Pressure drop in micro T-mixers

Soleymani, Azita; Yousefi, Hamed; Ratchananusorn, Warin; Турунен, Илкка

doi:10.1088/0960-1317/20/1/015029

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…3. The friction factor ( f ) calculated by Soleymani et al 9 is in the range of 0.14–0.22 over the Re range of 100–200 30. The ξ calculated in this study may be converted to f by using the equation f = ( D h /2 L ) ξ .…”

Section: Model Validationmentioning

confidence: 75%

Numerical Investigation of Flow Patterns and Concentration Profiles in Y‐Mixers

et al. 2016

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The fluid flow patterns and associated concentration fields in Y-mixers are investigated using lattice Boltzmann method-based models. The focus lies on the impact of the mixing angle on the flow and concentration fields, with the mixing angle varying between acute (q = 10°) and obtuse (q = 130°) angles. Residence time distributions are determined to study the effect of the angles on the mixing and velocity patterns, in particular, different flow regimes, i.e., stratified laminar, vortex, and engulfment flow. The results from the simulations are validated with literature data and found to be in good agreement. Maximum mixing occurs in the 100°obtuse-angle Y-mixer, attributed to the extensive engulfment of flows in the mixing channel.

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Section: Model Validationmentioning

confidence: 75%

Numerical Investigation of Flow Patterns and Concentration Profiles in Y‐Mixers

et al. 2016

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“…A third order scheme (BDF3) is used for the nonlinear NavierStokes equations. The eigenvalue problem (2) and (5) have been solved by an Arnoldi iteration method ad hoc implemented by the authors in NEK5000. The linearized/adjoint version of the code has been used as a time-stepper, using a second order scheme (BDF2) for the time integration.…”

Section: Problem Description and Methodologymentioning

confidence: 99%

“…This leads to a considerable mixing efficiency, which motivates the interest in the literature for the engulfment regime (ER) (see, e.g., Refs. [1][2][3][4][5][6][7][8][9]. Geometrical parameters such as the width ratio between the outflowing and inlet channels W o /W and the width to height ratio W o /H have been found to have a significant impact on the value of the critical Reynolds number for engulfment regime (see, e.g., the review by Santos and Sultan 10 and the references therein).…”

Section: Introductionmentioning

confidence: 99%

Unsteady asymmetric engulfment regime in a T-mixer

2014

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

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“…This is why they have been intensively investigated in recent years [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. This is why they have been intensively investigated in recent years [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Split T‐Micromixers

et al. 2012

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Three-dimensional numerical simulations were performed to study the liquid flow inside split T-type micromixers, investigating the effects of various operating and design parameters on the mixing process. While for small Reynolds numbers, the mixing efficiency of a split T-micromixer is larger than that of a simple T-micromixer, it was found that, when Re = 100, mixing is further enhanced by the formation of vortex pairs. This is not only a function of the flow rate, but it depends also on the geometry of the device and on the ratio between the flow rates in the inlet sub-channels. In general, at a given flow rate, vertical splits induce a much better mixing than horizontal splits, while the reverse may occur for strongly unequal inlet flow rates.

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Pressure drop in micro T-mixers

Cited by 11 publications

References 14 publications

Numerical Investigation of Flow Patterns and Concentration Profiles in Y‐Mixers

Numerical Investigation of Flow Patterns and Concentration Profiles in Y‐Mixers

Unsteady asymmetric engulfment regime in a T-mixer

Numerical Study of Split T‐Micromixers

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