Computational Characterization of Turbulent Flow in a Microfluidic Actuator

Laı́n, Santiago; Lozano-Parada, Jaime H.; Guzmán, Javier

doi:10.3390/app12073589

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…In our previous work, we used the SST k –ω model and found that the model under-predicted the jet oscillation frequency by almost 10%. Similar underprediction was reported by Bobusch et al and Hossain et al However, overprediction of jet oscillation frequency is also reported in the literature. ,, Laín et al used the SST k –ω model for the 2D case and found that their predicted oscillation frequencies obtained were within the experimental error bars reported by Bobusch et al and 3D hybrid DES simulation by Baghaei et al Overprediction of the jet oscillation frequency was also reported with the use of k –ε, RNG, k –ε, and k –ω compared to SST k –ω.…”

Section: Computational Modelingsupporting

confidence: 78%

Jet Oscillations and Mixing in Fluidic Oscillators: Influence of Geometric Configuration and Scale

Madane

Ranade

2023

Ind. Eng. Chem. Res.

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Fluidic oscillators (FOs) harness inherently oscillating jets for improving mixing, heat, and mass transfer and offer an attractive device platform for a wide range of applications. Despite several promising applications of FOs, the influence of their design and scale on the resulting jet oscillations and mixing has not been systematically studied. In this work, we investigated the influence of geometric configuration and device scale on jet oscillation frequency, flow, mixing, and residence time distribution (RTD). Initially, flow in FO was simulated using a two-dimensional computational fluid dynamics (CFD) model for exploring a wider parameter space. These simulations indicated that the distance of the backflow limb from the inlet and device scale are the most important design parameters influencing the jet oscillation frequency. Detailed three-dimensional CFD simulations were then carried out for the shortlisted configurations of the FO. The shortlisted configurations were fabricated, and experimental measurements of jet oscillations were carried out. The jet oscillation frequency was measured using acquired pressure fluctuation data and fast Fourier transforms. The simulated results were compared with the experimental data. The validated CFD model was then used to evaluate various flow features of FO, mixing, and liquid and solid RTD considering potential applications. The presented results will be useful for identifying suitable design and operating parameters of the FO for a variety of processes and applications.

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Section: Computational Modelingsupporting

confidence: 78%

Jet Oscillations and Mixing in Fluidic Oscillators: Influence of Geometric Configuration and Scale

Madane

Ranade

2023

Ind. Eng. Chem. Res.

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“…Thus, the hydraulic characteristics of curved flow have been an important subject in river dynamics. Research on open channel bends mainly focuses on water surface line, three-dimensional velocity, pressure distribution, turbulent kinetic energy, and shear stress [1][2][3][4][5].…”

Section: Research Backgroundmentioning

confidence: 99%

Large-Eddy Simulation of Hydrodynamic Structure in a Strongly Curved Bank

Ning

2022

Applied Sciences

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Advances in computer technology have facilitated the use of large-eddy simulation (LES) as a numerical simulation method in fluid mechanics. In this study, LES was used for the numerical simulation of curved water flow with a large curvature. The simulation results show that water separation occurs near the convex bank of the bend transverse section while the separation area increases and then decreases along the water depth direction, where the peak is at half-depth. As the water surface is affected by air shear stress, the velocity decreases. However, as the gradient increases, the vorticity is larger and the vorticity distribution is more even. Reflux occurs in the inlet and outlet sections of the bend but does not occur on the surfaces of z/H = 0.5 and z/H = 0.2, where the vorticity distribution is uneven. In the narrow corridor of the concave and convex banks, notably near the curved top, vorticity distribution is concentrated with a high intensity. At the center of the curve, the vorticity intensity is weak but 10 times higher at the concave and convex banks. A strong correlation exists between circulation structure and vorticity distribution: the vorticity is large where the circulation is intense and the structure is complex.

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“…Their results indicated that a harmonically oscillating primary flow was generated, increasing the mixing entrainment and momentum transfer while reducing the pressure in the suction and mixing chambers. A microfluidic actuator was studied at high Reynolds numbers in [31], where 2D-URANS simulations along with experimental results and a final 3D CFD simulation was performed. Coherent structures as well as turbulent kinetic energy fields and velocity contours were used to unveil the associated complex fluid dynamics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications

Karimzadegan,

Mirzaei,

Bergada

2024

Applied Sciences

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To activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection, and the momentum coefficient, need to be tuned. Presently, two main devices are capable of injecting pulsating flow with a momentum coefficient sufficient to delay the boundary layer separation: these are zero-net-mass-flow Actuators (ZNMFAs) and fluidic oscillators (FOs). In the present study, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, and fluid is considered to be incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effects of dimensional modifications on outlet width and mixing chamber wedge inclination angle are addressed. Modifications of the outlet width were observed to create large variations in FO performance. The origin of self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact, we can conclude by saying that the current FO configuration is pressure-driven, although the mass flow forces appear to be much more relevant than in previously studied FO configurations.

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Computational Characterization of Turbulent Flow in a Microfluidic Actuator

Cited by 4 publications

References 25 publications

Jet Oscillations and Mixing in Fluidic Oscillators: Influence of Geometric Configuration and Scale

Jet Oscillations and Mixing in Fluidic Oscillators: Influence of Geometric Configuration and Scale

Large-Eddy Simulation of Hydrodynamic Structure in a Strongly Curved Bank

Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications

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