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Updated: May 6, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Rayleigh wave scattering from sessile droplets.

R Quintero¹, F Simonetti

¹School of Aerospace Systems, University of Cincinnati, Cincinnati, Ohio 45221, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|November 16, 2013

Summary

This summary is machine-generated.

Researchers discovered a new way surface acoustic waves (SAW) interact with droplets in microfluidic devices. This finding, involving quasi-Stoneley waves, could enable ultrasonic measurement of surface tension.

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Area of Science:

Physics
Materials Science
Microfluidics

Background:

Surface acoustic waves (SAW) are crucial for droplet manipulation in microfluidic devices.
Leaky Rayleigh waves are the primary understood mechanism for SAW-droplet interaction.
Droplet behavior in SAW devices is complex and requires further investigation.

Purpose of the Study:

To investigate an additional interaction mechanism between SAW and droplets.
To explore the role of quasi-Stoneley waves in sessile droplets on substrates.
To correlate droplet properties with ultrasonic signals for potential surface tension measurement.

Main Methods:

Three-dimensional finite element simulations were employed.
Ultrasonic scattering experiments were conducted.
Rayleigh wave reflection from droplets of varying diameters was measured.
Real-time monitoring of droplet evaporation was performed.

Main Results:

Evidence for quasi-Stoneley wave propagation within sessile droplets was found.
The energy of Stoneley waves is confined to the fluid-substrate interface.
A correlation between droplet contact angle and reflected Rayleigh signal spectra was observed.

Conclusions:

Quasi-Stoneley waves represent an additional SAW-droplet interaction mechanism.
This mechanism offers potential for non-contact ultrasonic measurement of droplet surface tension.
The findings advance understanding of microfluidic droplet dynamics.