On the Rayleigh-Taylor instability induced atomization

Dhivyaraja, K.; Jegan, M.; Vadivukkarasan, M.

doi:10.1016/j.ijmultiphaseflow.2021.103735

Cited by 4 publications

(2 citation statements)

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“…1999; Varga et al. 2003; Dhivyaraja, Jegan & Vadivukkarasan 2021). These images (or evidence), used to extract the relevant wavelength, have in common a small number (less than 10) of geometric features for the instability.…”

Section: Analytical Consideration Of the Dual-jet Atomization Mechanismmentioning

confidence: 99%

“…During the breakup process, the observation of the wavelength due to the Rayleigh-Taylor instability is a challenging task because multiple instabilities (including Kelvin-Helmholtz and Rayleigh-Plateau instabilities) may occur simultaneously. Researchers have analysed the unclear-looking (but consistent) pattern as reminiscent of Rayleigh-Taylor instability during the gas-assisted breakup of a single droplet, the coaxial jet, and the annular jet (Joseph et al 1999;Varga et al 2003;Dhivyaraja, Jegan & Vadivukkarasan 2021). These images (or evidence), used to extract the relevant wavelength, have in common a small number (less than 10) of geometric features for the instability.…”

Section: Bulk Atomizationmentioning

confidence: 99%

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Analysis of liquid column atomization by annular dual-nozzle gas jet flow

2022

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The atomization of a water column by a gas jet flow (Reynolds number $\sim O(10^{4}\unicode{x2013}10^{5})$ ) issued from a two-stage annular nozzle is investigated experimentally. Varying the nozzle geometry, the momentum flux ratio of the upper and lower jets, and the water flow rate, we measure the processes of atomization with high-speed imaging, analysed analytically into four regimes. In the bulk atomization regime, the atomization is driven by the lower jet, but it is forced to occur earlier by the stronger upper jet before the water column reaches the lower jet in the droplet atomization regime. Interestingly, the size of the atomized droplets remains unaffected by the momentum flux ratio of upper to lower jets. The atomization process is governed by the Rayleigh–Taylor instability, by which the estimated droplet size agrees well with the measurement. In the backflow regime, a strong reverse flow is induced to force a substantial portion of atomized droplets to be drawn backward to the nozzle; a floating liquid column regime is captured transitionally, i.e. the column stagnates near the lower nozzle when the water flow rate is very low. To understand the mechanisms of each regime, the single-phase jet flow is measured separately using particle image velocimetry, and implemented into the control volume analysis with which we predicted analytically and validated the conditions for the occurrence of each regime. It is found that the acceleration of gas flow (velocity gradient) experienced by the falling water is the key parameter to drive the atomization.

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Section: Analytical Consideration Of the Dual-jet Atomization Mechanismmentioning

confidence: 99%

Section: Bulk Atomizationmentioning

confidence: 99%