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Related Experiment Video

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Published on: March 30, 2017

Asymmetric oscillations during phase separation under continuous cooling: A simple model.

Yumino Hayase¹, Mika Kobayashi, Doris Vollmer

¹Max Planck Institute for Polymer Research, 55128 Mainz, Germany. hayase@mpip-mainz.mpg.de

The Journal of Chemical Physics

|December 3, 2008

Summary

This summary is machine-generated.

This study models binary mixture phase separation during cooling, revealing oscillatory turbidity. The cooling rate dependence of oscillation periods aligns with experimental findings, enhancing understanding of fluid dynamics.

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Area of Science:

Physical Chemistry
Materials Science
Fluid Dynamics

Background:

Phase separation in binary mixtures is crucial for material properties.
Continuous cooling can induce complex phase behaviors.
Gravity's influence on droplet dynamics during phase separation is significant.

Purpose of the Study:

To investigate binary mixture phase separation under continuous cooling.
To incorporate the effects of gravity and droplet sedimentation into a phase separation model.
To analyze the resulting turbidity variations and their dependence on composition and cooling rate.

Main Methods:

Utilized the Cahn-Hilliard equation to model phase separation.
Incorporated gravity effects by simulating instantaneous removal of droplets exceeding a maximum size.
Analyzed the oscillatory behavior of turbidity in symmetric and asymmetric phase separation scenarios.

Main Results:

The model predicts oscillatory variations in turbidity.
Observed both symmetric (both phases oscillate) and asymmetric (one phase oscillates) oscillation patterns.
In asymmetric cases, sedimentation from the majority to the minority phase inhibits droplet formation in the minority phase.

Conclusions:

The developed model successfully captures the oscillatory turbidity during phase separation.
Sedimentation plays a key role in modulating phase separation dynamics, especially in asymmetric compositions.
The predicted cooling rate dependence of oscillation periods shows good agreement with experimental data.