MRI: Acquisition of a high-speed volumetric particle image velocimetry system for fluid mechanics research and research training in science, mathematics, and engineering

MRI：获取高速体积粒子图像测速系统，用于流体力学研究和科学、数学和工程方面的研究培训

• 批准号: 1919570
• 负责人: Ali Hamed
• 金额: $ 38.47万
• 依托单位: Union College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-15 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1919570&HistoricalAwards=false
• 关键词: MRI; Acquisition; speed; volumetric; particle

Particle image velocimetry is a laser-based diagnostic technique used for non-intrusive flow velocity measurements. The acquisition of this instrument will enable interdisciplinary fluid mechanics research in biological, environmental, and engineering applications. The topics to be investigated span from turbulent flow over rough surfaces to blood flow within a heart. The findings of this research will aid in improving environmental protection and restoration efforts, reducing drag and increasing efficiency of flows across a surface, and determining the causes of congenital heart disorders. The state-of-the-art instrumentation will strengthen undergraduate research training, teaching, and outreach efforts at Union College. The research projects aided by this instrument will provide engaging research experiences for undergraduate students who will work alongside faculty. The use of this equipment also will be incorporated into the curriculum through demonstrations, laboratory experiments, and projects in science, mathematics, and engineering courses. Through outreach activities, the project researchers will spark the interest of underrepresented and economically disadvantaged middle and high school students in the fields of science, technology, engineering, and mathematics. Measurement of all three velocity components at high speeds throughout a volume will enable innovative research that will 1) investigate turbulent boundary layer perturbation by roughness elements arranged in tandem to understand the effects of sheltering and the modification to coherent structures; 2) characterize the turbulent flow over heterogeneous canopies resembling aquatic vegetation to highlight the effects of regional heterogeneities; 3) examine the flow over aerogel-based super-hydrophobic surfaces, which have potential to reduce drag without the need for complex fabrication approaches; 4) characterize the blood flow within the embryonic chick heart during its early formation stages to better understand the valve-less pumping mechanisms; 5) inspect the structure of convective flows within bryophyte shoot systems, which are suspected but have yet to be confirmed or quantified; and 6) determine the mechanisms of transition to turbulence induced by distributed roughness and describe the interaction of generated disturbances, which is necessary for designing roughness to mitigate transition.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.

粒子图像测速仪是一种基于激光的诊断技术，用于非侵入性流速测量。该仪器的收购将使生物、环境和工程应用中的跨学科流体力学研究成为可能。要研究的课题从粗糙表面上的湍流到心脏内的血液流动。这项研究的结果将有助于改善环境保护和修复工作，减少阻力和提高表面流动的效率，并确定先天性心脏病的原因。最先进的仪器将加强联合学院的本科生研究培训、教学和推广工作。由该仪器资助的研究项目将为将与教师一起工作的本科生提供引人入胜的研究体验。这种设备的使用还将通过演示、实验室实验以及科学、数学和工程课程的项目纳入课程。通过外展活动，项目研究人员将激发未被充分代表和经济困难的初中生和高中生在科学、技术、工程和数学领域的兴趣。在整个体积中高速测量所有三个速度分量将使创新研究成为可能，这些研究将1)通过串联排列的粗糙元素来调查湍流边界层扰动，以了解遮蔽和对相干结构的修改的影响；2)表征类似水生植物的异质树冠上的湍流流动，以突出区域不均一性的影响；3)研究基于气凝胶的超疏水表面的流动，这些表面具有减少阻力的潜力，而不需要复杂的制造方法；4)表征胚胎雏鸡心脏形成早期阶段的血液流动，以更好地了解无阀泵送机制；5)检查苔藓植物枝条系统内对流流动的结构，这是可疑的，但尚未得到确认或量化；以及6)确定由分布粗糙度引起的向湍流转变的机制，并描述所产生的扰动的相互作用，这是设计粗糙度以缓解转变所必需的。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。