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Acoustics and droplets

Acoustic waves drive oscillatory flows over droplets suspended in air. The coupled pressure and velocity fields around the droplet can enhance its evaporation, revealing a mechanism for fine-tuned evaporation of droplets. Based on experiments conducted in collaboration with Dr. Nir Berdugo and Prof. Dan Liberzon at the Technion, I formulated a simple mathematical model to describe the size evolution of water droplets that evaporate in an acoustic field.

Temperature gradients imposed on an aerosol of volatile droplets can trigger an acoustic instability, followed by spontaneous oscillations of the droplets and air. Collaborating with Prof. Guy Z. Ramon from the Technion, I modelled such instability using a scale separation technique, where the flow around a single droplet was used to deduce the velocity field in the entire aerosol.

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