Dear Colleague,
The Physical Review Journal Club returns October 23 with an exclusive conversation with author Antonio Chahine (Institut de Mecanique des Fluides de Toulouse) discussing a series of experiments published in Physical Review Fluids and summarized in Physics Magazine showing that airflow triggers surface waves that cause droplets to crawl like caterpillars before they break apart.
The team placed a 40-to-100-µL glycerin droplet on a horizontal glass surface in a wind tunnel blowing at 20 m/s (equivalent to a gale on the Beaufort scale). At first, the airflow across the droplet's surface caused the droplet to extend into an oval shape. The droplet also began to tilt, with the liquid piling up at the droplet's downwind edge. When the drag force exerted by the airflow overcame the capillary force between the glycerin and the glass, the droplet began to slide and to stretch out even more. Surface waves then developed on the elongated droplet and traveled toward its leading edge. The waves induced a stable caterpillar-like motion, with the droplet stretching and contracting along its length. Eventually, beyond a threshold length that depended on the droplet's volume, the caterpillar was no longer able to withstand the shearing force and broke into several droplets.
The researchers say that the behavior follows the same pattern as that of an elongated droplet sliding along an incline. The information adds a new component to describing how droplets transport and distribute materials along surfaces.
After a brief presentation from Chahine, there will be a question-and-answer session open to all attendees moderated by PRFluids Editorial Board Member Arezoo Ardekani, Purdue University.
Registration is free and a video recording will be provided to all registrants.
When:
October 23, 2023 11:30 a.m. ET
The paper under discussion:
Caterpillar like motion of droplet in a shear flow
A. Chahine, J. Sebilleau, R. Mathis, and D. Legendre
Phys. Rev. Fluids 8, 093601 | The session will be moderated by:
Arezoo Ardekani, Purdue University
The Physical Review Journal Club events are live, interactive events allowing early-career scientists to discuss the latest published advances in physics with leaders in the field. There will be a short presentation, followed by an interactive session where the participating author will answer your questions. This is a rare opportunity to engage with the authors of important research developments in an "Ask Me Anything" format. During this interactive portion of the Journal Club, participants will be allowed to have their camera and microphone on and are encouraged to join in open discussion with the presenters.
Please feel free to share this information with your institution and colleagues. Registration is free, and a video recording will be distributed to all registrants at the conclusion of the event. | | | |
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