Investigation of slip boundary conditions in the T-shaped microchannel

Минаков, А. В.; Rudyak, V. Ya.; Дектерев, А. А.; Gavrilov, A. A.

doi:10.1016/j.ijheatfluidflow.2013.04.002

Cited by 43 publications

(36 citation statements)

References 13 publications

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“…Importantly, such instabilities were found to enhance the mixing process: indeed, optimum mixing was achieved for 240 < Re < 700. The above findings were confirmed by Minakov et al (2012Minakov et al ( , 2013 who numerically investigated a T-mixer with Ä i = 1 and observed a periodic behavior for 240 < Re < 400, with Strouhal numbers 0.20 < St < 0.24. When 400 < Re < 1000, these authors observed a chaotic motion; however, upon increasing the length of the mixing channel, the oscillations were found to gradually fade away towards a laminar flow regime.…”

Section: Introductionsupporting

confidence: 55%

Flow regimes in T-shaped micro-mixers

Andreussi

Galletti

Mauri

et al. 2015

Computers & Chemical Engineering

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The different flow regimes occurring in T-mixers are investigated by means of direct numerical simulations. Three different values of the aspect ratio of the inlet channels, ki, that is their width to height ratio, are considered, namely ki= 0.75, 1 and 2. For the configurations with ki= 0.75 and 1, the same behavior as previously described in the literature, is found. In particular, as the Reynolds number is increased, the flow evolves from vortical to engulfment steady regimes, then to unsteady asymmetric and symmetric periodic regimes, until, finally, it becomes chaotic. All the critical values of the Reynolds number, at which the transitions between the different regimes occur, are found to be very similar for ki= 0.75 and 1, while some differences are highlighted in the vorticity dynamics and characteristic frequencies of the unsteady regimes. The observed scenario is completely different for ki= 2. Indeed, in this case, the flow evolves directly from the vortical regime to an unsteady symmetric behavior, with a vorticity dynamics that is significantly different from those observed for the other aspect ratios

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Section: Introductionsupporting

confidence: 55%

Flow regimes in T-shaped micro-mixers

Andreussi

Galletti

Mauri

et al. 2015

Computers & Chemical Engineering

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“…A detailed description of the program numerical algorithm is given in [20][21]. The possibility of its use for simulation of mini-and microchannel flow is shown in [22]. Noted here the main points of the numerical techniques.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

The experimental and theoretical study of laminar forced convection of nanofluids in the round channel

Минаков

Lobasov

Guzei

et al. 2015

Applied Thermal Engineering

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“…These algorithms have been tested on a wide range of problems of internal and external flow [12][13][14][18][19][20][21][22][23][24][25], including simulations of microflows [12,[22][23][24][25].…”

Section: Algorithm For Solving the Navier-stokes Equationsmentioning

confidence: 99%

“…Systematic data on the flow and mixing regimes in such micromixers were obtained in [22,35]. In the present study, a hydrodynamic simulation was performed for various flow regimes in a T-type micromixer at Reynolds numbers Re = (ρUh/μ) from one to one thousand.…”

Section: Fluid Mixing At Moderate Reynolds Numbersmentioning

confidence: 99%

Modeling and Optimization of Y-Type Micromixers

Rudyak

Минаков

2014

Micromachines

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A trend in the global technological progress in the last few decades is the development of microsystem technology, microelectromechanical systems and corresponding technologies. Fluid mixing is an extremely important process widely used in various microfluidic devices (chemical microreactors, chemical and biological analyzers, drug delivery systems, etc.). To increase the mixing rate, it is necessary to use special devices: micromixers. This paper presents the results of a hydrodynamic simulation of Y-shaped micromixers. Flows are analyzed for both low and moderate Reynolds numbers. The passive and active mixers are considered. The dependence of the mixing efficiency on the Reynolds and Péclet numbers, as well as the possibility of using the hydrophobic and ultra-hydrophobic coatings is analyzed. Five different flow regimes were identified: (1) stationary vortex-free flow (Re < 5); (2) stationary symmetric vortex flow with two horseshoe vortices (5 < Re < 150); (3) stationary asymmetric vortex flow (150 < Re < 240); (4) non-stationary periodic flow (240 < Re < 400); and (5) stochastic flow (Re > 400). The maximum mixing efficiency was obtained for stationary asymmetric vortex flow.

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Investigation of slip boundary conditions in the T-shaped microchannel

Cited by 43 publications

References 13 publications

Flow regimes in T-shaped micro-mixers

Flow regimes in T-shaped micro-mixers

The experimental and theoretical study of laminar forced convection of nanofluids in the round channel

Modeling and Optimization of Y-Type Micromixers

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