Simultaneous Measurements of 3D Flow Structures and Wall Shear Stresses Using Digital Holographic Microscopy

建议编号：CTS-0625571PRINCIPAL研究人员：Joseph KATZINSTUTION：Johns Hopkins UNIVERSITY智慧优点：研究人员建议使用一种新的数字全息方法来研究正则湍流边界层中壁面附近的流动特征。这一实验技术是独创的，有望在理解湍流壁面边界流方面取得开创性的结果。专家小组对这项建议印象非常深刻，并认为高分辨率数字全息显微镜(DHM)的发展将是测量湍流的宝贵工具。该技术具有较高的空间分辨率，具有较大的测量范围，能够获得速度、壁面剪应力以及近壁流动结构的瞬时分布。在不同时间记录的速度场对中跟踪同一组粒子也提供了材料加速度。过去，绩效指标非常富有成效和创新性，使用该技术的初步结果令人信服。更广泛的影响：这项研究的成功完成将对湍流领域产生重大影响，因为它将推动一种新兴的、高空间分辨率的湍流测量工具，并提供关于典型边界层的宝贵数据集。这项工作将用于一项教育计划，涉及巴尔的摩理工学院的两名研究生和高中生。这项技术的细节也将向社区提供。

PROPOSAL NO.: CTS-0625571PRINCIPAL INVESTIGATOR: JOSEPH KATZINSTITUTION: JOHNS HOPKINS UNIVERSITYIntellectual Merit: The investigators propose using a novel digital holographic method to examine flow features near the wall in canonical turbulent boundary layers. This experimental technique is original and promises groundbreaking results in the understanding of turbulent wall bounded flows. The panel was very impressed with the proposal and felt the development of the high resolution digital holographic microscopy (DHM) would be a valuable measurement tool for turbulence. The high spatial resolution of the technique as well has the relatively large measurement region provides the ability to obtain the instantaneous distribution of velocity, wall shear stress as well as near wall flow structures. Tracking the same group of particles in pairs of velocity fields recorded at different times also provides the material acceleration. The PIs have been extremely productive and innovative in the past and the preliminary results using the technique are convincing. Broader Impacts: Successful completion of this research would have a substantial impact in the field of turbulence by advancing an emerging, high spatial resolution measurement tool for turbulence, as well as providing a valuable data set on canonical boundary layers. This work will be used in an educational plan by involving two graduate students as well as senior high-school students from the Baltimore Polytechnic Institute. Details of the technique will also be made available to the community.