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Adsorption-Mediated Mass Streaming in a Standing Acoustic Wave.
Oren Weltsch1, Avshalom Offner1, Dan Liberzon1
1Nancy and Stephen Grand Technion Energy Program and Department of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Physical Review Letters
|July 1, 2017
Summary
Acoustic waves create a directed flow in gas mixtures, moving specific components towards surfaces. This sound-induced flux, observed in air-water vapor, could enable novel separation technologies.
Area of Science:
- Fluid dynamics
- Acoustics
- Physical chemistry
Background:
- Oscillating flows can lead to time-averaged mass transport.
- Acoustic waves interact with concentration gradients in gas mixtures.
Purpose of the Study:
- To investigate the generation of a time-averaged flux by acoustic waves in a gas mixture with a reactive component.
- To experimentally measure and model this sound-induced preferential flux.
Main Methods:
- Generation of a standing acoustic wave in a gas mixture.
- Experimental measurement of component flux towards an adsorbent-coated boundary.
- Development and application of an approximate theoretical model.
Main Results:
- A significant, time-averaged preferential flux of a reactive component was observed.
- The flux is a nonlinear result of oscillating velocity and concentration fields.
- The experimental results showed good agreement with the approximate model.
Conclusions:
- Standing acoustic waves can induce a directed flux of reactive components in gas mixtures.
- This phenomenon is driven by the interaction between acoustic fields and sorption processes.
- The findings suggest potential applications in gas separation technologies.
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