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Microscale 3D flow mapping with μDDPIV |
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| Authors: | Francisco Pereira Jian Lu Emilio Castaño-Graff Morteza Gharib |
| Institution: | (1) INSEAN—Italian Ship Model Basin, 00128 Rome, Italy;(2) Option of Bioengineering, California Institute of Technology, Pasadena, CA 91125, USA;(3) Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA |
| Abstract: | Three-dimensional (3D) quantitative flow visualization by tracking microscale particles has become an invaluable tool in microfluid mechanics. Defocusing digital particle image velocimetry (DDPIV) can recover spatial coordinates by calculating the separation between defocused images generated by an aperture mask with a plurality of pinholes. In this paper, a high-speed 3D micro-DDPIV (μDDPIV) system was devised based on this technique to achieve microscale velocity field measurements. A micro-volume of 400 × 300 μm2 with a depth of 150 μm has been mapped using an inverted microscope equipped with a 20× objective lens. The proposed technique was successfully applied to 3D tracking of 2-μm fluorescent particles inside an evaporating water droplet. |
| Keywords: | Defocusing DPIV 3D Particle Tracking Microfluidics Microscale Microscope Fluorescence Droplet |
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