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• W46481714 abstract "Steady streaming flows, also known as acoustic streaming, are the steady currents formed in a fluid undergo high frequency oscillations. Hydrodynamic tweezers is a microfluidic device utilizes this phenomenon to create the steady streaming microeddies formed by the interaction between oscillating fluid and solid boundaries that can trap objects of various sizes and densities. In this study, a microfluidic device with an array of cylinder posts built to generate the microeddy arrays was imaged by a volumetric 3-D ?PTV system to investigate the flow field. The oscillation frequency is varied from 2840Hz to 20000Hz. The 3-D ?PTV system utilizes a three-pinhole plate, color-coded by color filters of different wavelengths, to create a defocused exposure pattern on the image sensor plane for each particle. Since the particle image exposure is color-coded, each color channel of the color camera acts as an independent image sensor. Three independent forward scattering LED illumination sources are used to provide illumination for each color channel, and a color separation algorithm is used to minimize the measurement errors due to cross-talk between color filters. A cascade correlation peak-finding algorithm is used to resolve overlap particle images, and the particle locations are reconstructed by a calibration-based epipolar line search method. Particle tracking is done by a vision-based particle-tracking algorithm to identify, locate and track the Lagrangian motions of the tracer particles and reconstruct the flow field. The volume of imaging is 600 × 600 × 150 ?m³. The measured flow field shows that four eddies were formed around each post and dividing streamlines were formed between the posts to create a symmetric cell-like flow structure. The flow is three-dimensional and symmetric flow structure was found in the Z direction. The eddy size decreased with increasing oscillation frequency, and the eddy center moved towards the post as the frequency increased" @default.
• W46481714 created "2016-06-24" @default.
• W46481714 creator A5031043368 @default.
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• W46481714 date "2013-07-02" @default.
• W46481714 modified "2023-09-23" @default.
• W46481714 title "Volumetric Velocity Measurements of an Acoustic Streaming Microeddy Array using Color-Coded Three-Dimensional Micro Particle Tracking Velocimetry" @default.
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• W46481714 hasPublicationYear "2013" @default.
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