Particle Image Baro-Velocimetry (PIBV): simultaneous measurement of pressure and velocity in fluids

粒子图像气压测速 (PIBV)：同时测量流体中的压力和速度

• 批准号: 1332204
• 负责人: Maurizio Porfiri
• 金额: $ 27万
• 依托单位: New York University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1332204&HistoricalAwards=false
• 关键词: Particle; Image; Baro; Velocimetry; PIBV

Porfiri, Maurizio 1332204 This proposal addresses the grand challenge of enabling, for the first time, direct and simultaneous full-field measurement of the instantaneous pressure and velocity in a fluid flow. The proposed methodology will transform current experimental fluid mechanics practices by providing US academic, industrial, and government institutions with the capability of performing local sensing in real time of kinematics and kinetics of fluid flow fields. While the proposed framework is transformative in nature, its practical implementation requires minimal upgrades to established fluid mechanics measurement systems. Specifically, this proposal encompasses the formulation and incorporation of novel pressure-sensitive tracer particles into traditional Particle Image Velocimetry (PIV) systems towards a novel Particle Image Baro-Velocimetry (PIBV) system. The proposed microcapsules will comprise air encapsulated in highly compliant biocompatible hydrogel shells that are specifically formulated to fluoresce with different wavelength distributions, that is, to change color, depending on the strain of the hydrogel shell. Pressure acting upon the particle modifies its volume, which, in turn, results in a measurable change in the fluorescent response. The response time of the probes to a step change in pressure is expected to be on the order of a microsecond. Further, the hydrogel microprobe design can be tailored to the experiment to optimize sensitivity over a prescribed pressure range and detect pressure levels as low as the order of ten pascals. Utilizing these novel microscale particles as tracers, the velocity field within a fluid can be measured using traditional PIV techniques without a loss of flow tracing fidelity or an increase in overall measurement uncertainty.Intellectual Merit :The intellectual merits of this project include: (i) establishing a novel measurement system that will enable full characterization of the pressure and velocity fields of complex fluid flow scenarios; (ii) designing, synthesizing, and calibrating a new class of biocompatible pressure microprobes based on hydrogels; (iii) formulating and experimentally validating mechanics-based theoretical and computational models of air-encapsulated hydrogel spheres in fluids; and (iv) assessing PIBV potential through direct pressure measurement in state of the art studies on biomimetic propulsion, hydrodynamic damping, and internal flows.Broader Impacts :Effective technologies for simultaneous characterization of flow kinematics and kinetics will benefit multiple scientific and engineering communities within academic, industrial, and government institutions and positively impact several applied and fundamental research fields. This project will reinforce technical training and education of the socioeconomically diverse student body in Brooklyn, New York. A suite of teaching modules for middle and high school students demonstrating various principles of fluid mechanics will be developed and implemented in classroom education through synergy with current NSF programs (RET site and GK-12 program). The project will also contribute to the removal of mental barriers across the extremal student populations defining the spectrum of metropolitan versus rural backgrounds in Brooklyn and Waterloo, Ontario by supporting the summer research experience for US students in the University of Waterloo. A one-day instructional short course on PIBV systems will be hosted at the Polytechnic Institute of New York University with emphasis on the measurement principle and uncertainty, data acquisition and processing, and integration into PIV systems. A wiki page about the project will be developed for outreach to the public and promoting PIBV.

Porfiri，Maurizio 1332204该提案首次解决了对流体流动中瞬时压力和速度的直接和同时全场测量的巨大挑战。提出的方法将通过为美国的学术，工业和政府机构提供实时的运动和动力学动力学的能力来改变当前的实验流体力学实践。尽管所提出的框架本质上是变革性的，但其实际实施需要最少升级到已建立的流体力学测量系统。具体而言，该建议涵盖了新型压力敏感的示踪剂颗粒的配方和融合到传统的粒子图像速度法（PIV）系统中，用于新型粒子图像Baro-velocimetry（PIBV）系统。所提出的微胶囊将包含封装在高度兼容的生物相容性水凝胶壳中的空气，这些空气被专门为具有不同波长分布的荧光配方，即根据水凝胶壳的应变而改变颜色。作用于粒子的压力会改变其体积，从而导致荧光响应的可测量变化。探针对压力的步骤变化的响应时间预计将处于微秒的范围内。此外，可以针对实验量身定制水凝胶微探针设计，以优化规定的压力范围内的灵敏度，并检测到低于十个pascals的压力水平。将这些新型的显微镜颗粒作为示踪剂，可以使用传统的PIV技术来测量流体内的速度场，而不会损失流动跟踪忠诚度或增加整体测量不确定性。智能优点：该项目的智力优点包括：（i）建立一个新颖的测量系统将启用整体范围的流动性，以启用整体范围的流动性。 （ii）设计，合成和校准基于水凝胶的新型生物相容性压力探针； （iii）对流体中空气封装的水凝胶球的基于力学的理论和计算模型进行制定和实验验证； （iv）通过直接压力测量在生物映射推进，流体动力阻尼和内部流程的艺术研究中评估PIBV潜力。Broader的影响：同时表征流动运动学和动力学同时表征的有效技术，将受益于学术，工业和政府领域内的多个科学和工程社区，并在政府机构内部和基础上有多种影响，并有效地影响了几种。该项目将加强纽约布鲁克林社会经济多样化的学生团体的技术培训和教育。将通过与当前的NSF计划（RET Site和GK-12计划）协同制定和实施的一组中学和高中生的教学模块，这些模块将在课堂教育中开发和实施。该项目还将有助于消除在布鲁克林和安大略省布鲁克林和滑铁卢的大都市与农村背景的范围内，通过为滑铁卢大学的美国学生提供夏季研究经验，从而定义了大都市与农村背景的范围。为期一天的PIBV系统教学简短课程将在纽约大学理工学院举办，重点是测量原理和不确定性，数据获取和处理以及集成到PIV系统中。有关该项目的Wiki页面将开发出来，以向公众推广并促进PIBV。

项目成果

An information-theoretic study of fish swimming in the wake of a pitching airfoil

鱼在俯仰翼型后游动的信息论研究

• DOI: 10.1016/j.physd.2019.02.014
• 发表时间: 2019
• 期刊: Physica D: Nonlinear Phenomena
• 作者: Zhang, Peng;Krasner, Elizabeth;Peterson, Sean D.;Porfiri, Maurizio
• 通讯作者: Porfiri, Maurizio