粒子图像测速
机械
粒子(生态学)
播种
活塞(光学)
流量(数学)
相(物质)
材料科学
惯性
粒径
测速
振幅
光学
物理
湍流
经典力学
热力学
化学
地质学
物理化学
波前
海洋学
量子力学
作者
Timo van Overbrüggen,Michael Klaas,Julio Soria,Wolfgang Schröder
标识
DOI:10.1088/0957-0233/27/9/094009
摘要
The right choice of seeding particles strongly influences the outcome of a particle-image velocimetry (PIV) measurement. Particles have to scatter enough light to be seen by cameras and follow the flow faithfully. As the flow following behavior depends on the inertia and therefore the size of the particle, smaller particles are desirable. Unfortunately, larger particles possess better light scattering behavior, which is especially important for volumetric PIV measurements. In this paper, the particle response of two exemplary solid particles to an oscillatory air flow created by a piston movement is analyzed and compared to analytic results by Hjelmfelt and Mockros (1966 Appl. Sci. Res. 16 149–61) concerning phase lag and amplitude ratio between particle movement and flow field. To achieve realistic experimental boundary conditions, polydispersed particles are used for the analysis. The analytic results show a strong dependence on the diameter. That is, using the volumetric mean diameter an overestimation of the phase lag of the particles is determined, whereas an underestimation of phase lag is computed for the number mean diameter. Hence, for polydispersed particles a more general analysis than that based on the particle mean diameter is required to determine in detail the particle following behavior.
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