Qualitative flow visualization using colored lights and reflective flakes
Qualitative flow visualization using colored lights and reflective flakes
复制标题
使用彩色光和反射片进行定性流动可视化
DOI：
10.1063/1.869868
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发表时间：
1999
影响因子：
4.6
通讯作者：
J. M. Bauer
中科院分区：
文献类型：
--
作者：
S. Thoroddsen;J. M. Bauer
我们提出一种新颖的流动可视化技术，该技术将反光薄片与彩色照明相结合。使用三束不同颜色的准直光束来照亮流体，每种颜色从不同方向照射。通过这种方式，薄片反射光的颜色能指示局部薄片的取向。在复杂的三维（3 - D）流中，薄片取向通常是局部速度梯度张量的复杂函数，但如果已知潜在的速度场就可以计算出来。最近，Gauthier等人[《流体物理学》10卷，2147页（1998年）]使用单色光证明了这一点。然而，在复杂的流场中，薄片的分布可能会因运动而重新排列，从而使局部反射强度取决于取向和薄片浓度。但是，颜色不受流体内薄片局部数量密度的影响，这使得获取定量信息成为可能。通过对泰勒 - 库埃特装置中漩涡的更精细细节进行可视化，展示了该技术。
We present a novel flow-visualization technique utilizing reflective flakes in combination with color illumination. Three differently colored columated light beams are used to illuminate the flow, each color being directed from a separate direction. In this way, the color of the light reflected from the flakes gives an indication of the local flake orientation. The flake orientation in complex three-dimensional (3-D) flow is in general a complicated function of the local velocity gradient tensor, but can be calculated if the underlying velocity field is known. This has recently been demonstrated by Gauthier et al. [Phys. Fluids. 10, 2147 (1998)] using monochome light. In complex flow fields the distribution of flakes may, however, be rearranged by the motion, thus making the local intensity of reflection depend on both orientation and flake concentration. The color is, however, immune to the local number density of flakes inside the flow, making quantitative information possible. This technique is demonstrated by visualizing the finer details of vortices in a Taylor–Couette device.