Analysis of a cross-channel micromixer through the dynamics of tracer gradient

• Autorzy: Gonzalez M.

Identyfikatory

DOI

10.15632/jtam-pl.54.4.1257

• Języki publikacji: EN

Abstrakty

EN

The study aims at showing how the dynamics of tracer gradient accounts for the stirring mechanism produced by a periodically forced flow relevant to practical mixing operation. The numerical simulation uses the equations for the orientation and norm of the tracer gradient and an analytic model for velocity. To a large extent, the micromixer properties over different ranges of the Strouhal number are explained through the response of the tracer gradient orientation to the tilting of strain principal axes resulting from flow forcing. The analysis also reveals a rich picture of stirring as the Strouhal number is varied.

Słowa kluczowe

EN

Low-Reynolds number flows; mixing enhancement; micromixers

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2016
• Tom: Vol. 54 nr 4
• Strony: 1257--1269
• Opis fizyczny: Bibliogr. 14 poz., rys.

Twórcy

autor

Gonzalez M.

• CNRS, UMR 6614/CORIA, Site Universitaire du Madrillet, Saint-Etienne du Rouvray, France

Bibliografia

• 1. Capretto L., Cheng W., Hill M., Zhang X., 2011, Micromixing within microfluidic devices, Topics in Current Chemistry, 304, 27-68
• 2. Garcia A., Gonzalez M., Paranthoen P., 2005, On the alignment dynamics of a passive scalar gradient in a two-dimensional flow, Physics of Fluids, 17, 117102
• 3. Garcia A., Gonzalez M., Paranthoen P., 2008, Nonstationary aspects of passive scalar gradient behaviour, European Journal of Mechanics B/Fluids, 27, 433-443
• 4. Gonzalez M., Paranthoen P., 2010, On the role of unsteady forcing of tracer gradient in local stirring, European Journal of Mechanics B/Fluids, 29, 143-152
• 5. Lapeyre G., Hua B.L., Klein P., 2001, Dynamics of the orientation of active and passive scalars in two-dimensional turbulence, Physics of Fluids, 13, 251-264
• 6. Lapeyre G., Klein P., Hua B.L., 1999, Does the tracer gradient vector align with the strain eigenvectors in 2D turbulence?, Physics of Fluids, 11, 3729-3737
• 7. Lee C.-Y., Chang C.-L., Wang Y.-N., Fu L.-M., 2011, Microfluidic mixing: a review, International Journal of Molecular Sciences, 12, 3263-3287
• 8. Lee Y.-K., Shih C., Tabeling P., Ho C.-M., 2007, Experimental study and nonlinear dynamic analysis of time-periodic micro chaotic mixers, Journal of Fluid Mechanics, 575, 425-448
• 9. Nguyen N.-T., Wu Z., 2005, Micromixers – a review, Journal of Micromechanics and Microengineering, 15, R1-R16
• 10. Niu X., Lee Y.-K., 2003, Efficient spatial-temporal chaotic mixing in microchannels, Journal of Micromechanics and Microengineering, 13, 454-462
• 11. Okkels F., Tabeling P., 2004, Spatiotemporal resonances in mixing of open viscous fluids, Physical Review Letters, 92, 038301
• 12. Okubo A., 1970, Horizontal dispersion of floatable particles in the vicinity of velocity singularities such as convergences, Deep-Sea Research, 17, 445-454
• 13. Tabeling P., Chabert M., Dodge A., Jullien C., Okkels F., 2004, Chaotic mixing in crosschannel micromixers, Philosophical Transactions of the Royal Society of London A, 362, 987-1000
• 14. Weiss J., 1991, The dynamics of enstrophy transfer in two-dimensional hydrodynamics, Physica D, 48, 273-294

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniajacą naukę.