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arXiv 1509.01643physics.flu-dyn
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矩形微通道内粒子惯性迁移的直接测量

Direct Measurement of Particle Inertial Migration in Rectangular Microchannels

Kaitlyn Hood, Soroush Kahkeshani, Dino Di Carlo, Marcus Roper

摘要:

由于惯性升力,以高速行进通过微流体通道的颗粒从它们的起始流线迁移。理论预测了这些力的不同比例定律,并且几乎没有实验证据来验证理论。在这里,我们实验测量的三维位置和迁移速度的颗粒。我们的实验方法依赖于亚像素精确的粒子跟踪和深度维度的速度重建相结合,以跟踪数千个单独的粒子在三维空间中。我们发现,有没有简单的缩放粒子大小的惯性力,但迁移速度同意以及与数值模拟和两项渐近理论,不包含未测参数。

英文摘要:

Particles traveling at high velocities through microfluidic channels migrate from their starting streamlines due to inertial lift forces. Theories predict different scaling laws for these forces and there is little experimental evidence by which to validate theory. Here we experimentally measure the three dimensional positions and migration velocities of particles. Our experimental method relies on a combination of sub-pixel accurate particle tracking and velocimetric reconstruction of the depth dimension to track thousands of individual particles in three dimensions. We show that there is no simple scaling of inertial forces upon particle size, but that migration velocities agree well with numerical simulations and with a two-term asymptotic theory that contains no unmeasured parameters.

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