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

使用数字全息显微镜同时测量 3D 流动结构和壁剪切应力

• 批准号: 0625571
• 负责人: Joseph Katz
• 金额: $ 30万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0625571&HistoricalAwards=false
• 关键词: Simultaneous; Measurements; 3D; Flow; Structures

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.

提案编号：CTS-0625571原理研究者：约瑟夫·卡津施特判：约翰·霍普金斯大学大学智能优点：研究人员建议使用一种新型的数字全息方法来检查规范湍流边界层墙壁附近的流动特征。这种实验技术是原始的，并承诺开创性的导致理解湍流壁界流。该提案给人留下了深刻的印象，并认为高分辨率数字全息显微镜（DHM）的发展将是湍流的宝贵测量工具。该技术的高空间分辨率也具有相对较大的测量区域，它提供了获得速度，壁剪应力以及近壁流量结构的瞬时分布的能力。以在不同时间记录的速度场对相同的粒子跟踪同一组颗粒也提供了材料加速度。过去，PI一直非常有生产力和创新性，并且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通过推进新兴的，高空间分辨率测量工具的湍流，并在规范边界层上提供有价值的数据集，从而对湍流产生重大影响。这项工作将在教育计划中使用，包括两名研究生以及来自巴尔的摩理工学院的高中生。该技术的详细信息也将提供给社区。