_θ=(η η_B~2)~(1/3) is introduced. Here η and η_B, respectively, denote the Kolmogorov and Batchelor scales, v and α the kinematic and thermal diffusivities, and ε the rate of turbulent mechanical energy per unit mass. The foundations of the well-known correlation for forced convection over a flat plate, Nu_l～Re_l~(3/4) Pr~(1/3), l being an integral scale, is interpreted in terms of l, η and η_θ.