Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 22, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/22/10/105401
Keywords
confocal micro-PIV; multiphase flow; wavelength separation
Funding
- Ministry of Education, Culture, Sports, Science, and Technology [17760134, 21760121]
- Grants-in-Aid for Scientific Research [21760121, 23760144, 17760134, 22710121] Funding Source: KAKEN
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This paper presents a micro-multiphase flow measurement technique, 'multicolour confocal micro-particle image velocimetry (PIV), and its application to the internal and surrounding flow measurement of a droplet moving through a microchannel. The present system measures the dynamic interaction between flows in two different phases, such as solid-liquid or liquid-liquid, simultaneously and separately. Unlike conventional confocal micro-PIV, this system features a wavelength separation optical device. The optical components (e. g., filters and dichroic mirror) are designed to separate fluorescent lights of tracer particles and to eliminate unnecessary scattered light depending on the characteristic wavelengths. The system can record a sequence of images at up to 2000 frames per second. It also has an in-plane spatial resolution of 0.284 mu m/pixel in a field of 227.2 mu m x 170.4 mu m and a confocal depth of 3.43 mu m using empty set 1.0 mu m particles and a 40x objective lens. This paper examines the performance of the present system, such as its ability to separate wavelengths. Furthermore, this system is applied to liquid-liquid two-phase flow, which consists of a water droplet and surrounding oil flow, in a microchannel. We succeeded in measuring each phase movement separately and simultaneously. As a result of the estimation of the out-of-plane velocity component, a three-dimensional flow structure is obtained and the interaction between each phase is investigated.
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