Fuck Yeah Fluid Dynamics

Celebrating the physics of all that flows. Ask a question, submit a post idea or send an email. You can also follow FYFD on Twitter and Google+. FYFD is written by Nicole Sharp, PhD.

Recent Tweets @

Opposing ultrasonic speakers can be used to trap and levitate droplets against gravity using acoustic pressure. Changes to field strength can do things like bring separate objects together or flatten droplets. The squished shape of the droplet is the result of a balance between acoustic pressure trying to flatten the drop and surface tension, which tries to pull the drop into a sphere. If the acoustic field strength changes with a frequency that is a harmonic of the drop’s resonant frequency, the drop will oscillate in a star-like shape dependent on the harmonic. The video above demonstrates this for many harmonic frequencies. It also shows how alterations to the drop’s surface tension (by adding water at 2:19) can trigger the instability. Finally, if the field strength is increased even further, the drop’s behavior becomes chaotic as the acoustic pressure overwhelms surface tension’s ability to hold the drop together. Like all of this week’s videos, this video is a submission to the 2103 Gallery of Fluid Motion. (Video credit: W. Ran and S. Fredericks)

  1. b-o-r-z-a reblogged this from fuckyeahfluiddynamics
  2. alchemisthands reblogged this from cerebrodebulbos
  3. anengineersaspect reblogged this from fuckyeahfluiddynamics
  4. stereokem reblogged this from fuckyeahfluiddynamics
  5. madscientistworld reblogged this from fuckyeahfluiddynamics
  6. ilvarroharra reblogged this from fuckyeahfluiddynamics
  7. raindropinabucket reblogged this from fuckyeahfluiddynamics
  8. slightlyindigo reblogged this from fuckyeahfluiddynamics
  9. rosesgrowfromconcrete reblogged this from fuckyeahfluiddynamics
  10. thatfatboywhosslightlylessfatnow reblogged this from fuckyeahfluiddynamics
  11. 69krishna reblogged this from fuckyeahfluiddynamics
  12. thecdstimes reblogged this from sagansense
  13. agingprostate reblogged this from sagansense
  14. thescienceblog reblogged this from sagansense
  15. pelollipop reblogged this from larkreblogsthings
  16. charcutezero reblogged this from fuckyeahfluiddynamics
  17. biodegradablepsychology reblogged this from lasruinascirculares
  18. fragmentedrecords reblogged this from sagansense
  19. kammartinez reblogged this from sagansense
  20. kodiakkillah reblogged this from elucafiend
  21. elucafiend reblogged this from sagansense
  22. larkreblogsthings reblogged this from somuchscience
  23. lasruinascirculares reblogged this from sagansense
  24. nastassjajssatsan reblogged this from sagansense
  25. zerowasteca reblogged this from sagansense