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.

PI：Bird，James Propopals编号：1351466拟议的职业项目的重点是了解随着气泡破裂而产生气溶胶液滴的物理机制。 在许多工程应用中，了解从涡轮腐蚀到呼吸道分散的许多工程应用，了解亚微米气溶胶形成背后的物理学很重要，因为它们在大气中的停留时间可以在数周的时间内。 智力优点：当气泡爆发时，形成了一组液滴，这些液滴闯入其他较小的液滴中，较大的液滴进一步分解，形成了液滴尺寸的层次结构。最终，由于目前的流体动态模型未预测的亚微米气溶胶液滴，因为导致其形成的主要物理机制尚不清楚。 该提案的目的是探讨三个概念，说明如何从小型爆发气泡中滴下来，可能是观察到的亚微米气溶胶。一个概念是，将毫米气泡的大小与它们产生的喷气液尺寸相关的经验公式可能无效。另一个概念是，当产生较大的液滴时，卫星和亚卫星液滴可能会发展出来，并且这些较小的液滴可能解释了无法解释的亚微音气溶胶。最终的概念是，较大的气泡引起的喷气机可能会与较小的喷射液或卫星滴相结合，并推动较小的滴剂超出粘性的子层。 PI将使用直接高速观测，数值模拟和适当维度化的实验模型探索和评估这些想法。Broader的影响：拟议工作的结果可以找到重要的应用程序，例如，在海洋环境中，在传感器和发动机中，避免在盐气溶胶中造成巨大的经济和社会影响，例如避免腐蚀。当地规模上的其他应用程序包括对气溶的病原体的空气传播通量进行建模，例如红潮中的bevotoxins来做出更好的公共政策决策，例如要关闭哪些海滩。在全球范围内，必须更好地理解气溶胶生产是减少全球气候模型中不确定性的必要条件，并且将使政策制定者能够更好地评估地球工程缓解策略的风险和回报，例如故意将大量的硫磺颗粒物中的大量硫磺颗粒注入大气中，希望对待遇的态度进行培养。有人建议开展讲习班，以供工作前的幼儿教育老师以及为经验丰富的服务中的小学和学龄前教师的强化实验室沉浸体验。最后，该提案包括与波士顿科学博物馆建立合作伙伴关系，以开发新的科学模块，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.