منابع مشابه
Effective Diffusivity in Baroclinic Flow
Large-scale chaotic stirring stretches tracer contours into filaments containing fine spatial scales until smallscale diffusive processes dissipate tracer variance. Quantification of tracer transport in such circumstances is possible through the use of Nakamura’s ‘‘effective diffusivity’’ diagnostics, which make clear the controlling role of stirring, rather than small-scale dissipation, in lar...
متن کاملEffective Isentropic Diffusivity of Tropospheric Transport
Tropospheric transport can be described qualitatively by the slow mean diabatic circulation and rapid isentropic mixing, yet a quantitative understanding of the transport circulation is complicated, as nearly half of the isentropic surfaces in the troposphere frequently intersect the ground. A theoretical framework for the effective isentropic diffusivity of tropospheric transport is presented....
متن کاملThe effective diffusivity of cellular flows
In the previous chapter we dealt with unidirectional flows. Now we turn to the slightly more complicated case of incompressible two-dimensional cellular flows. The velocity field can be obtained from a streamfunction ψ(x, y) according to our usual convention u = (u, v) = (−ψy, ψx). The domain is a periodic array of square cells, each with side , so that the streamfunction has the periodicity ψ(...
متن کاملEffective diffusivity of passive scalars in rotating turbulence.
We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis are obtained by studying the diffusion of an imposed initial profile for the passive scalar, and calculated by measuring the scalar average concentration and average spa...
متن کاملRobustness of an Effective Diffusivity Diagnostic in Oceanic Flows
The robustness of Nakamura’s effective diffusivity diagnostic for quantifying eddy diffusivities of tracers within a streamwise-average framework is carefully examined in an oceanographic context, and the limits of its applicability are detailed. The near-surface Southern Ocean geostrophic flow, obtained from altimetric observations, is chosen for particular examination since it exhibits strong...
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ژورنال
عنوان ژورنال: Chemical engineering
سال: 1967
ISSN: 0375-9253
DOI: 10.1252/kakoronbunshu1953.31.485