Aerosol agitation: Quantifying the hydrodynamic stressors on particulates encapsulated in small droplets

McRae, Oliver; Mead, Kenneth R.; Bird, James

doi:10.1103/physrevfluids.6.l031601

Cited by 9 publications

(10 citation statements)

References 44 publications

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“…It has been found that bacterial growth at the oil-water interface alters the wettability by secretion of biosurfactants 50 , and thus our work may shed some light on the role of the microbial-enriched, structurally complex interface on droplet erupting from bursting bubbles as well as the subsequent airborne transmission modeling. Meanwhile, bursting bubbles are considered to produce sufficient mechanical stresses to be biologically relevant to organisms living in the sea-surface microlayer, including cell damage and vegetative reproduction at the microscale 9,51,52 . Our work suggests that the presence of an insoluble viscous layer may alter the mechanical stress and energy transport during jet formation, thus facilitating smaller jet droplet production.…”

Section: Discussionmentioning

confidence: 99%

Compound jetting from bubble bursting at an air-oil-water interface

Yang

Feng

2021

Nat Commun

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Bursting of bubbles at a liquid surface is ubiquitous in a wide range of physical, biological, and geological phenomena, as a key source of aerosol droplets for mass transport across the interface. However, how a structurally complex interface, widely present in nature, mediates the bursting process remains largely unknown. Here, we document the bubble-bursting jet dynamics at an oil-covered aqueous surface, which typifies the sea surface microlayer as well as an oil spill on the ocean. The jet tip radius and velocity are altered with even a thin oil layer, and oily aerosol droplets are produced. We provide evidence that the coupling of oil spreading and cavity collapse dynamics results in a multi-phase jet and the follow-up droplet size change. The oil spreading influences the effective viscous damping, and scaling laws are proposed to quantify the jetting dynamics. Our study not only advances the fundamental understanding of bubble bursting dynamics, but also may shed light on the airborne transmission of organic matters in nature related to aerosol production.

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Section: Discussionmentioning

confidence: 99%

Compound jetting from bubble bursting at an air-oil-water interface

Yang

Feng

2021

Nat Commun

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“…We speculate that the previous experimental observations may originate from the statistics of bacteria sampling and culturing of the jet drops. In these experiments, the average bacteria count in the top jet drop generated by such small bubbles is much less than 1, which may be inadequate for the purpose of sampling. , Additionally, the hydrodynamic stresses induced by jet breakup increase exponentially with decreasing jet drop (or bubble) radius . It is likely that a portion of the bacteria are killed during these experiments with such small bubbles, , preventing them from being cultured and thereby causing an underestimate in the original bacteria concentration in the jet drops.…”

Section: Particulate Enrichment In Top Jet Dropsmentioning

confidence: 98%

“…45,65 Additionally, the hydrodynamic stresses induced by jet breakup increase exponentially with decreasing jet drop (or bubble) radius. 66 It is likely that a portion of the bacteria are killed during these experiments with such small bubbles, 29,67 preventing them from being cultured and thereby causing an underestimate in the original bacteria concentration in the jet drops.…”

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confidence: 99%

Water-to-Air Transfer of Nano/Microsized Particulates: Enrichment Effect in Bubble Bursting Jet Drops

Singh

Feng

2022

Nano Lett.

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Bubbles dispersed in liquids are widely present in many natural and industrial processes and play a key role in mediating mass transfer during their lifetime from formation to rising to bursting. In particular, nano/microsized particulates and organisms present in the bulk water can be highly enriched in the jet drops ejected during bubble bursting, impacting global climate and public health. However, the detailed mechanism of this enrichment remains obscure with the enrichment factor being difficult to predict. Here, we experimentally investigate the enrichment of nano/microsized particles in bubble bursting jet drops and highlight the underlying hydrodynamic mechanism, combining the effects of bubble scavenge and bursting on the transport of particles. Scaling laws for the enrichment factor are subsequently proposed that describe both our and prior experimental results reasonably well. Our study may provide new insights for water-to-air transfer of bulk particulates such as microbes related to bubble bursting.

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“…Figure 1 (panels b–d) compares particle internal pressures to pressures encountered in high‐pressure chemistry, analytical chemistry, oceanography, and geology. Though aerosol internal pressure is too low to inactivate pathogens (Figure 1, panel c), capillary forces in the microscale could be important to bioaerosol viability (McRae et al., 2021). Pressures in particles 3–10 nm in diameter are close to those encountered in medium‐to high‐pressure synthetic organic chemistry, liquid chromatography, the ocean depths, and subsurface drilling.…”

Section: Theoretical Developmentmentioning

confidence: 99%

Constraints on the Role of Laplace Pressure in Multiphase Reactions and Viscosity of Organic Aerosols

Petters

2022

Geophysical Research Letters

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Aerosols have far-reaching impacts including adverse health effects, reduction in visibility, modification of clouds, and alteration of the Earth's climate. Aerosols affect climate by absorbing or scattering solar radiation, regulating condensation and evaporation of atmospheric trace gases including water, and affecting cloud properties by serving as cloud condensation nuclei (CCN). The substantial role of aerosols in the hydrological cycle is a significant source of uncertainty in climate projections (Forster et al., 2021).Nucleation and growth of new particles is the major contributor to both particle number and CCN-active particles in the atmosphere (H. Gordon et al., 2017;Kulmala et al., 2004;Pierce et al., 2011). The role of organic molecules in the nucleation mechanism is not precisely known . Nucleation occurs when a nascent molecular cluster achieves a diameter exceeding ∼0.7-1.7 nm and condensation of additional molecules becomes energetically favorable (Sipilä et al., 2010). New particle formation has been observed in various environments and occurs through different chemical pathways (Kerminen et al., 2018;Kulmala et al., 2004). Although nucleation is driven by the condensation of low-volatility inorganic species such as sulfuric acid, amines, iodic acid, and nitric acid (

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Aerosol agitation: Quantifying the hydrodynamic stressors on particulates encapsulated in small droplets

Cited by 9 publications

References 44 publications

Compound jetting from bubble bursting at an air-oil-water interface

Compound jetting from bubble bursting at an air-oil-water interface

Water-to-Air Transfer of Nano/Microsized Particulates: Enrichment Effect in Bubble Bursting Jet Drops

Constraints on the Role of Laplace Pressure in Multiphase Reactions and Viscosity of Organic Aerosols

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