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Related Experiment Video

Updated: Mar 18, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Micro-scale extensional rheometry using hyperbolic converging/diverging channels and jet breakup.

Bavand Keshavarz¹, Gareth H McKinley¹

¹Hatsopoulos Microfluids Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, USA.

Biomicrofluidics

|July 5, 2016

Summary

This summary is machine-generated.

Investigating polymer solution rheology is key for microfluidics and combustion. Jet breakup methods offer advantages over microfluidic channels for measuring extensional viscosity in dilute viscoelastic fluids.

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Published on: February 22, 2018

Area of Science:

Rheology
Fluid Dynamics
Polymer Science

Background:

Elongational rheology of dilute polymer solutions is crucial for applications like microfluidics and fuel combustion.
Quantitative measurement of extensional viscosity in viscoelastic fluids presents a significant challenge.
Advancements in microfluidic devices and imaging techniques are needed for new instrument development.

Purpose of the Study:

To investigate the elongational rheology of dilute polymer solutions using two distinct experimental setups.
To compare the effectiveness of microfluidic contraction/expansion devices versus capillary jet breakup methods.
To develop a dimensionless map for understanding the operating regimes of these instruments.

Main Methods:

Utilized steady pressure-driven flow through a hyperbolic microfluidic contraction/expansion.
Employed capillary-driven breakup of a thin filament from a small diameter jet.
Achieved high deformation rates due to the small length scales of the devices.
Analyzed competing viscous, elastic, inertial, and capillary timescales.

Main Results:

Demonstrated that jet breakup studies can be advantageous over hyperbolic channel measurements in specific low viscosity and elasticity regimes.
Identified conditions where one method offers significant benefits despite implementation complexity.
Constructed a dimensionless operating map based on experimental results and timescale analysis.

Conclusions:

Jet breakup is a powerful technique for studying elongational rheology in dilute polymer solutions.
The developed dimensionless map aids in selecting appropriate experimental methods for specific rheological investigations.
This work contributes to the development of advanced instruments for rheological measurements.