Cooper Wathen

2025 Team Third

This image shows glycol fog flowing over a 3D-printed jet model inside our homemade wind tunnel. To visualize the airflow, a green dual-planar laser sheet was aligned through the test section, illuminating the leading-edge vortices as they formed along the sharp forebody. The fog traces out tight spiral structures that peel off the nose of the jet and mix into a turbulent wake downstream. This frame was captured on a Canon EOS 2000D, using a still image instead of slow-motion video to freeze the detailed vortex patterns in the laser sheet.

Report

A 0.5 inch diameter droplet of honey slides down a wire at Re=40, exhibiting a classic raindrop shape.

Droplets of honey descend three strands of human hair slowly due to honey’s high viscosity.

A column of dilute milk is momentarily suspended after a child’s toe was suddenly lifted from a pool.

A large droplet transitions from film boiling to nucleate boiling, and the Liedenfrost effect is ended.

High speed video of a firecracker bursting a plastic bag full of water, a can of Red Bull, and a cup of water, filmed at 480 frames per second.

A droplet of water falling into a shallow pool of water rebounds into a Worthington jet.

A droplet splashing into a shallow pool forms a crown shape while the surface reflects a diffraction pattern in the background.

Ball impacting milk.

A stream of mercury impacting a solid surface displays a hydraulic jump.

Laminar flow over a dam in a flume becomes turbulent on impact.