Turbulent flow will be the subject of research during this period and near
future and hundreds of papers and articles are being published every year.
In this chapter, we emphasize on the physics side of turbulent flow with the
engineering application, nature of turbulent, methods on analysis, diffusivity of
turbulence, length scales in turbulent flows, energy and vorticity and their relation
with length scale.
Diffusive and convective length scales and their relation with boundary thickness at
the laminar and turbulent region and a comparison between them are presented in
details.
Keywords: Diffusivity, Energy and vorticity, Length scales, Nature of turbulent.
