In this seminar, the FPT team of Master students from University Paris-Saclay will present their work on three problems for the French Physicist’s Tournament (FPT) that involve fluid mechanics. 1. Salty shapes : In some deserts, such as Death Valley, one can see salt polygons that have formed through the evaporation of salty water (https: //physics.aps.org/articles/v16/31). Investigate and explain the phenomenon. Reproduce the phenomenon in the lab. Which two-dimensional pattern can one obtain in such an experiment? What is the size of the smallest polygon you can obtain? 2. PVC cement droplets : PVC cement is a material used in plumbing to solder PVC pipes together. PVC cement droplets have been observed to spin when dropped in water. Explain the physical mechanisms that cause the peculiar motion of the droplets. Study how the shape of the droplets impacts their rotation. Can you create droplets that propel across the water instead of rotating? Maximize their rotational and translational motion. 3. Bubbles under a wet glass : In the right conditions, if a wet glass is turned upside down and put on a flat (but not necessarily polished) surface, air bubbles start appearing in the bottom part of it. Reproduce and explain the phenomenon. Which parameters define the number of bubbles (and lines, in which they aggregate) and their lifetime? Can one make a complete circle of bubbles along the inner wall of the glass? https://secure-web.cisco.com/1e5SlzKVVY70eEQ8r4a0pseC2XJGBdHkBRaY6Zl5iOhA5gARjhsrBcCXyCHngefmyOyXNPEALGJIV-wUoIrFWf0qMSX66_TLaSo-wLxUqS40ldzBDk1rHLAPepmR8KrQiMYZxwCANTpFWLMGs3y8aFH8fGlpVvXvFo1XvFhPORew110ha5vDeHQ5dC6RUiXTwUSN-cqt6f6GFWr6XJBFo1sLU7v5n_LpTs948DJUaYKej6WE5M07CADEkZ6-wRZAaRjQOqty4aBzBq1nr3Y1nkaWDopC6NUJEQXxHo54J2naLd5e26zfWM6EJ7yOJXHjzJG5OsNPEwr9Jk939a-4CQC6RMkWaMfhY1JEDAoWrpCNHnf2WvFjojGHoHjWC8oNERAVcUhBitdaKIGiHAt4Q0AEAhsRHCGYhZbGiFoPPVlw/https%3A%2F%2Fyoutu.be%2F7CIT1KvoUpU
Accès Salle des séminaires FAST-LPTMS (Bât. 530, salle C.120, 1er)