Taylor microscales scalar

Like the velocity spatial correlation function discussed in Section 2.1, the scalar spatial correlation function provides length-scale information about the underlying scalar field. For a homogeneous, isotropic scalar field, the spatial correlation function will depend only on r = r, i.e., R,p(r, t). The scalar integral scale L and the scalar Taylor microscale >-,p can then be computed based on the normalized scalar spatial correlation function fp, defined by... [Pg.89]

Moreover, like the relationship between the turbulence Taylor microscale and the dissipation rate e, X t) is related to the scalar variance decay rate by17... [Pg.89]

The scalar Taylor microscale is thus related to the mixing time i.e., tmix = k /6r. [Pg.89]

In general, the scalar Taylor microscale will be a function of the Schmidt number. However, for fully developed turbulent flows,18 l.,p L and /, Sc 1/2Xg. Thus, a model for non-equilibrium scalar mixing could be formulated in terms of a dynamic model for Xassociated with working in terms of the scalar spatial correlation function, a simpler approach is to work with the scalar energy spectrum defined next. [Pg.90]

Big Chemical Encyclopedia