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 journalArticlepeer-review

10 Citations (Scopus)


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 languageEnglish
Article number675
Issue number10
Publication statusPublished - 2019 Oct 1


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


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