CAREER: Thixotropic Yield Stress Fluids - Splashing, Spreading, Sticking
职业:触变屈服应力流体 - 飞溅、铺展、粘附
基本信息
- 批准号:1351342
- 负责人:
- 金额:$ 40.64万
- 依托单位:
- 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:2014-05-01 至 2022-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
PI: Ewoldt, RandyProposal Number: 1351342The proposed CAREER project is focused on understanding the splashing of drops and jets of fluids that are rheologically complex, i.e., they behave differently than Newtonian fluids such as water. The goal of the PI is to design new fluid materials with desirable properties when the fluid impacts on a solid. Important applications of this research are fighting fires and manufacturing that involves coating technologies.Intellectual Merit:While yield stress fluids are non-Newtonian fluids with very useful functionalities, thixotropic, time-dependent yield stress fluids are still not systematically understood in the way that polymer melts and solutions are. The main objective of this proposal is to cover some of this white space by understanding the detailed phenomena that occur when droplets of thixotropic yield stress fluids impact on solids. An experimental study is proposed that will analyze droplet and jet impact experiments on dry and coated surfaces as a function of yield stress, flow viscosity, thixotropic timescales, and flow history using high-speed imaging and rheological characterization of complex thixotropic behavior. The goal is to use a deeper understanding of phenomena like splash regimes, spreading dynamics, and the material deposition pattern on the substrate, in order to meet design objectives for new fluid materials to fight fires and to develop novel manufacturing technologies. Broader Impacts:In addition to fundamental knowledge on the dynamics of complex fluids, understanding the process of splashing of thixotropic fluids can lead to practical applications with significant impact on society, for example in the manufacturing of coatings and on designing new materials to be used as additives in firefighting and fire prevention. The results can also have potential impacts to inkjet printing and agricultural spraying technologies.The educational aspect of the proposal includes educational activities that aim to engage students from the high school level and above. It is proposed to develop the "Rheology Zoo", a collection of learning modules that will be developed to connect human perception to rheological properties of fluid materials. The Rheology Zoo will target engineering undergraduates and graduate students, undergraduate Art+Design students, and high school students. The proposal here will establish The Zoo and build up the outreach pieces, starting at the home-campus of the PI, and work toward a sustainable and replicable outreach effort for other universities and geographical regions. This will occur through coursework, undergraduate honors credit, high school outreach, web videos, and do-it-yourself instructions for broad dissemination.
主要研究者:Ewoldt,Randy提案编号:1351342拟议的CAREER项目侧重于了解流体的液滴和射流的飞溅,这些流体在流变学上是复杂的,即,它们的行为不同于牛顿流体如水。PI的目标是设计新的流体材料,当流体冲击固体时具有所需的特性。这项研究的重要应用是灭火和涉及涂层技术的制造业。智力优势:虽然屈服应力流体是具有非常有用功能的非牛顿流体,但触变性、随时间变化的屈服应力流体仍然没有像聚合物熔体和溶液那样得到系统的理解。本提案的主要目的是通过了解触变屈服应力流体液滴撞击固体时发生的详细现象来覆盖该白色空间的一部分。提出了一个实验研究,将分析液滴和射流冲击实验干燥和涂层表面的屈服应力,流动粘度,触变时间尺度,和流动的历史,使用高速成像和流变特性的复杂触变行为的函数。 其目标是利用对飞溅机制、扩散动力学和基板上的材料沉积模式等现象的更深入理解,以满足新流体材料的设计目标,以扑灭火灾并开发新的制造技术。更广泛的影响:除了复杂流体动力学的基础知识,了解触变流体的飞溅过程可以导致对社会产生重大影响的实际应用,例如在涂料制造和设计新材料时用作消防和防火添加剂。 研究结果还可能对喷墨打印和农业喷洒技术产生潜在影响。该提案的教育方面包括旨在吸引高中以上学生的教育活动。建议开发“流变学动物园”,这是一系列学习模块,将开发这些模块以将人类感知与流体材料的流变特性联系起来。流变动物园将针对工程本科生和研究生,本科艺术+设计学生和高中生。这里的建议将建立动物园,并建立外展件,从PI的家庭校园开始,并努力为其他大学和地理区域的可持续和可复制的外展工作。这将通过课程作业,本科荣誉学分,高中外展,网络视频,并做自己的指示广泛传播。
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)
Thixotropic spectra and Ashby-style charts for thixotropy
触变光谱和 Ashby 式触变图表
- DOI:10.1122/8.0000446
- 发表时间:2022
- 期刊:
- 影响因子:3.3
- 作者:Sen, Samya;Ewoldt, Randy H.
- 通讯作者:Ewoldt, Randy H.
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Randy Ewoldt其他文献
Randy Ewoldt的其他文献
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{{ truncateString('Randy Ewoldt', 18)}}的其他基金
GOALI: Design of Rheologically-Complex Soft Materials
目标:复杂流变软材料的设计
- 批准号:
1463203 - 财政年份:2015
- 资助金额:
$ 40.64万 - 项目类别:
Standard Grant
BRIGE: Hagfish Defense Gel and the Rheology Zoo
BRIGE:盲鳗防御凝胶和流变动物园
- 批准号:
1342408 - 财政年份:2013
- 资助金额:
$ 40.64万 - 项目类别:
Standard Grant
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