Authors: Team Kohlrabi – Hannah DelGuercio, Peter Jakubczak, Sam Lippincott, Kenneth Olavarria

Team Plan: The plan for our “Team First” assignment is to use a seeded medium (smoke from a smoke machine in air) to photograph the turbulent airflow generated by the smoke machine itself. We plan on using a green laser as lighting to better visualize the flow patterns generated. We predict that the smoke generated will rapidly become turbulent after leaving the machine. This is likely due to the fact that the distances traveled by the smoke in the freestream air will be quite substantial, and cause it to trip to turbulence rather rapidly.

Setup: We shot a series of photographs in an unoccupied room in the engineering center. This room proved to be dark enough for us to effectively capture the interaction between the smoke and the laser. The smoke machine was placed perpendicular to a laser beam, and the laser beam was projected onto a black velvet tarp hung from a rail. This allowed enough contrast for us to see the laser interacting with the smoke machine.

Setup Photo:

Photo: The featured image is an edited photo I took with my Canon EOS Rebel T7. I made it black and white to reduce the intense green shine produced by the laser. Human eyes are also most sensitive to green wavelengths of light, so hopefully reducing all the green will allow us to see more details in the flow.

Report:

Settings:

Camera: Canon EOS Rebel T7

Lens: Canon EF-S 18-55mm Macro

Aperture: f/3.5

Exposure: 1/13

Focal length: 20mm

Focus distance: 0.67m

ISO: 6400