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Research Papers: Techniques and Procedures

Measurement of Viscoelastic Fluid Flow in the Curved Microchannel Using Digital Holographic Microscope and Polarized Camera

[+] Author and Article Information
Xiao-Bin Li

Mem. ASME
School of Energy Science and Engineering,
School of Mechatronics Engineering,
Harbin Institute of Technology,
Harbin 150001, China;
Institute of Industrial Science,
The University of Tokyo,
Tokyo 153-8505, Japan;
Key Laboratory of Efficient Utilization of Low and
Medium Grade Energy,
Tianjin University,
Ministry of Education of China,
Tianjin 300072, China
e-mail: lixb@hit.edu.cn

Masamichi Oishi

Institute of Industrial Science,
The University of Tokyo,
Tokyo 153-8505, Japan
e-mail: oishi@iis.u-tokyo.ac.jp

Tsukasa Matsuo

Ushio Inc.,
Yokohama 225-0004, Japan
e-mail: t.matsuo@ushio.co.jp

Marie Oshima

Institute of Industrial Science,
The University of Tokyo,
Tokyo 153-8505, Japan
e-mail: marie@iis.u-tokyo.ac.jp

Feng-Chen Li

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: lifch@hit.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 14, 2015; final manuscript received March 10, 2016; published online June 6, 2016. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 138(9), 091401 (Jun 06, 2016) (8 pages) Paper No: FE-15-1663; doi: 10.1115/1.4033319 History: Received September 14, 2015; Revised March 10, 2016

This paper aims to develop a three-dimensional (3D) measurement approach to investigate the flow structures of viscoelastic fluid in the curved microchannel by using digital holographic microscope (DHM). The measurement system uses off-axis holographic/interferometric optical setup for the moving target, and the real-time three-dimensional-three-components (3D3C) particle tracking velocimetry (PTV) can be achieved based on the analysis of phase information of holograms. To diagnose the irregular flow inside the microchannel, the 3D temporal positions of tracer particles in the volume of 282 μm × 282 μm × 60 μm have been detected and velocity field was calculated based on the PTV algorithm. Moreover, to explain the flow field inside the curved microchannel, for the first time the polarized high-speed camera was utilized to identify the strong elongation in the viscoelastic fluid. The DHM is proven to be successful for the measurements of microfluidic flow, especially for the truly real-time 3D motions.

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Figures

Grahic Jump Location
Fig. 3

The original hologram (a) and the reconstructed intensity image (left of (b)) and phase image (right of (b)) (depth: center plane).

Grahic Jump Location
Fig. 7

Flow structures and the reduced vector fields of viscoelastic fluid flow in both inflected part and curved part. (a) and (b) Q = 1.0 μL/min, 50 frames at 2000 fps; (c) and (d), the corresponding flow fields based on (a) and (b), where the vector length is reduced by the local velocity magnitude. Tracer concentration is 0.016% in volume.

Grahic Jump Location
Fig. 4

Flow structures in the curved microchannel. Shown in the images are the particle trajectories, where the color means different instant of each frame. The measurement region is as shown in Fig. 3. (a) Q = 0.25 μL/min, 50 frames at 1000 fps; (b) Q = 0.60 μL/min, 50 frames at 1000 fps; (c) Q = 1.0 μL/min, 50 frames at 2000 fps; (d) Q = 1.0 μL/min, 20 frames at 180 fps. Note the image numbers and frame rate change in (c) and (d). Tracer concentration is 0.008% in volume.

Grahic Jump Location
Fig. 2

Schematic of microchannel

Grahic Jump Location
Fig. 1

Schematic of optical design

Grahic Jump Location
Fig. 5

Flow structures at different height of microchannel by using confocal microPIV [11]. Shown in the images are streamlines and vorticity fields. (a) 20 μm off the bottom; (b) 40 μm off the bottom (center plane); and (c) 60 μm off the bottom.

Grahic Jump Location
Fig. 6

Flow structures in the circular part. Shown are particle trajectories and corresponding vector field. (a) Q = 0.25 μL/min, 50 frames at 1000 fps; (b) Q = 0.60 μL/min, 50 frames at 1000 fps; (c) Q = 1.0 μL/min, 20 frames at 2000 fps; (d) Q = 1.0 μL/min, flow field obtained at 2000 fps. Note the image numbers and frame rate change in (c) and (d). Tracer concentration is 0.008% in volume.

Grahic Jump Location
Fig. 8

Schematic of polarization imaging system

Grahic Jump Location
Fig. 9

The polarized image of internal flow and the elastic stress distribution

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