Flow galleria (#2) : Smoke from an Incense stick

-




In this set of images the smoke from an incense stick is seen making a transition from a smooth laminar flow (very close to the incense stick) to a turbulent flow (far away from the incense stick) while passing through the Kelvin-Helmholtz instability (rolling vortices).

Comments

Post a Comment

Popular posts from this blog

The humanity of calculus | Jim Fowler | TEDxColumbus

-
  Imagine if mathematicians were tasked with with teaching Cinderella you know you could imagine that we just say theorem -- Cinderella lived happily ever after every be done with it  you know and that totally misses the point. I mean nobody cares about the happily ever after you know they care about the story. Checkout Jim Fowler's courses on YouTube . They are truly one of a kind.  -- The humanity of calculus | Jim Fowler | TEDxColumbus   
Read more

Communicating and downloading data from the James Webb Space Telescope

-
We use the DSN ([Deep Space Network](https://www.jpl.nasa.gov/missions/dsn)) to communicate with the observatory. We receive data when we have a contact with Webb using a DSN antenna The DSN has three sites around the world, each positioned 120 degrees apart. There are antennas in Goldstone, California; Canberra, Australia; and Madrid, Spain. This allows us to communicate with Webb at any time of day Each of the [DSN complexes](https://www.nasa.gov/directorates/heo/scan/services/networks/deep_space_network/complexes) has different types of antennas, including 70-meter (230-foot in diameter), 34-meter (111-foot in diameter), and 26-meter (85-foot in diameter) antennas. The DSN complexes use the 34-meter antennas to talk with Webb with the 70-meter antennas as a backup. The DSN supports different radio frequency allocations, such as the S-band and Ka-band frequencies that Webb uses. -band has a lower bandwidth, and we use that to send commands to the spacecraft (e.g., start recorder play...
Read more