Collaborative Research: Measurement of Particle Aggregation in Laboratory-scale Flows for Improved Models of Volcanic Ash Fallout and Entrainment
合作研究:测量实验室规模流动中的颗粒聚集,以改进火山灰沉降和夹带模型
基本信息
- 批准号:1756068
- 负责人:
- 金额:$ 27.62万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-03-15 至 2021-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Volcanic eruptions produce clouds of ash, which are hazardous to air travel and infrastructure. In emergencies, forecasters predict the transport of ash using numerical models, but they typically assume that particles fall as individuals to simplify the analysis. In reality, fine ash particles combine together into larger clusters, accelerating their rate of fall. This allows the ash to fall out of the cloud. Rates of aggregation depend on many factors, including moisture, electric charge, and turbulence. There is limited existing data on the effects of these properties, particularly for turbulent flows, even though aggregation affects up to 95% of fallout in some eruptions. Hence, there is a need for better experimental measurements of aggregation processes, along with more advanced models that include the phenomenon.This study aims to improve forecasting of volcanic hazards through both high-accuracy experiments and upgraded models. Ash aggregation will be examined in two different, relevant flow conditions: homogeneous turbulence and high-speed jets. High-resolution optical techniques will be used to study the flow, turbulence, and particle clustering. The results will be integrated into state-of-the-art analytical models, including some used for forecasting. Further, this research will be presented to the broader public through a series of hands-on demonstrations at the Oregon Museum of Science and Industry (OMSI).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
火山爆发会产生火山灰云,这对航空旅行和基础设施都是危险的。 在紧急情况下,预报员使用数值模型预测火山灰的传播,但他们通常假设颗粒作为个体落下,以简化分析。 实际上,细小的灰粒联合收割机会结合成更大的团,从而加速它们的下落速度。 这使得火山灰从云层中落下。 聚集的速率取决于许多因素,包括湿度、电荷和湍流。 有有限的现有数据的影响,这些属性,特别是湍流,即使聚合影响到95%的沉降物在一些爆发。 因此,有必要更好的实验测量的聚集过程,沿着更先进的模型,包括phenomenon.本研究的目的是通过高精度的实验和升级的模型,以提高火山灾害的预测。 灰聚集将在两个不同的,相关的流动条件:均匀湍流和高速射流检查。 高分辨率的光学技术将被用来研究流动,湍流和颗粒聚集。 其结果将纳入最先进的分析模型,包括用于预测的一些模型。 此外,这项研究将通过在俄勒冈州科学与工业博物馆(OMSI)的一系列实践演示向更广泛的公众展示。该奖项反映了NSF的法定使命,并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Isotropic turbulence apparatus with a large vertical extent
大垂直范围的各向同性湍流装置
- DOI:10.1007/s00348-021-03311-7
- 发表时间:2021
- 期刊:
- 影响因子:2.4
- 作者:Hoffman, Davis W.;Eaton, John K.
- 通讯作者:Eaton, John K.
Particle pair statistics of inertial particles at small separation using stereoscopic particle tracking
使用立体粒子跟踪对小间距惯性粒子进行粒子对统计
- DOI:10.18409/ispiv.v1i1.27
- 发表时间:2021
- 期刊:
- 影响因子:0
- 作者:Hoffman, Davis W.;Eaton, John K.
- 通讯作者:Eaton, John K.
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John Eaton其他文献
Deep Bleeder Acoustic Coagulation (DBAC)—part II: in vivo testing of a research prototype system
深放气声凝固 (DBAC) — 第二部分:研究原型系统的体内测试
- DOI:
- 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
Michael Sekins;S. R. Barnes;L. Fan;Jerry D. Hopple;S. Hsu;John Kook;Chi;C. Maleke;Xiaozheng Zeng;Romain Moreau;Alexis Ahiekpor;G. Funka;John Eaton;Keith Wong;S. Keneman;S. Mitchell;B. Dunmire;J. Kucewicz;F. Clubb;Matthew W. Miller;L. Crum - 通讯作者:
L. Crum
THU-324 Does steatotic liver disease influence treatment response and clinical outcomes in primary biliary cholangitis?
THU - 324脂肪性肝病是否会影响原发性胆汁性胆管炎的治疗反应和临床结局?
- DOI:
10.1016/s0168-8278(25)01004-9 - 发表时间:
2025-05-01 - 期刊:
- 影响因子:33.000
- 作者:
Ellina Lytvyak;Aldo J Montano-Loza;Bettina Hansen;Eugene Wong;Laurent Lam;Pierre-Antoine Soret;Sara Lemoinne;Gideon M. Hirschfield;Aliya Gulamhusein;Albert Pares;Ignasi Olivas;María Carlota Londoño;Sergio Rodriguez-Tajes;John Eaton;Karim T Osman;Christoph Schramm;Marcial Sebode;Ansgar Lohse;George Dalekos;Nikolaos Gatselis;Christophe Corpechot - 通讯作者:
Christophe Corpechot
OS078 - North American evaluation of 2519 patients with primary sclerosing cholangitis: longitudinal patterns of disease activity identify and validate stable and progressive phenotypes
OS078 - 北美对 2519 例原发性硬化性胆管炎患者的评估:疾病活动的纵向模式确定并验证稳定型和进展型表型
- DOI:
10.1016/s0168-8278(22)00525-6 - 发表时间:
2022-07-01 - 期刊:
- 影响因子:33.000
- 作者:
Marwa Ismail;John Eaton;Aliya Gulamhusein;Morven Cunningham;Christina Plagiannakos;Bettina Hansen;Gideon Hirschfield - 通讯作者:
Gideon Hirschfield
Methodologies for surveying plant communities in artificial channels
- DOI:
10.1023/a:1003881517387 - 发表时间:
1999-11-01 - 期刊:
- 影响因子:2.500
- 作者:
David Hatcher;John Eaton;Mary Gibson;Rick Leah - 通讯作者:
Rick Leah
Evaluation of Tofacitinib in Primary Sclerosing Cholangitis and Associated Colitis: A Multicenter, Retrospective Study
托法替布在原发性硬化性胆管炎及相关结肠炎中的评估:一项多中心、回顾性研究
- DOI:
10.1016/j.cgh.2023.01.014 - 发表时间:
2023-12-01 - 期刊:
- 影响因子:12.000
- 作者:
Ida Schregel;Guilherme P. Ramos;Stephanie Ioannou;Emma Culver;Martti Färkkilä;Christoph Schramm;John Eaton;Cynthia Levy;Olivier Chazouilleres;Tobias Müller;Jeremy Nayagam;Deepak Joshi;Ehud Zigmond;Oren Shibolet;Joost P.H. Drenth;Frank Hoentjen;Anja Geerts;Tobias J. Weismüller;Taotao Zhou - 通讯作者:
Taotao Zhou
John Eaton的其他文献
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{{ truncateString('John Eaton', 18)}}的其他基金
EAGER: Embedded Deep Neural Nets for Predicting Reynolds Stresses in Complex Flows
EAGER:用于预测复杂流中雷诺应力的嵌入式深度神经网络
- 批准号:
1940551 - 财政年份:2019
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
EAGER: Particle Concentration Measurements in Turbulent Flows using Magnetic Resonance Imaging
EAGER:使用磁共振成像测量湍流中的颗粒浓度
- 批准号:
1662422 - 财政年份:2017
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
SGER: Magnetic Resonance Velocimetry and Thermometry for Study of Complex Turbulent Flows
SGER:用于研究复杂湍流的磁共振测速和测温
- 批准号:
0432478 - 财政年份:2004
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
Dissertation Enhancement: Turbulence Modification in Particle-Laden Channel Flows
论文增强:充满颗粒的通道流中的湍流修改
- 批准号:
9908692 - 财政年份:1999
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
Attention of Gas Phase Turbulence by Dispersed Particles
分散粒子对气相湍流的关注
- 批准号:
9312496 - 财政年份:1994
- 资助金额:
$ 27.62万 - 项目类别:
Continuing Grant
Interactive Software for Self-Paced Instruction on Laboratory Instrumentation and Computerized Data Acquisition
用于实验室仪器和计算机数据采集自定进度教学的交互式软件
- 批准号:
9053617 - 财政年份:1991
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
The Interaction between Turbulence and Dispersed Particles in Fully Developed Channel Flow
充分发展的通道流中湍流与分散粒子之间的相互作用
- 批准号:
9005998 - 财政年份:1990
- 资助金额:
$ 27.62万 - 项目类别:
Continuing Grant
Small Grants for Exploratory Research: Rapid Heat Transfer Coefficient Measurement in a Computer Integrated Manufacturing Environment
用于探索性研究的小额资助:计算机集成制造环境中的快速传热系数测量
- 批准号:
9014814 - 财政年份:1990
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
Presidential Young Investigator Award: Experimental Fluid Mechanics
总统青年研究员奖:实验流体力学
- 批准号:
8351417 - 财政年份:1984
- 资助金额:
$ 27.62万 - 项目类别:
Continuing Grant
Central Computer For an Integrated Laboratory Computer System
集成实验室计算机系统的中央计算机
- 批准号:
8104740 - 财政年份:1982
- 资助金额:
$ 27.62万 - 项目类别:
Standard Grant
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