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• W4324375425 abstract "Abstract In this study, the coherent structure dynamics and entrainment capability of elliptical jets emitted from an elliptical nozzle with aspect ratio ( AR ) values of 1 (i.e., a circular jet), 2, and 4 at a fixed Reynolds number of 3,000 were experimentally characterized by flow reconstruction using tomographic particle image velocimetry and modal decomposition using the spectral proper orthogonal decomposition method. Statistical analysis indicated that the elliptical synthetic jet had a greater entrainment rate and momentum flux than the circular jet. The temporal dynamics of the coherent structure showed that all the jets emitted from the elliptical nozzle at AR = 1 (i.e., a circular jet), 2, and 4 had a dominant frequency at Strouhal number ( St ) = 0.39, representing the leading Kelvin–Helmholtz (K-H) vortex ring in each jet. The frequency of the trailing vortex was also at St = 0.39 at AR = 1 and 2, whereas that at AR = 4 was at St = 0.70. It was found that vortex ring pairing and merging, as well as axis switching, are common in elliptical jets. When AR was 4, there was also a large-scale single vortex ring between the two merged vortex rings, this large-scale single vortex alone underwent axis transformation and breakage. The merger always occurred in the major plane in elliptical jets because in the major plane, the leading and trailing vortices approached each other as a result of self-induction and mutual induction. The entrainment rate was strongly correlated with the K-H vortex ring dynamics in circular jets and weakly correlated with the K–H vortex ring passing in elliptical jets. The entrainment appeared in the upstream part of the K-H vortex ring structures in circular jets, whereas it was enhanced in the axis-switching region in elliptical jets. An analysis of the contribution of each mode to mass entrainment showed that the entrainment rate of the elliptical nozzle was better than that of the circular nozzle, mainly because many streamwise vortices were generated." @default.
• W4324375425 created "2023-03-16" @default.
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• W4324375425 date "2023-03-15" @default.
• W4324375425 modified "2023-10-16" @default.
• W4324375425 title "Dynamics and Entrainment Mechanism of the Jet Flows from an Elliptical Nozzle: Time-Resolved Tomographic PIV Measurements" @default.
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• W4324375425 doi "https://doi.org/10.21203/rs.3.rs-2674208/v1" @default.
• W4324375425 hasPublicationYear "2023" @default.
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