Light Scattering Experiments and Fluid Flow

小行星9701688 本实验研究计画系关于二维及三维层流紊流之研究，以及聚合物添加剂对层流紊流之影响。 特别强调了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，还对封闭容器中振荡格栅产生的湍流进行了实验研究。 这个实验探测了大部分流体和漂浮在表面上的颗粒的速度波动。 波动的空间相关性是从两个分离点处的速度测量来测量的。 肥皂膜可以作为自然界中流体流动的模型。 这些薄膜表现出各种常见的流动，包括非常困难的湍流。 特别感兴趣的一个领域是剪切在低皂膜中的作用以及液体粘度的概念所起的作用。 值得注意的是，观察到皂膜的粘度是水的100倍，即使该膜是99%的水和1%的添加剂。 研究的另一个问题是湍流流体上的表面运动，这与研究浮标的运动或湍流海洋表面污染物的分散有关。 ***

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. ***