Microparticle image velocimetry (μPIV) study of microcavity flow at low Reynolds number

Shen, Feng; Xiao, Peng; Liu, Zhaomiao

doi:10.1007/s10404-015-1575-3

Cited by 33 publications

(17 citation statements)

References 47 publications

(110 reference statements)

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“…Thus, it is important to measure the internal flow field of the microchannel in order to understand the flow mechanism in a micro-scale. Recently, some researchers developed the microscopic particle image velocimetry (micro-PIV) measurement method to obtain the flow field under micro-scale and have performed numerous studies focusing on the microchannel [21][22]. However, previous measurements were mostly carried out in microchannels wider than 20 μm, and the fluid medium was deionized water.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Zhang

Hao

et al. 2016

Chem Eng & Technol

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The flow characteristics of deionized water and kerosene through smooth rectangular microchannels with hydraulic diameters ranging from 5.0μm to 17.4μm are studied experimentally. Through the special design of the experimental setup, the range of the measured average liquid velocity in microchannels can reach 0.001mm/s to 1 mm/s, corresponding to Reynolds number ranges from10 -5 to 10 -2 . The experimental data show that the pressure drop exhibits a linear relationship with the average velocity of the fluid in microchannels whose scale are larger than 2μm. Moreover, the experimental Darcy friction factor is consistent with the classical laminar flow theory of Newtonian fluid. Microscopic particle image velocimetry (micro-PIV) was also utilized to measure the velocity distribution inside of the macro-channels, and the experimental results are consistent with classical hydrodynamic theory.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Zhang

Hao

et al. 2016

Chem Eng & Technol

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“…, which represents the particle inertia 30 . Flow separation from the leading cavity wall results in the formation of a laminar vortex inside the cavity 36 .…”

Section: Materials and Methods For More Details)mentioning

confidence: 99%

“…Polystyrene beads (average diameter=0.86 µm, density=1.05 g/cm 3 ; Thermo Fisher) were used as tracers to visualize the vortex flow. Details of the micro-PIV system were described previously 36 . We then visualized the orbiting motion of a finite-size particle (diameter d=30 µm) along a stable meniscus-shaped orbit in the vortex using a high-speed microscopic imaging system (Fig.…”

Section: Methodsmentioning

confidence: 99%

Particle orbiting motion in a confined microvortex

Shen

et al. 2021

Preprint

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Particle motion in viscous fluids is a common and fascinating phenomenon. The hydrodynamics of a trapped finite-size particle recirculating along a stable orbit within a microvortex is still puzzling. Herein we report experimental observations of the orbiting motion of a finite-size particle in a vortex confined in a microcavity. The orbiting particle keeps crossing the streamlines with acute changes in velocity along the orbit, which can be divided into three stages: acceleration, swerving, and following. By examining the relationship between particle orbit and vortex streamlines, we uncover a particle slingshot effect and slip motion. Particle motion and vortex structure in three dimensions are also studied, revealing many new fascinating particle motion phenomena. The results provide new insights into the physics of particle motion in vortices.

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“…The widths of the main and side channels are both 500 μm, and the measuring point is 5 mm from the inlet and outlet of the main channel. A fully developed laminar flow can be obtained after a distance of [ 62 ]

…”

Section: Simulation Methodsmentioning

confidence: 99%

An Easy Method for Pressure Measurement in Microchannels Using Trapped Air Compression in a One-End-Sealed Capillary

Shen

et al. 2020

Micromachines

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Pressure is one basic parameter involved in microfluidic systems. In this study, we developed an easy capillary-based method for measuring fluid pressure at one or multiple locations in a microchannel. The principal component is a commonly used capillary (inner diameter of 400 μm and 95 mm in length), with one end sealed and calibrated scales on it. By reading the height (h) of an air-liquid interface, the pressure can be measured directly from a table, which is calculated using the ideal gas law. Many factors that affect the relationship between the trapped air volume and applied pressure (papplied) have been investigated in detail, including the surface tension, liquid gravity, air solubility in water, temperature variation, and capillary diameters. Based on the evaluation of the experimental and simulation results of the pressure, combined with theoretical analysis, a resolution of about 1 kPa within a full-scale range of 101.6–178 kPa was obtained. A pressure drop (Δp) as low as 0.25 kPa was obtained in an operating range from 0.5 kPa to 12 kPa. Compared with other novel, microstructure-based methods, this method does not require microfabrication and additional equipment. Finally, we use this method to reasonably analyze the nonlinearity of the flow–pressure drop relationship caused by channel deformation. In the future, this one-end-sealed capillary could be used for pressure measurement as easily as a clinical thermometer in various microfluidic applications.

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Microparticle image velocimetry (μPIV) study of microcavity flow at low Reynolds number

Cited by 33 publications

References 47 publications

Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Characteristics of Liquid Flow in Microchannels at very Low Reynolds Numbers

Particle orbiting motion in a confined microvortex

An Easy Method for Pressure Measurement in Microchannels Using Trapped Air Compression in a One-End-Sealed Capillary

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