SGER: Magnetic Resonance Velocimetry and Thermometry for Study of Complex Turbulent Flows

ABSTRACTPROPOSAL没有。当前位置主要研究人员：JOHN eaton机构：斯坦福大学复杂湍流的磁共振测速和测温研究目标是开发一种称为磁共振测速（MRV）的速度测量技术，该技术可以提供前所未有的技术和自然发生的复杂流动的详细信息，并评估进行温度测量的潜力。MRV使用标准的医用磁共振成像系统和4D相对比成像技术来提供空间分辨的三分量速度测量。在不到一小时的时间内，可以获得数百万个空间点的平均速度测量值。该方法包括进行实验，以解决有关在湍流中使用3D和4D MRV序列的开放性问题，并评估使用类似序列测量流动流体温度的潜力。如果研究表明，适当优化的MRV可以准确地用于大范围的湍流参数，这将对理解复杂的流动有很大的贡献。MRV的发展将在科学、工程和医学领域产生广泛的影响。MRV技术与快速成型技术的结合为内流系统的工程设计提供了一种新的范式。从概念到全场测量的快速周转时间意味着未来的设计将基于全流场信息，而不是近似分析或流动可视化。在医学领域，测量不确定度的定量评估将有助于MRV进入可接受的临床实践领域。随着湍流测量的改进和温度测量的增加，应用范围将大大扩大。在科学领域，MRV和MR测温技术为工程和自然系统中遇到的复杂内部流动提供了前所未有的测量能力。在这些先进的多学科测量技术方面，对研究生和本科生的培训具有重要的教育影响。

ABSTRACTPROPOSAL NO.: CTS-0432478PRINCIPAL INVESTIGATORS: JOHN EATONINSTITUTION: STANFORD UNIVERSITY Magnetic Resonance Velocimetry and Thermometry for Study of Complex Turbulent FlowsThe goal is to develop a velocity measurement technique known as Magnetic Resonance Velocimetry (MRV) that can provide unprecedented access to detailed information in technologically and naturally occurring complex flows, and also to evaluate the potential for making temperature measurements. MRV uses standard medical magnetic resonance imaging systems and the 4D phase-contrast imaging technique to provide spatially-resolved, three-component velocity measurements. Mean velocity measurements can be acquired at millions of spatial points in less than one hour. The approach involves performing experiments that will resolve open questions about the use of 3D and 4D MRV sequences in turbulent flows and to assess the potential for using similar sequences for the measurement of the temperature in flowing fluids. If the research shows that properly optimized MRV can be used accurately for a wide range of turbulence parameters, this would lead to great contributions in understanding complex flows. Development of MRV will have a broad impact in the scientific, engineering, and medical fields. MRV combined with rapid prototyping offers a new paradigm for engineering design of internal flow systems. The rapid turnaround time from concept to full-field measurements means that design in the future will be based on full flow field information instead of approximate analysis or flow visualization. In the medical arena, the quantitative assessment of measurement uncertainty will help to move MRV into the realm of accepted clinical practice. With the improvements in turbulent flow measurements and the addition of temperature measurement, the range of applications will expand significantly. In the scientific arena, MRV and MR thermometry offer unprecedented measurement capability for complex internal flows encountered in both engineered and natural systems. Training of graduate and undergraduate students in these advanced multidisciplinary measurement techniques represents a significant educational impact.