CAREER: Transport properties and morphology associated with bursting-bubble induced jetting phenomena

职业：与气泡破裂引起的喷射现象相关的传输特性和形态

• 批准号: 1351466
• 负责人: James Bird
• 金额: $ 41.54万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-02-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1351466&HistoricalAwards=false
• 关键词: CAREER; Transport; properties; morphology; associated

PI: Bird, JamesProposal Number: 1351466The proposed CAREER project is focused on understanding the physic al mechanism of the generation of aerosol droplets as bubbles burst. Understanding the physics behind submicron aerosol formation is important in a host of engineering applications ranging from turbine corrosion to the dispersion of respiratory deceases, since their residence time in the atmosphere can be on the order of weeks. Intellectual Merit:When a bubble bursts, a set of droplets is formed and these droplets break into other smaller droplets, the larger of which break up further creating a hierarchy of droplet sizes. Ultimately, submicron aerosol droplets are formed that are not predicted with current fluid dynamic models, since the primary physical mechanism responsible for their formation is unknown. The goal of this proposal is to explore three concepts on how jet drops from small bursting bubbles may account for observed submicron aerosols. One concept is that the empirical formulas that relate the size of millimeter bubbles to the size of jet drops that they produce may not be valid for micron-scale bubbles. Another concept is that satellite and sub-satellite droplets may develop when larger droplets are produced, and that these smaller droplets may account for the unexplained submicron aerosols. The final concept is that larger bubble-induced jets may couple with smaller jet drops or satellite drops and propel the smaller drops beyond the viscous sublayer. The PI will explore and evaluate these ideas using direct highspeed observations, numerical simulations, and appropriately dimensionalized experimental models.Broader Impacts:Results from the proposed work can find important applications with significant economic and societal impact, for example avoiding corrosion due to salt aerosols in sensors and engines operating in marine environments. Other applications on a local scale include modeling the airborne flux of aerosolized pathogens, such as bevotoxins from red tides to make better public policy decisions, such as which beaches to close. On a global scale, a better understanding of aerosol production is necessary to reduce uncertainty in global climate models, and will allow policy makers to better assess the risks and rewards of geoengineering mitigation strategies, such as deliberately injecting large amounts of sulfur particulates in to the atmosphere in hopes to counter the warming effects of greenhouse gases.The proposal also includes outreach and education activities that are complementary to the research project. It is proposed to develop workshops for pre-service Early Childhood Education teachers and intensive laboratory immersion experiences for seasoned in-service elementary and preschool teachers. Finally, the proposal includes a partnership with the Boston Museum of Science to develop new science modules that aim to increase scientific engagement between children and their parents.

主要研究者：Bird，James提案编号：1351466拟议的CAREER项目的重点是了解气泡破裂时产生气溶胶液滴的物理机制。 了解亚微米气溶胶形成背后的物理学在从涡轮机腐蚀到呼吸道疾病的扩散的许多工程应用中是重要的，因为它们在大气中的停留时间可以是数周。 智力优点：当气泡破裂时，形成一组液滴，这些液滴破裂成其他较小的液滴，较大的液滴进一步破裂，形成液滴大小的层次结构。最终，亚微米气溶胶液滴的形成是目前的流体动力学模型无法预测的，因为其形成的主要物理机制是未知的。 该提案的目标是探索三个概念，即小气泡破裂产生的喷射液滴如何解释观察到的亚微米气溶胶。一个概念是，将毫米级气泡的大小与它们产生的喷射液滴的大小相关联的经验公式可能对微米级气泡无效。另一个概念是，当较大的液滴产生时，可能会形成卫星和亚卫星液滴，这些较小的液滴可能是无法解释的亚微米气溶胶的原因。最后的概念是，较大的气泡诱导射流可能与较小的射流液滴或卫星液滴耦合，并推动较小的液滴超出粘性子层。PI将通过直接高速观测、数值模拟和适当维度的实验模型来探索和评估这些想法。更广泛的影响：拟议工作的结果可以找到具有重大经济和社会影响的重要应用，例如避免在海洋环境中运行的传感器和发动机中因盐气溶胶而受到腐蚀。在地方范围内的其他应用包括模拟气溶胶病原体的空气传播通量，例如来自赤潮的贝伏毒素，以制定更好的公共政策决策，例如关闭哪些海滩。在全球范围内，有必要更好地了解气溶胶的产生，以减少全球气候模型的不确定性，并使决策者能够更好地评估地球工程减缓战略的风险和回报，例如故意向大气中注入大量的硫颗粒，希望以此来对抗温室气体的变暖效应。该提案还包括与之相辅相成的推广和教育活动研究项目。建议为在职幼儿教育教师举办讲习班，为经验丰富的在职小学和幼儿教师举办强化实验室沉浸体验。最后，该提案还包括与波士顿科学博物馆合作开发新的科学模块，旨在增加儿童与父母之间的科学参与。

项目成果

Enriching particles on a bubble through drainage: Measuring and modeling the concentration of microbial particles in a bubble film at rupture

通过排水富集气泡上的颗粒：测量和模拟破裂时气泡膜中微生物颗粒的浓度

• DOI: 10.1525/elementa.230
• 发表时间: 2017
• 期刊: Elem Sci Anth
• 作者: Walls, Peter L.;Bird, James C.
• 通讯作者: Bird, James C.

A new wrinkle on liquid sheets: Turning the mechanism of viscous bubble collapse upside down

• DOI: 10.1126/science.aba0593
• 发表时间: 2020-08-07
• 期刊: SCIENCE
• 影响因子: 56.9
• 作者: Oratis, Alexandros T.;Bush, John W. M.;Bird, James C.
• 通讯作者: Bird, James C.

Periodic jetting and monodisperse jet drops from oblique gas injection

倾斜气体注入产生的周期性喷射和单分散射流滴

• DOI: 10.1103/physreve.96.013112
• 发表时间: 2017
• 期刊: Physical Review E
• 影响因子: 2.4
• 作者: McRae, Oliver;Gaillard, Antoine;Bird, James C.
• 通讯作者: Bird, James C.

Minimum size for the top jet drop from a bursting bubble

• DOI: 10.1103/physrevfluids.3.074001
• 发表时间: 2018-07-11
• 期刊: PHYSICAL REVIEW FLUIDS
• 影响因子: 2.7
• 作者: Brasz, C. Frederik;Bartlett, Casey T.;Bird, James C.
• 通讯作者: Bird, James C.

Jet drops from bursting bubbles: How gravity and viscosity couple to inhibit droplet production

• DOI: 10.1103/physreve.92.021002
• 发表时间: 2015-08-17
• 期刊: PHYSICAL REVIEW E
• 影响因子: 2.4
• 作者: Walls, Peter L. L.;Henaux, Louis;Bird, James C.
• 通讯作者: Bird, James C.