Temporal Instability of Liquid Jet in Swirling Gas with Axial Velocity Oscillation

The temporal instability of a confined viscous liquid jet surrounded by high speed co-flowing viscous gas phase is studied in this work. The effect of the longitudinal acoustic oscillations, which is regarded as gas axial velocity oscillations, is also considered. The heat and mass transfer is characterized by the ratio between conduction heat flux and the evaporation heat flux, then an explicit dispersion relation equation is obtained. The results suggest that more than one unstable region appears because of the gas velocity oscillations, including Kelvin-Helmholtz (K-H) instability and parametric instability regions. Increasing the forcing frequency enhances the K-H instability, while it has a stabilizing effect on the parametric instability. In addition, the liquid jet tends to be more unstable in non-axisymmetric modes when the gas rotating strength is strong. Although the gas viscosity has a destabilizing effect on the gas-liquid interface, the destabilizing effect is weak due to the low viscosity of gas phase. According to the linear instability theory, the dominant wavenumber will locate in the most unstable region. Moreover, the parametric instability in non-axisymmetric modes may be observable when the Weber number is large.

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Unrelaxed tensile stress impacts on the instability of viscoelastic sheets with the gas velocity oscillation

Liu

Yao

Dong

et al. 2023

Physics of Fluids

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A temporal instability analysis of a viscoelastic liquid sheet with unrelaxed tensile stresses in the oscillation gaseous flow field has been studied with the Floquet method in the present research. Effects of the oscillated amplitude and frequency of incoming gaseous flow on the instability features in the different instability regions are analyzed systematically. Results reveal that the unrelaxed tensile stress has a positive effect on stabilizing the liquid sheet, while the higher oscillation amplitude would promote the sheet breakup. Besides, it is indicated that when the stress tensor would be controlled by the viscoelastic effects, elastic impacts would suppress the breakup, while it shows an opposite impact when the stress tensor is dominated by the tensile stress. The existence of parametric instability regions is influenced by the oscillated and elastic parameters as well.

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Temporal Instability of Liquid Jet in Swirling Gas with Axial Velocity Oscillation

Cited by 6 publications

References 26 publications

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Experimental study on effects of ammonia enrichment on the thermoacoustic instability of lean premixed swirling methane flames

Temporal instability of confined three-dimensional liquid jet with heat and mass transfer under longitudinal acoustic oscillations

Unrelaxed tensile stress impacts on the instability of viscoelastic sheets with the gas velocity oscillation

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