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Atomization and Sprays
Editor-in-Chief Europe: Günter Brenn (open in a new tab)
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ISSN Печать: 1044-5110

ISSN Онлайн: 1936-2684

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INTERNAL FLOW PHYSICS OF A FLUIDIC OSCILLATOR SPRAY IN THE TRANSITION REGIME

Том 26, Выпуск 7, 2016, pp. 673-686
DOI: 10.1615/AtomizSpr.2015012652
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Краткое описание

An experimental investigation of the underlying flow physics of a dual-jet interaction fluidic oscillator spray has been conducted in the transition regime for a Reynolds number of 1680. The transition regime is defined as a narrow range of flow rates between two other operating modes of the fluidic oscillator. Particle image velocimetry (PIV) was used with refractive index−matching sodium iodide solution to minimize reflections from the spray geometry and obtain detailed internal velocity fields. PIV results show that the interaction of the two internal jets and the resultant vortices are responsible for the oscillation mechanism in the transition regime. Two side vortices sustain their existence throughout the oscillation period by altering their size, shape, and strength, and a dome vortex is created twice each oscillation period (once from each jet). The dome vortex plays a key role in the kinetic energy transfer mechanism inside the oscillator by means of jet bifurcations. The primary oscillation mechanism in the transition regime is that each internal jet's connection with the exiting jet is cut completely by the dome vortex in every period. This is in contrast to the low−flow rate oscillation mechanism, in which the oscillations are created by continuous collisions of the jets. Furthermore, the internal jets are observed to energize the side vortex on the opposite side of the chamber−a phenomenon that was not observed in the low−flow rate regime.

ЦИТИРОВАНО В
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  5. Tomac Mehmet N., de Luzan Charles Farbos, Synchronization of a Pair of Opposed Facing Oscillators in a Side-by-Side Configuration, International Journal of Heat and Fluid Flow, 84, 2020. Crossref

  6. TOMAC Mehmet, Effect of the Oscillator Length on the Characteristics of a Feedback Type Fluidic Oscillator, Academic Platform Journal of Engineering and Science, 2020. Crossref

  7. Tomac Mehmet N., Hossain Mohammad A., Flow and Frequency Characterization of the Synchronized Stacked Sweeping Jets, AIAA Journal, 59, 1, 2021. Crossref

  8. Wu Zhijun, Zhao Wenbo, Hu Zongjie, Xie Wei, Wang Yufeng, Li Liguang, Study on the Spray Characteristics and Oscillation Mechanism of a Feedback-Free Internal Impinging Nozzle, Flow, Turbulence and Combustion, 107, 4, 2021. Crossref

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  10. Hirata Katsuya, Inoue Tatsuya, Kondo Masaki, Tauchi Noriaki, Noguchi Takashi, On Predicting the Frequency of a Flip-Flop Jet Nozzle, Flow, Turbulence and Combustion, 109, 2, 2022. Crossref

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