MIXING ENHANCEMENT BY FREQUENCY-SELECTIVE CHAOTIC ADVECTION IN A 3-D TIME-PERIODIC STOKES FLOW

Autor:	Rui C. R. Rodrigues, E. Saatdjian, N. F. C. Formiga, José P. B. Mota, A. J. S. Rodrigo
Rok vydání:	2006
Předmět:	Advection General Chemical Engineering Chaotic General Chemistry Mechanics Stokes flow Hagen–Poiseuille equation Physics::Fluid Dynamics Chaotic mixing Classical mechanics Hele-Shaw flow Flow (mathematics) Mixing (physics) Mathematics
Zdroj:	Chemical Engineering Communications. 193:743-753
ISSN:	1563-5201 0098-6445
DOI:	10.1080/00986440500267139
Popis:	A new 3-D periodic Stokes flow has been imagined and realized experimentally. It consists of axial Poiseuille flow superimposed on the 2-D tangential motion between two confocal ellipses that glide circumferentially so that the geometry is invariant. Chaotic streak lines obtained experimentally are compared to numerical simulations of this time-periodic flow. We next turn our attention to the problem of determining how to move the boundaries in order to obtain the most efficient mixing. Using a numerical experiment to study the advection of a passive scalar, we show that for a given 3-D mixer geometry and flow rate there is an optimum modulation frequency of the boundary displacement protocol for which the mixing process is most efficient. Furthermore, it is shown that chaotic advection can be regarded as a frequency-selective amplifier. This behavior is similar to that of fluid instability where external perturbations are amplified for a certain frequency range. For values above or below this ra...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::09af3f80869b1e2c941ba5ff0684e704 https://doi.org/10.1080/00986440500267139 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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