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Rapid Spreading of Yield-Stress Liquids
Surjyasish Mitra1, A-Reum Kim2, Boxin Zhao2
1Micro & Nano-Scale Transport Laboratory, Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 10, 2024
Summary
The spreading of yield-stress liquids like hydrogels and blood is governed by their high shear rate viscosity. This viscosity determines whether spreading follows an inertia-capillary or viscous-capillary regime, impacting biomaterial ink applications.
Area of Science:
- Fluid dynamics
- Rheology
- Materials science
Background:
- Liquid drop spreading is driven by surface tension.
- Newtonian liquid spreading dynamics depend on inertia or viscosity.
- Yield-stress liquids exhibit unique flow behaviors.
Purpose of the Study:
- Investigate early spreading regimes of yield-stress liquids.
- Determine the influence of yield stress on spreading dynamics.
- Provide insights for controlling biomaterial ink printing.
Main Methods:
- Conducted spreading experiments with hydrogels and blood.
- Varied the yield stress of the tested liquids.
- Analyzed the power-law evolution of the dynamic spreading radius.
Main Results:
- Early spreading of yield-stress liquids is dictated by high shear rate viscosity.
- Low high shear rate viscosity leads to an inertia-capillary regime (exponent 1/2).
- Increasing high shear rate viscosity results in a viscous-capillary regime.
Conclusions:
- High shear rate viscosity is the primary factor in yield-stress liquid spreading.
- Spreading dynamics transition from inertia-capillary to viscous-capillary with increasing viscosity.
- Findings aid in controlling moving contact lines for precise biomaterial printing.
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