Investigation on flow mechanism and impingement heat transfer performance of combined fluidic oscillators

Sang, Yongjun; Shan, Yongkui; Zhang, Jingzhou; Tan, Xiaoming

doi:10.1016/j.tsep.2022.101564

Cited by 4 publications

(1 citation statement)

References 26 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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Phosphor thermometry evaluation of heat transfer enhancement on a hot plate achieved by a vortex-based fluidic oscillator

Joulaei,

Nili-Ahmadabadi,

Chun Kim

et al. 2024

Thermal Science and Engineering Progress

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Large-eddy simulations of the cavitation impact performance in reflux self-excited oscillating nozzles

Wang,

Fan,

Fang

et al. 2024

Physics of Fluids

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Existing research on reflux self-excited oscillating nozzles (RSONs) has primarily focused on flow drag reduction and combustion mixing, with relatively little investigation of their impact on cavitation. This study employs the large-eddy simulation framework to conduct numerical simulations of the three-dimensional cavitating jet generated by an RSON. We analyze the impact of vortex dissipation and the nozzle throat structure on the cavitation phenomena and the evolution of vortex structures. Further analysis examines the impact pressure, pulse frequency, cavitation phenomena, and distribution patterns of vortex structures in the flow field for RSONs and an organ pipe nozzle under inlet pressures of 7, 14, and 21 MPa. The results show that the dissipation of spanwise vortices is jointly determined by the shape of the nozzle outlet and the intensity of vortex structures, with nozzles featuring a reflux structure producing faster dissipation. The main frequency of jet pulsation initially increases and then decreases with the development of the jet. The impact pressure of the jet is closely related to the intensity of the cavitation cloud and the location of its collapse. The RSON with a throat structure produces the maximum impact pressure near the nozzle outlet. This study deepens our understanding of the RSON flow field characteristics and provides a scientific basis for RSON applications in a broad range of fields.

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Investigation on flow mechanism and impingement heat transfer performance of combined fluidic oscillators

Cited by 4 publications

References 26 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

Phosphor thermometry evaluation of heat transfer enhancement on a hot plate achieved by a vortex-based fluidic oscillator

Large-eddy simulations of the cavitation impact performance in reflux self-excited oscillating nozzles

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