This photo shows a cold, density-driven flow created by dry ice sublimating in water. As it spreads, instabilities generate eddies and turbulence. The fog then sinks and hugs the surface, forming a gravity current.
Haiying Peng
Categories
Flow Vis Guidebook
- Introduction to the Guidebook
- Overview 1: Phenomena. Why Does It Look Like That?
- Overview 2: Visualization Techniques
- Overview 3: Lighting
- Overview 4 - Photography A: Composition and Studio Workflow
- Overview 4 - Photography B: Cameras
- Overview 4 - Photography C: Lenses - Focal Length
- Overview 4 - Photography C: Lenses - Aperture and DOF
- Overview 4: Photography D: Exposure
- Overview 4 - Photography E - Resolution
- Overview 5 - Post-Processing
- Clouds 1: Names
- Clouds 2: Why Are There Clouds? Lift Mechanism 1: Instability
- Clouds 3: Skew - T and Instability
- Clouds 4: Clouds in Unstable Atmosphere
- Clouds 5: Lift Mechanism 2 - Orographics
- Clouds 6: Lift Mechanism 3 - Weather Systems
- Boundary Techniques - Introduction
- Dye Techniques 1 - Do Not Disturb
- Dye Techniques 2 - High Visibility
- Dye Techniques 3 - Light Emitting Fluids
- Refractive Index Techniques 1: Liquid Surfaces
- Refractive Index Techniques 2: Shadowgraphy and Schlieren
- Particles 1- Physics: Flow and Light
- Particles 2: Aerosols
- Particles 3: In Water
- Particles 4 -Dilute Particle Techniques
- Art and Science
- TOC and Zotpress test
- Photons, Wavelength and Color
3 Comments. Leave new
I appreciate how you slanted the entire base surface so the flow would go to one side due to gravity. I would be interested/curious to see iterations of this experiment with a variety of slant angles of the base. I love the sharp focus on the flow pouring out of the beaker.
Neutral Question: Would it be possible to add a dye to the fog at all? And if so, how could you do it and what would it change?
Honestly, I gave it a try, but I could only dye the liquid. The smoke itself doesn’t change color. Cuz, dry ice fog is basically make up of tiny droplets of condensed water vapor, and they don’t pick up the dye from the water. To create a colored fog effect, one might use colored lighting use a different kind of smoke that’s already colored. Good point, I may try this in the future.