Abstract
We report a novel technique capable of measuring the kinematic shear viscosity of Newtonian liquids with steady streaming flows in microfluidic devices. This probe-free microrheological method utilizes sub-kilohertz liquid oscillation frequencies around a cylindrical obstacle, ensuring that the inner streaming layer is comparable in size to the cylinder radius. To calibrate the viscometer, the evolution of the inner streaming layer as a function of the oscillation frequency for a liquid of known viscosity is characterized using standard particle tracking techniques. Once calibrated, we show how the steady streaming viscometer can be used to measure low-viscosity liquids.
Original language | English (US) |
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Article number | 041701 |
Journal | Physics of fluids |
Volume | 31 |
Issue number | 4 |
DOIs | |
State | Published - Apr 1 2019 |
ASJC Scopus subject areas
- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes