Prediction of the droplet size distribution in aerodynamic droplet breakup

Jackiw, Isaac M.

doi:10.1017/jfm.2022.249

Cited by 28 publications

(141 citation statements)

References 54 publications

(303 reference statements)

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“…Additionally, the number mean diameter is a required input parameter for this distribution. Jackiw & Ashgriz (2022) developed an analytical model to predict the combined multi-modal distribution, accounting for various mechanisms, for the aerodynamic breakup of droplets in a no-swirl condition.…”

Section: Resultsmentioning

confidence: 99%

“…In the present study, for swirl airstreams, we have followed a similar approach as that of Jackiw & Ashgriz (2022) by considering the volume-weighted probability density function, , instead of the number-weighted probability density function, , as the distribution based on is more biased towards the smaller size droplets. The volume-weighted density refers to the ratio of the total volume of droplets of a specific diameter to the total volume of all droplets.…”

Section: Resultsmentioning

confidence: 99%

“…there is no undeformed core). The ratio indicates the volume fraction of the nodes relative to the disk, which is approximately as considered by Jackiw & Ashgriz (2022).…”

Section: Resultsmentioning

confidence: 99%

“…2022; Xu, Wang & Che 2022), there have been very few studies on the size distribution of satellite droplets after fragmentation of a large droplet (Srivastava 1971; Villermaux & Bossa 2009; Gao et al. 2022; Jackiw & Ashgriz 2022). Moreover, to our knowledge, no one has previously investigated the droplet size distribution under swirl airstream, even though such a situation is frequently encountered during rainfall (Lewellen, Lewellen & Xia 2000; Haan et al.…”

Section: Introductionmentioning

confidence: 99%

“…(2017). Although Jackiw & Ashgriz (2022) performed fragmentation experiments for a water droplet under straight airflow without swirling using a shadowgraphy technique, they only analysed the size distributions of satellite ethanol droplets reported by Guildenbecher et al. (2017) using a digital in-line holography technique.…”

Section: Introductionmentioning

confidence: 99%

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Droplet size distribution in a swirl airstream using in-line holography technique

Ade

Kirar²,

Chandrala³

et al. 2023

J. Fluid Mech.

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We investigate the morphology and size distribution of satellite droplets resulting from the interaction of a freely falling water droplet with a swirling airstream of different strengths by employing shadowgraphy and deep-learning-based digital in-line holography techniques. We found that the droplet exhibits vibrational, retracting bag and normal breakup phenomena for the no swirl, low and high swirl strengths for the same aerodynamic field. In the high-swirl scenario, the disintegrations of the nodes, rim and bag-film contribute to the number mean diameter, resulting in smaller satellite droplets. In contrast, in the low-swirl case, the breakup of the rim and nodes only contributes to the size distribution, resulting in larger droplets. The temporal variation of the Sauter mean diameter reveals that for a given aerodynamic force, a high swirl strength produces more surface area and surface energy than a low swirl strength. The theoretical prediction of the number-mean probability density of tiny satellite droplets under swirl conditions agrees with experimental data. However, for the low swirl, the predictions differ from the experimental results, particularly due to the presence of large satellite droplets. Our results reveal that the volume-weighted droplet size distribution exhibits two (bi-modal) and three (multi-model) peaks for low and high swirl strengths, respectively. The analytical model that takes into account various mechanisms, such as the nodes, rim and bag breakups, accurately predicts the shape and characteristic sizes of each mode for the case of high swirl strength.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…there is no undeformed core). The ratio indicates the volume fraction of the nodes relative to the disk, which is approximately as considered by Jackiw & Ashgriz (2022).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Droplet size distribution in a swirl airstream using in-line holography technique

Ade

Kirar²,

Chandrala³

et al. 2023

J. Fluid Mech.

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Aerodynamic breakup of emulsion droplets in airflow

Xu,

Liu,

Zhang

et al. 2024

Droplet

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Aerodynamic breakup refers to the process where large droplets are fragmented into small droplets by the aerodynamic force in airflow, which plays a vital role in fluid atomization and spray applications. Previous research has primarily concentrated on the aerodynamic breakup of single‐component droplets, but investigations into the breakup of emulsion droplets are limited. This study experimentally investigated the aerodynamic breakup of water‐in‐oil emulsions in airflow, utilizing high‐speed photography to observe the breakup process and digital in‐line holography to measure fragment sizes. Comparative analyses between emulsion droplets and single‐component droplets are conducted to examine the breakup morphology, breakup regime, deformation characteristics, and fragment size distributions. The emulsion droplets exhibit higher apparent viscosity and shorter stretching lengths of the bag film and peripheral rim due to the presence of a dispersed phase. The breakup regime transitions of emulsions are modeled by integrating the viscosity model of emulsions and the transition model of the pure fluid. The fragment sizes of emulsion droplets are larger due to the shorter lengths of the bag film and peripheral rim.

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