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发表于 2011-2-22 18:47:38
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建议你搞到这篇文章来读. 这篇文章提到了示踪粒子的选择对结果的影响, 他们实验了6种不同的粒子, 直径在1-5毫米之间. 密度分别为0.04 ,0.50 ,0.50 ,0.73, 0.90和 0.90 g/cm3. 我想对你会很有用的.
Large scale PIV-measurements at the surface of shallow water flows Original Research Article
Flow Measurement and Instrumentation, Volume 13, Issues 5-6, December 2002, Pages 237-245
V. Weitbrecht, G. Kühn, G. H. Jirka
我摘录一小段做参考. 我认为, 你自己也必须知道你想要达到什么样的空间解析度, 你想做普通PIV, 或者高速PIV. 你到底对分析什么感兴趣.
surface PIV measurements are relatively straightforward because no laser is needed. In this case the measuring plane is given by the water surface which means that for illumination, standard flood lights can be used, provided that the water surface is not strongly disturbed by wave motions. To keep the developed system flexible, a commercial PIV package including camera, frame grabber, and controlling and evaluation software has been used, with special adaptation to the large scale laboratory problem.
Measurements of velocity fields in large areas with high spatial and temporal resolution are difficult because of the problem of homogeneous particle seeding on the water surface. To solve this problem a particle dispenser has been developed which can be mounted a short distance upstream of the measurement area over the water surface. A second major problem relates to the tendency of most floating particles to agglomerate.
a very high width/depth ratio of the flow, which means that the flow is very shallow. Large coherent structures that emerge at the groin heads dominate the flow and the associated mixing processes.
[ 本帖最后由 silkroad 于 2011-2-22 19:35 编辑 ] |
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