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Related Experiment Video

Updated: May 14, 2026

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

Drop formation in non-Newtonian fluids.

Mounir Aytouna¹, Jose Paredes, Noushine Shahidzadeh-Bonn

¹Soft Matter Group, Van der Waals-Zeeman Institute, IoP, Science Park 904, Amsterdam, Netherlands.

Physical Review Letters

|February 5, 2013

Summary

This study reveals that fluid pinch-off dynamics are similar for yield stress and shear thinning fluids, similar to Newtonian liquids. Shear thinning in flow does not necessarily mean thinning in elongational flow.

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Area of Science:

Fluid Dynamics
Rheology
Non-Newtonian Fluids

Background:

Droplet pinch-off is a critical phenomenon in various industrial processes.
Understanding the behavior of non-Newtonian fluids during pinch-off is essential for process optimization.
Yield stress and shear thinning are two key non-Newtonian characteristics that can influence fluid dynamics.

Purpose of the Study:

To investigate the pinch-off dynamics of yield stress and shear thinning fluids.
To differentiate the effects of yield stress and shear thinning on droplet breakup.
To compare the pinch-off behavior of these fluids with Newtonian liquids.

Main Methods:

Utilized a tunable yield stress material to isolate yield stress effects.
Employed a shear thinning system (without yield stress) to control shear thinning behavior.
Analyzed pinch-off dynamics under controlled rheological conditions.

Main Results:

Pinch-off dynamics for both yield stress and shear thinning fluids closely resemble those of constant viscosity Newtonian liquids.
The study found that shear thinning in a fluid does not automatically translate to thinning in elongational flow.
Tunable rheological properties allowed for clear separation of fluid effects.

Conclusions:

The fundamental mechanism of pinch-off appears robust across different non-Newtonian fluid types studied.
Shear flow behavior is not a direct predictor of elongational flow behavior for these fluids.
Further research into elongational rheology is needed for accurate modeling of complex fluids.