Phase-locked confocal micro-PIV measurement for 3D flow structure of transient droplet formation mechanism in T-shaped microjunction

2018 ◽  
Vol 29 (11) ◽  
pp. 115204
Author(s):  
M Oishi ◽  
H Kinoshita ◽  
T Fujii ◽  
M Oshima
Keyword(s):  
Flow Structure ◽  
Formation Mechanism ◽  
Droplet Formation ◽  
3D Flow ◽  
Micro Piv ◽  
Piv Measurement

Investigation of Micro Droplet Formation in a T-Shaped Junction Using Multicolor Confocal Micro PIV

2008 ◽  
Author(s):  
Masamichi Oishi ◽  
Haruyuki Kinoshita ◽  
Marie Oshima ◽  
Teruo Fujii
Keyword(s):  
Multiphase Flow ◽  
Flow Structure ◽  
Dynamical Behavior ◽  
Internal Flow ◽  
Droplet Formation ◽  
Immiscible Fluids ◽  
Present System ◽  
Micro Particle Image Velocimetry ◽  
Micro Piv ◽  
Piv Measurement

This paper aims to investigate a mechanism of microdroplet formation using “multicolor confocal micro particle image velocimetry (PIV)” technique. The present system can measure dynamical behavior of multiphase flow separately and simultaneously. It also enables to identify the interactions between two immiscible fluids. We have applied this system to measure the water droplet formation at a micro T-shaped junction. We have also succeeded in dispersing fluorescent tracer particles into both phases. The interaction between the internal flow of to-be-dispersed water phase and of continuous oil phase is measured as a liquid-liquid multiphase flow. As a result of PIV measurement and interfacial geometry scanning, the relationship between flow structure of each fluid and interfacial geometry is clarified. It indicates that the gap between the tip of discontinuous flow and capillary wall, and interface area play an important role in the flow structure and shear stress on the interface.

J053045 Micro-PIV measurement of droplet formation phenomena in the micro T-shaped junction

2013 ◽  
Vol 2013 (0) ◽  
pp. _J053045-1-_J053045-5 ◽  
Author(s):  
Masamichi OISHI ◽  
Haruyuki KINOSHITA ◽  
Teruo FUJII ◽  
Marie OSHIMA
Keyword(s):  
Droplet Formation ◽  
Micro Piv ◽  
Piv Measurement

scholarly journals Confocal micro-PIV measurement of droplet formation in a T-shaped micro-junction

2009 ◽  
Vol 147 ◽  
pp. 012061 ◽  
Author(s):  
M Oishi ◽  
H Kinoshita ◽  
T Fujii ◽  
M Oshima
Keyword(s):  
Droplet Formation ◽  
Micro Piv ◽  
Piv Measurement

scholarly journals Numerical and Experimental Analyses of Three- Dimensional Unsteady Flow around a Micro-Pillar Subjected to Rotational Vibration

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 668 ◽  
Author(s):  
Kanji Kaneko ◽  
Takayuki Osawa ◽  
Yukinori Kametani ◽  
Takeshi Hayakawa ◽  
Yosuke Hasegawa ◽  
...  
Keyword(s):  
Flow Field ◽  
Moving Boundary ◽  
Three Dimensional ◽  
Steady Streaming ◽  
Micro Piv ◽  
Piv Measurement ◽  
Image Velocimetry ◽  
Measurement Tools ◽  
Rotational Vibration ◽  
Induced Flow

The steady streaming (SS) phenomenon is gaining increased attention in the microfluidics community, because it can generate net mass flow from zero-mean vibration. We developed numerical simulation and experimental measurement tools to analyze this vibration-induced flow, which has been challenging due to its unsteady nature. The validity of these analysis methods is confirmed by comparing the three-dimensional (3D) flow field and the resulting particle trajectories induced around a cylindrical micro-pillar under circular vibration. In the numerical modeling, we directly solved the flow in the Lagrangian frame so that the substrate with a micro-pillar becomes stationary, and the results were converted to a stationary Eulerian frame to compare with the experimental results. The present approach enables us to avoid the introduction of a moving boundary or infinitesimal perturbation approximation. The flow field obtained by the micron-resolution particle image velocimetry (micro-PIV) measurement supported the three-dimensionality observed in the numerical results, which could be important for controlling the mass transport and manipulating particulate objects in microfluidic systems.

scholarly journals Experimental Study on Micro PIV Measurement using a Micro Liquid Lens

2010 ◽  
Vol 8 (3) ◽  
pp. 22-28
Author(s):  
S.R. Jeong ◽  
T.D. Dang ◽  
J.H. Choi ◽  
G.M. Kim ◽  
C.W. Park
Keyword(s):  
Experimental Study ◽  
Liquid Lens ◽  
Micro Piv ◽  
Piv Measurement

Micro PIV Measurement of Electroosmotic Flow

2002 ◽  
pp. 374-376
Author(s):  
Haruyuki Kinoshita ◽  
Marie Oshima ◽  
Jong Wook Hong ◽  
Teruo Fujii ◽  
Tetsuo Saga ◽  
...  
Keyword(s):  
Electroosmotic Flow ◽  
Micro Piv ◽  
Piv Measurement

scholarly journals Unsteady RANS Simulation of Air Distribution in a Ventilated Classroom with Numerous Jets

2019 ◽  
Vol 111 ◽  
pp. 02010
Author(s):  
Nikolay Ivanov ◽  
Marina Zasimova ◽  
Evgueni Smirnov ◽  
Alexey Abramov ◽  
Detelin Markov ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Velocity Field ◽  
Flow Structure ◽  
Air Distribution ◽  
Air Velocity ◽  
3D Flow ◽  
Ansys Fluent ◽  
Test Conditions ◽  
Rectangular Form ◽  
Unsteady Rans

The study is devoted to the Unsteady Reynolds-Averaged Navies-Stokes (URANS) simulation of ventilation in an isothermal room with numerous jets supplied from ceiling diffusers. The computations of the airflow under the test conditions considered were carried out in the classroom of the Technical University of Sofia with no occupants. The room floor has a simple rectangular form, but several columns, beams, window sills, and four radiators are located inside the room that makes the geometry more complex. Air is supplied to the room through four ceiling fan coils, the Reynolds number is 2×104. Calculations were carried out using the ANSYS Fluent 18.2 software with the standard k-ε turbulence model chosen. Computational meshes of up to 33 million hexahedral cells clustered to the inlet and outlet sections were used. The main aim of the study presented is to analyze and discuss the complicated 3D flow structure in the room and to give foundation for future measurements of air velocity field in the room.

Experimental study on fluid selection for a stable Taylor cone formation via micro-PIV measurement

2020 ◽  
Vol 23 (3) ◽  
pp. 449-457 ◽  
Author(s):  
Jihoon Kim ◽  
Si Bui Quang Tran ◽  
Baekhoon Seong ◽  
Hyungdong Lee ◽  
Giho Kang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Taylor Cone ◽  
Micro Piv ◽  
Piv Measurement ◽  
Cone Formation ◽  
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