Water droplets on a surface. Half of the surface is hydrophobic.
Colored water droplets on a glass surface made superhydrophobic by condensed soot. David Leng
Colored water droplets on a glass surface made superhydrophobic by condensed soot. David Leng
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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
- Particle Physics: Flow and Light
- Particles 2: Aerosols
- Particles 3: In Water - Under Construction
- Art and Science
- TOC and Zotpress test
- Photons, Wavelength and Color
26 Comments. Leave new
Very interesting, this sounded like a pretty easy and affordable way to make a superhydrophobic surface! There were a couple seminars a few weeks ago that talked about similar experimentation which got me interested in the topic, but they made it sound pretty difficult to make superhydrophobic surfaces. I really like your artistic effects also. Great idea to incorporate an untreated section of glass but the main focus is on the droplets in the hydophobic area, including a couple large red droplets (which looks like beads from Mancala) and smaller black droplets with the matte isopropyl soot on them.
The interesting aspect of this image is to be able to compare the behavior of the water on the hydrophobic and untreated surfaces. Unfortunately the top down view and clearly focused carpet in the background detracts from the artistic appeal of the image and makes it more of experimental result documentation in my opinion. I’m also not sure that the plane of focus is at the optical location.
I like that you can compare the two surfaces (I wished that I had a picture like that for mine). Maybe consider editing out the light spots, they are a little distracting. I like the angle this was taken from.
I like the intent to show the hydrophobic versus not on the surface as apposed to having a more artistic view. The whole surface is in good focus and you can really see the fluid phenomena
i like how you showed the contrast between the two different surfaces. Great job capturing this photo!
I think the idea of showing the hydrophobic and nonhydrophobic side is cool but looks a little offputting aesthetically. Love that you can see the soot on the droplets, it looks very cool. I love the angle this was taken from. Bright droplets are a great contrast with grey background.
Great photo, very interesting to see how some of the droplets have a well bounded shape while some don’t have the surface tension to hold their weight. I like the range of colors and reflections
I really like the lighting of the water droplets. They illuminate the droplets very well. It might be worth looking at cropping the photo a little towards the more in focus part.
Like the comparison between the hydrophobic side and the uncoated surface. You are really able to see the difference between the two. Very cool.
Showing the contrast between the hydrophobic vs non-treated side offers a unique perspective that helps illustrate the effect being documented. You mentioned that you wanted to focus on the background more than the foreground. I may have tweaked the aperture to experiment with the depth of field. If this was the intent, I still like it.
Cool separation between the hydrophobic and non. I like the difference that this exemplifies in the phenomenon. The angle of the plate is also cool, and the rough background against the smooth droplets is a good contrast. The location does have a lot of distracting light and scenery reflections.
I like seeing the difference between the surfaces. The colors are good. The lighting is great but the focus is a bit high.
Art: The color contrast between the background and the color water droplets is really well done.
Flow: The flow is quickly understandable and recognized.
Photographic technique: The focus on the closer water droplets could be better, but the depth of field is well done with the variation of fields.
displaying the difference between the two surfaces in interesting. The light reflection off the glass surface is distracting. Maybe a different backdrop would have made the image pop out a bit more.
I like the comparison between the hydrophobic side an the regular side of the glass. interesting to show the quick transition of how the droplets interact with the surface.
Art: Pleasing colors
Flow: Really interesting showing the non-hydrophobic vs hydrophobic
Technique: I’d bring focus more towards middle of image
1. Artistically very nice.
2. The fluid physics are well shown.
3. The photographic technique is good.
Very creative experiment, I like the way you include both the hydrophobic and none hydrophobic surface. It gives the viewer a good idea of the experiment at hand.
Great technique to create hydrophobic surface. Really like how only half of the surface was coated so you can capture both isolated droplets and ones that are less defined.
Interesting difference between the hydrophobic and non hydrophobic surface. Also the line created by the soot adds a nice effect. However maybe try to crop out the surface the glass is on it is a bit distracting.
I like how you show the difference between the hydrophobic surface and the regular surface. It’s cool to see how the property of the surface can really change how the fluid will act.
It’s cool to see the difference between the hydrophobic surface and the normal glass. This photo is really nice for answering the questions presented by Sierra’s photo. Good lighting and colors.
Great focus and detail. I like the use of a different angle to see more droplets. I like how you compared the different surfaces and how they contributed to how the droplets formed.
Great display of flow. The image has great contrast. I like how there is a separation between the hydrophobic surface and the normal surface such that the physics can be clearly seen.
You captured a really cool phenomenon and did a good job of showing how the hydrophobic surface changes the way the drops sit. I do think you could have put some more thought into the composition of the image, it looks like you just snapped a random shot standing there rather than setting up a shot with care.
– Great photo, it is interesting to see the droplets go from a more round shape to less distinct round shape.
– It looks like towards the bottom it is less hydrophobic which adds another element to the overall picture.