Breakup of swirling films issued from a pressure-swirl atomizer

Bang, Boo-Hyoung; Ahn, Chang-Soo; Yoon, Sam S.; Yarin, Alexander L.

doi:10.1016/j.fuel.2022.125847

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…This will undoubtedly involve adjustment of perturbation characteristics, accounting for the disturbance levels present in the liquid sheet; however, the approach could remain unchanged (cf. Bang et al 2023).…”

Section: Discussionmentioning

confidence: 99%

“…those originating from swirl atomizers, as in Bang et al. 2023). Furthermore, the requirement of zero capillary pressure in liquid in equilibrium with the surrounding vacuum is arbitrary.…”

Section: Mechanism Of the Film Disintegration By Hole Nucleation And ...mentioning

confidence: 99%

“…(2023), where similar arguments related to hole formation on swirling liquid films issued from pressure-swirl atomizers were considered, was neglected compared to , which leads to an equation for the cross-sectional radius without the term in the denominator instead of (4.1), and the related changes in the equations of Bang et al. (2023) corresponding to (4.2)–(4.6) here. It should be emphasized that the present refined version of (4.1)–(4.6) is preferable.…”

Section: Mechanism Of the Film Disintegration By Hole Nucleation And ...mentioning

confidence: 99%

“…However, this approach neglects the formation of a free rim, which could be realized in the Taylor & Michael (1973) apparatus with suspended soap films, but is inapplicable to hole formation in dynamic free liquid films originating from drop impacts onto pre-existing liquid films (or many other films, e.g. those originating from swirl atomizers, as in Bang et al 2023). Furthermore, the requirement of zero capillary pressure in liquid in equilibrium with the surrounding vacuum is arbitrary.…”

Section: Spontaneously Growing Holes In Liquid Filmsmentioning

confidence: 99%

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Drop impact onto a substrate wetted by another liquid: corona detachment from the wall film

et al. 2023

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Drop impact onto a thin liquid film of another liquid is observed and characterized using a high-speed video system. A new mode of splash – a complete, simultaneous corona detachment – has been observed, which is the result of the lamella breakup near the wall film. The abrupt outward and upward displacement of the lamella leads to an extreme stretching of the corona wall, resulting in its rapid thinning and a rupture. This rupture triggers propagating Taylor–Culick rims, which rapidly spread, meet and, thus, undercut simultaneously the entire corona, resulting in its detachment. Special experiments with the spreading corona impingement onto a fixed needle, supplement the physical evidence of the above-mentioned mechanism. A self-consistent theory of the observed phenomena is proposed and compared with experiments, exhibiting good agreement.

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Section: Discussionmentioning

confidence: 99%

“…those originating from swirl atomizers, as in Bang et al. 2023). Furthermore, the requirement of zero capillary pressure in liquid in equilibrium with the surrounding vacuum is arbitrary.…”

Section: Mechanism Of the Film Disintegration By Hole Nucleation And ...mentioning

confidence: 99%

Section: Mechanism Of the Film Disintegration By Hole Nucleation And ...mentioning

confidence: 99%

Section: Spontaneously Growing Holes In Liquid Filmsmentioning

confidence: 99%

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Drop impact onto a substrate wetted by another liquid: corona detachment from the wall film

et al. 2023

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“…The surface waves of the liquid film are overwhelmed, and holes are generated on the surface (Figure 8c,d red pane). The growing holes are surrounded by the loop-like cylindrical free rims propagating according to the Taylor-Culick mechanism [25], causing the liquid film to bend towards the axial position (Figure 8c). At this point, due to the pressure imbalance inside and outside the liquid film, the gas flows downstream along the outer surface of the liquid, detaching droplets from the edge of the hole (Figure 8d).…”

Section: Liquid Film Breakup Morphologymentioning

confidence: 99%

Experimental Study on Atomization Characteristics of Swirl Nozzle under Annular Airflow Impingement

Han,

Zhang,

Liu

et al. 2024

Fluids

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Pressure nozzles are widely used in spray drying and other industries. In order to improve the atomization characteristics of pressure cyclone nozzles, a new type of annular jet gas impingement atomization device is developed. We use high-speed imaging and digital image processing and other methods to analyze the spray characteristics of the different annular device configurations (using four, six, and eight tubes) and under different gas–liquid mass flow rates. It is shown that with an increase in the Air–Liquid mass Ratio (ALR), the liquid film breakup process changes from undulating sheet breakup to perforated sheet breakup and the breakup length decreases. The breakup length decreases the most under the condition of six-tube airflow with the range of 31–55%, while the Sauter mean diameter (SMD) basically does not change. With the increase in ALR and the Weber number of liquid (Wel), the droplet size distribution becomes more uniform. The spray characteristics of the atomizer assisted by gas jets reaches the best state when Wel = 4596.3 and m˙g = 1.97 g/s. The experimental conclusions have some guiding significance for the design and optimization of the atomization devices in spray drying towers.

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Droplet size from Venturi air induction spray nozzles

2023

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Sprays are of great importance for many applications, with drop size being a crucial parameter. Especially in agriculture applications, simple flat fan spray nozzles are often supplemented by a Venturi component to achieve larger drop sizes and hence, prevent unwanted spray drift of the smallest droplets. The general believe is that these larger drops are usually attributed to the fact that the liquid sheet produced by the nozzle breaks up more easily due to the pre-existing ’holes’ formed by the induced air bubbles. Here, we extend descriptions of how nozzle and fluid parameters determine droplet size distributions from Venturi nozzles. We show that the mean droplet size is determined by the nozzle’s orifice area as is the case for ordinary flat fan nozzles, but that the additional pressure drop over the Venturi chamber needs to be taken into account. Using this parameter, relations that were derived for flat fan nozzles can be re-used. This allows to show that the increase in droplet size compared to conventional nozzles is due to the additional pressure drop in the Venturi chamber, and not to a change in breakup mechanism due to the presence of air bubbles in the liquid sheet.

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Breakup of swirling films issued from a pressure-swirl atomizer

Cited by 9 publications

References 43 publications

Drop impact onto a substrate wetted by another liquid: corona detachment from the wall film

Drop impact onto a substrate wetted by another liquid: corona detachment from the wall film

Experimental Study on Atomization Characteristics of Swirl Nozzle under Annular Airflow Impingement

Droplet size from Venturi air induction spray nozzles

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