Viscosity estimation of a suspension with rigid spheres in circular microchannels using particle tracking velocimetry

Misa Kawaguchi; Tomohiro Fukui; Kenichi Funamoto; Miho Tanaka; Mitsuru Tanaka; Shigeru Murata; Suguru Miyauchi; Toshiyuki Hayase

doi:10.3390/mi10100675

Viscosity estimation of a suspension with rigid spheres in circular microchannels using particle tracking velocimetry

Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Miho Tanaka, Mitsuru Tanaka, Shigeru Murata, Suguru Miyauchi, Toshiyuki Hayase

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Suspension flows are ubiquitous in industry and nature. Therefore, it is important to understand the rheological properties of a suspension. The key to understanding the mechanism of suspension rheology is considering changes in its microstructure. It is difficult to evaluate the influence of change in the microstructure on the rheological properties affected by the macroscopic flow field for non-colloidal particles. In this study, we propose a new method to evaluate the changes in both the microstructure and rheological properties of a suspension using particle tracking velocimetry (PTV) and a power-law fluid model. Dilute suspension (0.38%) flows with fluorescent particles in a microchannel with a circular cross section were measured under low Reynolds number conditions (Re ≈ 10^-4). Furthermore, the distribution of suspended particles in the radial direction was obtained from the measured images. Based on the power-law index and dependence of relative viscosity on the shear rate, we observed that the non-Newtonian properties of the suspension showed shear-thinning. This method will be useful in revealing the relationship between microstructural changes in a suspension and its rheology.

Original language	English
Article number	675
Journal	Micromachines
Volume	10
Issue number	10
DOIs	https://doi.org/10.3390/mi10100675
Publication status	Published - 2019 Oct 1

Keywords

Circular microchannel
Microstructure
Particle tracking velocimetry
Power-law fluid
Pressure-driven flow
Rheology
Suspension

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10.3390/mi10100675

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title = "Viscosity estimation of a suspension with rigid spheres in circular microchannels using particle tracking velocimetry",

abstract = "Suspension flows are ubiquitous in industry and nature. Therefore, it is important to understand the rheological properties of a suspension. The key to understanding the mechanism of suspension rheology is considering changes in its microstructure. It is difficult to evaluate the influence of change in the microstructure on the rheological properties affected by the macroscopic flow field for non-colloidal particles. In this study, we propose a new method to evaluate the changes in both the microstructure and rheological properties of a suspension using particle tracking velocimetry (PTV) and a power-law fluid model. Dilute suspension (0.38%) flows with fluorescent particles in a microchannel with a circular cross section were measured under low Reynolds number conditions (Re ≈ 10-4). Furthermore, the distribution of suspended particles in the radial direction was obtained from the measured images. Based on the power-law index and dependence of relative viscosity on the shear rate, we observed that the non-Newtonian properties of the suspension showed shear-thinning. This method will be useful in revealing the relationship between microstructural changes in a suspension and its rheology.",

keywords = "Circular microchannel, Microstructure, Particle tracking velocimetry, Power-law fluid, Pressure-driven flow, Rheology, Suspension",

author = "Misa Kawaguchi and Tomohiro Fukui and Kenichi Funamoto and Miho Tanaka and Mitsuru Tanaka and Shigeru Murata and Suguru Miyauchi and Toshiyuki Hayase",

note = "Funding Information: Funding: This research was funded by the Collaborative Research Project of the Institute Tohoku University grant number J18L025 and J19I028. Funding Information: Acknowledgments: The authors would like to thank Daisuke Yoshino for technical assistance with the experiments. Part of the work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University. Publisher Copyright: {\textcopyright} 2019 by the authors.",

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AU - Kawaguchi, Misa

AU - Fukui, Tomohiro

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AU - Tanaka, Mitsuru

AU - Murata, Shigeru

AU - Miyauchi, Suguru

AU - Hayase, Toshiyuki

N1 - Funding Information: Funding: This research was funded by the Collaborative Research Project of the Institute Tohoku University grant number J18L025 and J19I028. Funding Information: Acknowledgments: The authors would like to thank Daisuke Yoshino for technical assistance with the experiments. Part of the work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University. Publisher Copyright: © 2019 by the authors.

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N2 - Suspension flows are ubiquitous in industry and nature. Therefore, it is important to understand the rheological properties of a suspension. The key to understanding the mechanism of suspension rheology is considering changes in its microstructure. It is difficult to evaluate the influence of change in the microstructure on the rheological properties affected by the macroscopic flow field for non-colloidal particles. In this study, we propose a new method to evaluate the changes in both the microstructure and rheological properties of a suspension using particle tracking velocimetry (PTV) and a power-law fluid model. Dilute suspension (0.38%) flows with fluorescent particles in a microchannel with a circular cross section were measured under low Reynolds number conditions (Re ≈ 10-4). Furthermore, the distribution of suspended particles in the radial direction was obtained from the measured images. Based on the power-law index and dependence of relative viscosity on the shear rate, we observed that the non-Newtonian properties of the suspension showed shear-thinning. This method will be useful in revealing the relationship between microstructural changes in a suspension and its rheology.

AB - Suspension flows are ubiquitous in industry and nature. Therefore, it is important to understand the rheological properties of a suspension. The key to understanding the mechanism of suspension rheology is considering changes in its microstructure. It is difficult to evaluate the influence of change in the microstructure on the rheological properties affected by the macroscopic flow field for non-colloidal particles. In this study, we propose a new method to evaluate the changes in both the microstructure and rheological properties of a suspension using particle tracking velocimetry (PTV) and a power-law fluid model. Dilute suspension (0.38%) flows with fluorescent particles in a microchannel with a circular cross section were measured under low Reynolds number conditions (Re ≈ 10-4). Furthermore, the distribution of suspended particles in the radial direction was obtained from the measured images. Based on the power-law index and dependence of relative viscosity on the shear rate, we observed that the non-Newtonian properties of the suspension showed shear-thinning. This method will be useful in revealing the relationship between microstructural changes in a suspension and its rheology.

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Viscosity estimation of a suspension with rigid spheres in circular microchannels using particle tracking velocimetry

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