MRI: Development of Long Distance Microscope Velocimetry System for Bridging Macro and Microscales

建议书编号CTS-0320327首席研究员：明尼苏达大学E.Longmire这笔赠款用于开发一种独特的仪器系统，用于同时表征微观和宏观流动的演变。该系统将首先用来研究两种流动，这两种流动的性质具有广泛的尺度：湍流和界面流动。该系统将与LaVision，Inc.合作开发，将包括所需的照明和成像光学设备，以在两个放大倍数和足够高的重复率下同时应用立体粒子成像测速技术，以表征流动演变。此外，还将开发定制的校准目标和软件以及定制的分析软件，以便在重叠的更小和更大的视场中获得高精度的结果。在较小的视场中，系统将能够分辨出(100平方微米)或更小的区域内的速度矢量，而较大的视场可能覆盖(10平方厘米)或更大的区域。这些方面将允许在宏观行为的背景下观察和描述不断演变的微观尺度。该系统开发完成后，将立即用于湍流边界层和液滴汇聚的研究。所描述的仪器将为理解界面汇聚和湍流边界层中涡旋的相互作用提供革命性的进展。此外，该系统的可用性将允许在其他流体动力学领域进行新颖和开创性的研究，例如，层流/湍流转变、MEMS宏观流动控制、液体喷射和液滴破碎、三维不稳定性和湍流分离流动。在明尼苏达大学，几名研究生将参与拟议的系统。一人将设计、开发和集成系统硬件和软件，另一些人将为上述研究项目使用该系统。此外，由REU和RET补充品资助的本科生研究人员和高中物理教师将在夏季进行并参与短期调查。预计教师将把他们在尖端测量技术和工程应用方面的经验带回课堂。

Proposal No. CTS-0320327Principal Investigator: E. Longmire, University of MinnesotaThis grant is for a unique instrumentation system to be developed for simultaneous characterization of microscopic and macroscopic flow evolution. The system will first be used to examine two flows, which by their nature are characterized by a wide range of scales: turbulent and interfacial flows. The system, which will be developed in collaboration with LaVision, Inc, will include the required illumination and imaging optics to apply the Stereo-Particle Imaging velocimetry technique simultaneously at two magnifications and at repetition rates high enough to characterize the flow evolution. In addition, custom calibration targets and software as well as custom analysis software will be developed in order to achieve results of high accuracy in the overlapping smaller and larger fields of view. In the smaller field of view, the system will be able to resolve velocity vectors in areas of (100 square micrometer) or less, while the larger field of view may cover an area of (10 square cm) or more. These aspects will allow for observation and characterization of the evolving microscopic scales in the context of the macroscopic behavior. After the system is developed, it will be employed immediately in studies of turbulent boundary layers and drop coalescence.The instrumentation described will provide revolutionary advances in the understanding of both coalescence at interfaces and the interaction of eddies in turbulent boundary layers. Also, the availability this system will allow for novel and groundbreaking research in additional areas of fluid dynamics including, for example, laminar/turbulent transition, control of macroscopic flows with MEMS, liquid jet and drop break up, three-dimensional instabilities, and turbulent separated flows.The proposed system, which could become a product supported by multiple vendors, is expected to be useful to researchers in many areas of fluid dynamics. At the University of Minnesota, several graduate students will be involved with the proposed system. One will design, develop, and integrate the system hardware and software, and others will use the system for the research projects described above. Also, undergraduate researchers and high school physics teachers, funded by REU and RET supplements, will perform and participate in short-term investigations during the summers. The teachers are expected to bring their experiences with cutting edge measurement techniques and engineering applications back to the classroom.