Droplet breakup regimes and criteria for their existence

Борисов, А. А.; Gel’fand, B. E.; Natanzon, M. S.; Kossov, O. M.

doi:10.1007/bf00825066

Cited by 36 publications

(2 citation statements)

References 11 publications

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“…The secondary break‐up was not considered due to the low Weber number of the droplets 24 (maximum of 1.5). The effects of Brownian motion were also not included.…”

Section: Methodsmentioning

confidence: 99%

Modeling the effect of temperature and relative humidity on exposure to SARS‐CoV ‐2 in a mechanically ventilated room

et al. 2022

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Computational fluid dynamics models have been developed to predict airborne exposure to the SARS‐CoV‐2 virus from a coughing person in a mechanically ventilated room. The models were run with three typical indoor air temperatures and relative humidities (RH). Quantile regression was used to indicate whether these have a statistically significant effect on the airborne exposure. Results suggest that evaporation is an important effect. Evaporation leads to respiratory particles, particularly those with initial diameters between 20 and 100 μm, remaining airborne for longer, traveling extended distances and carrying more viruses than expected from their final diameter. In a mechanically ventilated room, with all of the associated complex air movement and turbulence, increasing the RH may result in reduced airborne exposure. However, this effect may be so small that other factors, such as a small change in proximity to the infected person, could rapidly counter the effect. The effect of temperature on the exposure was more complex, with both positive and negative correlations. Therefore, within the range of conditions studied here, there is no clear guidance on how the temperature should be controlled to reduce exposure. The results highlight the importance of ventilation, face coverings and maintaining social distancing for reducing exposure.

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“…The secondary break‐up was not considered due to the low Weber number of the droplets 24 (maximum of 1.5). The effects of Brownian motion were also not included.…”

Section: Methodsmentioning

confidence: 99%

Modeling the effect of temperature and relative humidity on exposure to SARS‐CoV ‐2 in a mechanically ventilated room

et al. 2022

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“…In Adiga et al, 11 it was shown that these shock wave blast-impacted bigger droplets produced a cloud of fine mist due to the shock energy absorption owing to the discontinuity in the thermophysical properties across the normal shock (Chauvin et al 12 ). The mist region (Borisov et al 13 ) exhibits significantly small new droplets formed from the parent droplet at very high relative velocities where “secondary” droplet disintegration is associated with many droplet breakup modes providing variation in drop size distribution (Gelfand et al 14 ).…”

Section: Introductionmentioning

confidence: 99%

Atomization characteristics of a bluff body-assisted sonic twin-fluid atomizer

Sikka

Vågsæther

Bjerketvedt

et al. 2022

International Journal of Spray and Combustion Dynamics

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This study examines the gas dynamic effect and atomization behaviour of the sonic bluff body-assisted twin-fluid atomizer with three distinct geometry configurations based on cone distances (Lc) as 6.0 mm, 8.0 mm, and 10.0 mm. The atomization characteristics of these atomizers employing a 280 µm annular liquid sheet with a central bluff body (cone) are compared based on a range of air and liquid flow rates. The spray-bluff body impacted secondary atomization was characterized through volume-normalized droplet size distribution (DSD) & cumulative droplet distribution, excentricity plots, Sauter mean diameter (SMD), and relative span factor (Δ). When plotted for a given liquid flow rate, the DSD & cumulative droplet distribution becomes more uniform with the increase in the airflow rate independent of the cone distance (Lc). Excentricity plots exhibited high excentricity droplets at the spray centreline and a large fraction of nearly spherical droplets at off-centre spray locations. SMD and RSF (Δ) showed opposite trends when plotted against the air-to-liquid ratio (ALR) as SMD increases while RSF decreases with radial locations, respectively. When plotted for all radial locations, Sauter mean diameter (D32) and relative span factor (Δ) show a cluster formation. Larger SMD values correspond to lower RSF (Δ) values and vice-versa.

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