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Ultrasound Velocity Measurement in a Liquid Metal Electrode

Ultrasound Velocity Measurement in a Liquid Metal Electrode

Published on: August 5, 2015

Pattern selection and regulation using noise in a liquid metal.

Pawan Kumar¹, J M Cruz¹, P Parmananda¹

¹Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India.

Physical Review. E

|May 22, 2019

Summary

Researchers observed shape transitions in liquid mercury using noise. Stochastic resonance drove changes between irregular, triangular, and elliptical patterns, demonstrating noise-induced pattern selection in liquid metals.

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Area of Science:

Physics
Materials Science
Fluid Dynamics

Background:

Electric fields can control liquid metal shapes.
Understanding shape transitions is key for materials processing and microfluidics.

Purpose of the Study:

To investigate noise-induced shape transitions in liquid mercury.
To observe stochastic resonance phenomena in liquid metal pattern formation.

Main Methods:

Utilized biased white noise to regulate mercury droplet patterns.
Experimentally induced transitions between irregular, triangular, and elliptical shapes.
Employed cross-correlation analysis to confirm periodic stochastic resonance.

Main Results:

Observed irregular (I) to triangular (T) to irregular (I) pattern transitions with increasing noise amplitude.
Observed irregular (I) to elliptical (E) to irregular (I) pattern transitions.
Demonstrated a stochastic resonance-like effect driving structural changes.

Conclusions:

Noise can be used to select and regulate the shape of liquid metals.
Stochastic resonance plays a role in the structural transitions of liquid mercury.
The findings offer insights into controlling liquid metal behavior via external stimuli.