Development of a Multiphase "3-D+" Boundary-Layer Flow Visualization Technique

摘要9713857 J. Hoyt研制了一种适用于湍流显示的流动示踪剂，并由P.I.对于二维流动。 示踪剂由剪切增稠和高拉伸粘度流体组成，当流动变得湍流时，不像以前使用的示踪剂那样扩散。 本文还提出了将这种显示方法推广到三维流动，并应用于湍流边界层相干结构的方法。 新的方法提供了同时查看流动的三个方向（称为3-D+），这使得更容易识别的流动结构投影在三个不同的平面（侧，顶，和正面的流动方向）。 对马蹄形涡和大型有序结构的初步研究结果是非常有希望的。 实验工作将与布里斯托大学的R. H. J.塞尔林教授合作进行，实验设施将在布里斯托大学准备。 该方法有望为理解和模拟空间湍流结构（包括剪切流和尾流）提供新的见解。 该技术的应用到其他复杂的流，如分散流，泥沙输运，泥沙，和用于教育目的也被设想。 ***

Abstract 9713857 J. Hoyt A flow tracer suitable for turbulent flow visualization has been developed and tested by the P.I. for two-dimensional flows. The tracer, composed of shear-thickening and high extensional viscosity fluids, does not diffuse when the flow becomes turbulent like the previously used tracers do. The extension of the visualization method to three-dimensional flows, with application to coherent structures in turbulent boundary layer, is proposed. The new approach provides simultaneous viewing the flow three directions (called 3-D+), that allows for easier identification of the flow structures as projected on three different planes (side, top, and frontal to the flow direction). The preliminary results on "horseshoe" vortices and large organized structures are very promising. The experimental work will be performed in collaboration with Prof. R.H.J. Sellin of the University of Bristol, where experimental facilities are prepared. The method is expected to provide new insights into understanding and modeling of the spatial turbulent structures, including shear flows and wake flows. The application of the technique to other complex flow, such as dispersion flows, sediment transport, turbomachinery, and for educational purposes also is envisaged. ***