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• W1970930848 abstract "In this paper we consider the convection-diffusion problem of a passive scalar in Lagrangian coordinates, i.e., in a coordinate system fixed on fluid particles. Both the convection-diffusion partial differential equation and the Langevin equation are expressed in Lagrangian coordinates and are shown to be equivalent for uniform, isotropic diffusion. The Lagrangian diffusivity is proportional to the square of the relative change of surface area and is related to the Eulerian diffusivity through the deformation gradient tensor. Associated with the initial value problem, we relate the Eulerian to the Lagrangian effective diffusivities (net spreading), validate the relation for the case of linear flow fields, and infer a relation for general flow fields. Associated with the boundary value problem, if the scalar transport problem possesses a time-independent solution in Lagrangian coordinates and the boundary conditions are prescribed on a material surface/interface, then the net mass transport is proportional to the diffusion coefficient. This can be also shown to be true for large Peclet number and time-periodic flow fields, i.e., closed pathlines. This agrees with results for heat transfer at high Peclet numbers across closed streamlines." @default.
• W1970930848 created "2016-06-24" @default.
• W1970930848 creator A5016247285 @default.
• W1970930848 creator A5070704854 @default.
• W1970930848 date "2007-04-28" @default.
• W1970930848 modified "2023-09-25" @default.
• W1970930848 title "Diffusion and Brownian motion in Lagrangian coordinates" @default.
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• W1970930848 doi "https://doi.org/10.1063/1.2717185" @default.
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