Flow Separation and Turbulence in Jet Pumps for Thermoacoustic Applications

Oosterhuis, Joris; Verbeek, Antonie Alex; Bühler, Simon; Wilcox, D.; Meer, Theodorus H. van der

doi:10.1007/s10494-016-9731-8

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…Specifically, turbulent flows identified by the criteria in [92] can lead to a reduction in the flow separation in the diverging part of the jet pump, and this can therefore boost performance. The experimental results in the laminar regime were also compared with previous numerical results [91].…”

Section: Minor Lossesmentioning

confidence: 98%

“…In subsequent work, Timmer et al [90] showed the crucial role of flow separation in the jet pump performance by varying the geometry of the jet pump, pointing out the decrease in the pressure drop available to contrast the Gedeon streaming and the opposite increase in acoustic power dissipation. Oosterhuis et al [91] ran some experiments to investigate the influence of turbulence on the jet pump performance. Specifically, turbulent flows identified by the criteria in [92] can lead to a reduction in the flow separation in the diverging part of the jet pump, and this can therefore boost performance.…”

Section: Minor Lossesmentioning

confidence: 99%

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CFD Modeling of Thermoacoustic Energy Conversion: A Review

Meglio

Massarotti

2022

Energies

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In this article, a comprehensive review of the computational fluid dynamics (CFD)-based modeling approach for thermoacoustic energy conversion devices is proposed. Although thermoacoustic phenomena were discovered two centuries ago, only in recent decades have such thermoacoustic devices been spreading for energy conversion. The limited understanding of thermoacoustic nonlinearities is one of the reasons limiting their diffusion. CFD is a powerful tool that allows taking into consideration all the nonlinear phenomena neglected by linear theory, on which standard designs are based, to develop energy devices that are increasingly efficient. Starting from a description of all possible numerical models to highlight the difference from a full CFD method, the nonlinearities (dynamic, fluid dynamic and acoustic) are discussed from a physical and modeling point of view. The articles found in the literature were analyzed according to their setup, with either a single thermoacoustic core (TAC) or a full device. With regard to the full devices, a further distinction was made between those models solved at the microscopic scale and those involving a macroscopic porous media approach to model the thermoacoustic core. This review shows that there is no nonlinear porous media model that can be applied to the stack, regenerator and heat exchangers of all thermoacoustic devices in oscillating flows for each frequency, and that the eventual choice of turbulence model requires further studies.

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Section: Minor Lossesmentioning

confidence: 98%