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Open AccessArticle

Viscosity Estimation of a Suspension with Rigid Spheres in Circular Microchannels Using Particle Tracking Velocimetry

1
Department of Mechanical Engineering, Kyoto Institute of Technology, Kyoto 606-8585, Japan
2
Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(10), 675; https://doi.org/10.3390/mi10100675
Received: 17 September 2019 / Revised: 1 October 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Micro/Nano Devices for Blood Analysis)
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. View Full-Text
Keywords: suspension; rheology; power-law fluid; circular microchannel; pressure-driven flow; particle tracking velocimetry; microstructure suspension; rheology; power-law fluid; circular microchannel; pressure-driven flow; particle tracking velocimetry; microstructure
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Kawaguchi, M.; Fukui, T.; Funamoto, K.; Tanaka, M.; Tanaka, M.; Murata, S.; Miyauchi, S.; Hayase, T. Viscosity Estimation of a Suspension with Rigid Spheres in Circular Microchannels Using Particle Tracking Velocimetry. Micromachines 2019, 10, 675.

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