Light Scattering Experiments and Fluid Flow

光散射实验和流体流动

• 批准号: 9701688
• 负责人: Walter Goldburg
• 金额: $ 30万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9701688&HistoricalAwards=false
• 关键词: Light; Scattering; Experiments; Fluid; Flow

9701688 Goldburg This experimental research project is concerned with the study of laminar turbulent flow in 2 and 3 dimensions, and the influence of polymer additives on this flow. Special emphasis is placed on the quasi- two dimensional flow produced in soap films, and the interaction of flowing film with the surrounding air. In addition, experiments are carried out on turbulence generated by an oscillating grid in a closed container. This experiment probes the velocity fluctuations in the bulk of the fluid and for particles floating on the surface. The spatial correlations of the fluctuations are measured from the measurement of the velocity at two separated points. %%% Soap films can serve as a model for the flowing of fluids in nature. The films exhibit various types of commonly observed flows, including the very difficult type of turbulent flow. One area of special interest is the effect of shear in low in a soap film and the role paid by the concept of the viscosity of the liquid. It is of great interest to note that the soap film is observed to have a viscosity a hundred times that of water, even though the film is 99% water and 1% additive. Another problem studied is the surface motion on the turbulent fluid which is related to the study of the motion of buoys or the dispersion of a contaminant of the surface of a turbulent sea. ***

这个实验研究项目是关于二维和三维层流湍流的研究，以及聚合物添加剂对这种流动的影响。特别强调的是在肥皂膜中产生的准二维流动，以及流动膜与周围空气的相互作用。此外，还对密闭容器中振荡网格产生的湍流进行了实验研究。这个实验探测了流体的整体速度波动和漂浮在表面上的颗粒。波动的空间相关性是通过测量两个分离点的速度来测量的。肥皂膜可以作为自然界中流体流动的模型。这些薄膜展示了各种常见的流动类型，包括非常困难的湍流类型。我们特别感兴趣的一个领域是肥皂膜中的剪切效应和液体粘度概念所起的作用。值得注意的是，人们观察到肥皂膜的粘度是水的100倍，尽管它是99%的水和1%的添加剂。研究的另一个问题是湍流流体的表面运动，这与研究浮标的运动或湍流海洋表面污染物的扩散有关。＊＊＊