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Communication Dans Un Congrès Année : 2013

Experimental scalar spectra in chaotic advection

Résumé

We investigate scalar spectra in a Hele-Shaw cell, where mixing is achieved through chaotic advection. Even though the flow is almost 2D (the dependance in z is parabolic velocity profile), we recover features found numerically in 3D chaotic advection, that are also similar with what one would expect in a turbulent flow: a −1.1 power-law behavior is found at intermediate scales, while the spectrum decays exponentially at the smallest scales at which diffusion is effective. Moreover, a scaling in P e −1/2 (therefore in Sc −1/2) is found, which is consistent with the scaling of the Batchelor scalar dissipation scale.
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Dates et versions

hal-02096733 , version 1 (11-04-2019)

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  • HAL Id : hal-02096733 , version 1

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Cyril Mauger, Nathanaël Machicoane, Mickaël Bourgoin, Romain Volk, Florence Raynal. Experimental scalar spectra in chaotic advection. 14th European Turbulence Conference ETC 14, 2013, Lyon, France. ⟨hal-02096733⟩
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