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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
Published on: March 5, 2014
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Fast imaging technique to study drop impact dynamics of non-Newtonian fluids
Qin Xu1, Ivo Peters2, Sam Wilken1
1Department of Physics, The University of Chicago; James Franck Institute, The University of Chicago.
Journal of Visualized Experiments : Jove
|March 19, 2014
Summary
A new high-speed imaging technique captures microscale fluid dynamics, like drop impacts, with unprecedented temporal and spatial resolution. This method precisely measures fluid flow, spreading, and splashing for non-Newtonian fluids.
Area of Science:
- Fluid mechanics
- Microscale dynamics
- High-speed imaging
Background:
- Observing fast fluid dynamics at microscale is challenging for conventional imaging.
- Drop impacts occur rapidly (within milliseconds) and require high spatial resolution.
Purpose of the Study:
- Introduce a fast imaging technique for microscale fluid dynamics.
- Characterize impact dynamics of non-Newtonian fluids.
- Demonstrate the system's capability for precise measurement.
Main Methods:
- Combined a high-speed camera (up to 1 million frames/sec) with a long-working-distance macro lens.
- Achieved spatial resolution of 10 µm/pixel.
- Analyzed recorded videos to measure flow fields, spreading, and splashing speeds.
Main Results:
- Successfully visualized and quantified the impact dynamics of non-Newtonian fluid droplets.
- Characterized spreading behavior of oxidized liquid metal droplets.
- Determined the onset of splashing for densely packed suspensions.
Conclusions:
- The developed imaging technique offers high temporal and spatial resolution for microscale phenomena.
- Enables precise measurement of fluid dynamic quantities in fast processes.
- Applicable to a wide range of microscale dynamic studies.
