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• W2022044861 startingPage "035106" @default.
• W2022044861 abstract "Turbulent fluid flows have long been recognized as a superior means of diluting initial concentrations of scalars due to rapid stirring. Conversely, experiments have shown that the structures responsible for this rapid dilution can also aggregate initially distant reactive scalars and thereby greatly enhance reaction rates. Indeed, chaotic flows not only enhance dilution by shearing and stretching but also organize initially distant scalars along transiently attracting regions in the flow. To show the robustness of this phenomenon, a hierarchical set of three numerical flows is used: the periodic wake downstream of a stationary cylinder, a chaotic double gyre flow, and a chaotic, aperiodic flow consisting of interacting Taylor vortices. We demonstrate that Lagrangian coherent structures (LCS), as identified by ridges in finite time Lyapunov exponents, are directly responsible for this coalescence of reactive scalar filaments. When highly concentrated filaments coalesce, reaction rates can be orders of magnitude greater than would be predicted in a well-mixed system. This is further supported by an idealized, analytical model that was developed to quantify the competing effects of scalar dilution and coalescence. Chaotic flows, known for their ability to efficiently dilute scalars, therefore have the competing effect of organizing initially distant scalars along the LCS at timescales shorter than that required for dilution, resulting in reaction enhancement." @default.
• W2022044861 created "2016-06-24" @default.
• W2022044861 creator A5039369482 @default.
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• W2022044861 date "2015-03-01" @default.
• W2022044861 modified "2023-10-07" @default.
• W2022044861 title "Reaction enhancement of initially distant scalars by Lagrangian coherent structures" @default.
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• W2022044861 doi "https://doi.org/10.1063/1.4914467" @default.
• W2022044861 hasPublicationYear "2015" @default.
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