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Unsteady asymmetric engulfment regime in a T-mixer
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1.
1. D. Bothe, C. Stemich, and H. J. Warnecke, “Fluid mixing in a T-shaped micro-mixer,” Chem. Eng. Sci. 61, 29502958 (2006).
http://dx.doi.org/10.1016/j.ces.2005.10.060
2.
2. M. Hoffmann, M. Schlüter, and N. Räbiger, “Experimental investigation of liquid–liquid mixing in T-shaped micro-mixers using μ-LIF and μ-PIV,” Chem. Eng. Sci. 61, 29682976 (2006).
http://dx.doi.org/10.1016/j.ces.2005.11.029
3.
3. A. Soleymani, H. Yousefi, and I. Turunen, “Dimensionless number for identification of flow patterns inside a T-micromixer,” Chem. Eng. Sci. 63, 52915297 (2008).
http://dx.doi.org/10.1016/j.ces.2008.07.002
4.
4. S. K. R. Cherlo and S. Pushpavanam, “Effect of depth on onset of engulfment in rectangular micro-channels,” Chem. Eng. Sci. 65, 64866490 (2010).
http://dx.doi.org/10.1016/j.ces.2010.08.025
5.
5. A. Soleymani, H. Yousefi, W. Ratchananusorn, and I. Turunen, “Pressure drop in micro T-mixers,” J. Micromech. Microeng. 20, 015029 (2010).
http://dx.doi.org/10.1088/0960-1317/20/1/015029
6.
6. C. Galletti, M. Roudgar, E. Brunazzi, and R. Mauri, “Effect of inlet conditions on the engulfment pattern in a T-shaped micro-mixer,” Chem. Eng. J. 185–186, 300313 (2012).
http://dx.doi.org/10.1016/j.cej.2012.01.046
7.
7. G. Orsi, M. Roudgar, E. Brunazzi, C. Galletti, and R. Mauri, “Water-ethanol mixing in T-shaped microdevices,” Chem. Eng. Sci. 95, 174183 (2013).
http://dx.doi.org/10.1016/j.ces.2013.03.015
8.
8. A. Fani, S. Camarri, and M. V. Salvetti, “Investigation of the steady engulfment regime in a three-dimensional T-mixer,” Phys. Fluids 25, 064102 (2013).
http://dx.doi.org/10.1063/1.4809591
9.
9. R. J. Poole, M. Alfateh, and A. P. Gauntlett, “Bifurcation in a T-channel junction: Effects of aspect ratio and shear-thinning,” Chem. Eng. Sci. 104, 839848 (2013).
http://dx.doi.org/10.1016/j.ces.2013.10.006
10.
10. R. J. Santos and M. A. Sultan, “State of the art of mini/micro jet reactors,” Chem. Eng. Technol. 36, 937949 (2013).
http://dx.doi.org/10.1002/ceat.201200678
11.
11. S. Dreher, N. Kockmann, and P. Woias, “Characterization of laminar transient flow regimes and mixing in T-shaped micromixers,” Heat Transfer Eng. 30, 91100 (2009).
http://dx.doi.org/10.1080/01457630802293480
12.
12. A. Minakov, V. Rudyak, A. Dekterev, and A. Gavrilov, “Investigation of slip boundary conditions in the t-shaped microchannel,” Int. J. Heat Fluid Flow 43, 161169 (2013).
http://dx.doi.org/10.1016/j.ijheatfluidflow.2013.04.002
13.
13. S. Thomas and T. A. Ameel, “An experimental investigation of moderate Reynolds number flow in a T-channel,” Exp. Fluids 49, 12311245 (2010).
http://dx.doi.org/10.1007/s00348-010-0863-7
14.
14. S. Thomas, T. A. Ameel, and J. Guilkey, “Mixing kinematics of moderate Reynolds number flows in a T-channel,” Phys. Fluids 22, 013601 (2010).
http://dx.doi.org/10.1063/1.3283063
15.
15. A. Bottaro, P. Corbett, and P. Luchini, “The effect of base flow variation on flow stability,” J. Fluid Mech. 476, 293302 (2003).
http://dx.doi.org/10.1017/S002211200200318X
16.
16. F. Giannetti and P. Luchini, “Structural sensitivity of the first instability of the cylinder wake,” J. Fluid Mech. 581, 167197 (2007).
http://dx.doi.org/10.1017/S0022112007005654
17.
17. O. Marquet, D. Sipp, and L. Jacquin, “Sensitivity analysis and passive control of cylinder flow,” J. Fluid Mech. 615, 221252 (2008).
http://dx.doi.org/10.1017/S0022112008003662
18.
18. P. F. Fisher, “An overlapping Schwarz method for spectral element solution of the incompressible Navier-Stokes equations,” J. Comput. Phys. 133, 84101 (1997).
http://dx.doi.org/10.1006/jcph.1997.5651
19.
19. E. Åkervik, L. Brandt, D. S. Henningson, J. Hœpffner, O. Marxen, and P. Schlatter, “Steady solutions of the Navier-Stokes equations by selective frequency damping,” Phys. Fluids 18, 068102 (2006).
http://dx.doi.org/10.1063/1.2211705
20.
20. J. Jeong and F. Hussain, “On the identification of a vortex,” J. Fluid Mech. 285, 6994 (1995).
http://dx.doi.org/10.1017/S0022112095000462
21.
21. A. Fani, S. Camarri, and M. V. Salvetti, “Stability analysis and control of the flow in a symmetric channel with a sudden expansion,” Phys. Fluids 24, 084102 (2012).
http://dx.doi.org/10.1063/1.4745190
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/content/aip/journal/pof2/26/7/10.1063/1.4885451
2014-07-02
2014-09-18

Abstract

Unsteady flow regimes in a micro T-mixer are investigated. Direct numerical simulations (DNS) show that, in agreement with experimental and numerical results in the literature, when the Reynolds number is increased above a critical value larger than those typical of the steady engulfment regime, the flow remains asymmetric in the mean but becomes periodic in time. The dynamics of this regime is characterized by analyzing the evolution of the three-dimensional vortical structures forming at the confluence of the two inlet flow streams. As the Reynolds number is further increased, the flow remains time-periodic but it continuously switches between a symmetric configuration, similar to that of the vortical regime, and an asymmetric one, close to the engulfment configuration. Three-dimensional linear stability analysis is successively used to characterize the instability leading to the unsteady asymmetric regime, which is also interesting for applications due to its high mixing efficiency. The critical Reynolds number and the instability frequency are in very good agreement with those found in DNS. The sensitivity of this instability to a generic perturbation of the base flow is also investigated. It is shown that the largest sensitivity is to base-flow modifications introduced close to the three-dimensional vortical structures forming at the confluence between the inlet channels. Finally, the sensitivity analysis is specialized to investigate the effect of a generic perturbation of the inlet velocity profile.

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Scitation: Unsteady asymmetric engulfment regime in a T-mixer
http://aip.metastore.ingenta.com/content/aip/journal/pof2/26/7/10.1063/1.4885451
10.1063/1.4885451
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