>> ^phyman:

Wonder what this would do for you on a wetsuit...


Not sure, you'd probably be able to swim faster (less drag). Don't know if you'd experience the same level of bouyancy as a non treated wetsuit, although I suspect so. I think bouyancy is related to the weight/density of the object displacing water rather than surface tension holding it aloft ala water spiders.

It's easier to type WITCHCRAFT! Also acceptable: SORCERY!

>> ^juliovega914:

For those of you interested in the actual mechanics of the superhydrophobicity, I direct you to this wiki:
http://en.wikipedia.org/wiki/Lotus_effect
Basically, the reason its so repellent isn't due to a hydrophobic coating, but rather the development of a surface nanostructure that has sharp angles and points in such a way that the surface tension of water binding to the surface is less than the attraction of the dipoles of the water molecule to other water molecules. As a result of this, the water forms globules on the surface rather than running off the side.

For those of you interested in the actual mechanics of the superhydrophobicity, I direct you to this wiki:

http://en.wikipedia.org/wiki/Lotus_effect

Basically, the reason its so repellent isn't due to a hydrophobic coating, but rather the development of a surface nanostructure that has sharp angles and points in such a way that the surface tension of water binding to the surface is less than the attraction of the dipoles of the water molecule to other water molecules. As a result of this, the water forms globules on the surface rather than running off the side.

And they did all this without trying other simple methods of reducing water surface tension, like some kind of detergent, or shampoo? It might have been interesting to see the results, for shits and giggles.

Now I'm trying to remember a bit of comedy I heard a long time ago about using real poo instead of sham(fake) poo.

>> ^charliem:

Hot oil + water = Fire.
That would be a bad idea
Leidenfrost works on the principle of the evaporation point of a fluid on a super hot surface creating a 'steam' (read: gas) interface between the surface and the fluid, for the fluid to float on free of surface tension forces...creating the droplets you see dancing on a hot skillet.
Seeing as oil has no evaporation point, and hot oil and water mix to create fire (the oil is aerosolized by the rapid turning of water to steam, causing it to explode when it gets enough air/fuel mix), I dare say he has dry hands to begin with.
Hes just a freak.
>> ^smooman:
>> ^charliem:
>> ^smooman:
looks like the leidonfrost effect me thinks?

Unlikely. Leidonfrost is the other way around, cold liquids on super hot surfaces.
Besides, oil doesnt have an evaporation point, it has a flashpoint....leidonfrost certainly doesnt apply here.

it would work if his hands were wet? i thought that was a principle of leidenfrost?
if not then one of three things is happening:
1) he has hyper resilient skin in which case he must be studied by science STAT
2) he's a witch in which case BURN HIM
3) jesus, in which case, repent



ya forgot about water and hot oil making fire.

Hot oil + water = Fire.
That would be a bad idea

Leidenfrost works on the principle of the evaporation point of a fluid on a super hot surface creating a 'steam' (read: gas) interface between the surface and the fluid, for the fluid to float on free of surface tension forces...creating the droplets you see dancing on a hot skillet.

Seeing as oil has no evaporation point, and hot oil and water mix to create fire (the oil is aerosolized by the rapid turning of water to steam, causing it to explode when it gets enough air/fuel mix), I dare say he has dry hands to begin with.

Hes just a freak.

>> ^smooman:

>> ^charliem:
>> ^smooman:
looks like the leidonfrost effect me thinks?

Unlikely. Leidonfrost is the other way around, cold liquids on super hot surfaces.
Besides, oil doesnt have an evaporation point, it has a flashpoint....leidonfrost certainly doesnt apply here.

it would work if his hands were wet? i thought that was a principle of leidenfrost?
if not then one of three things is happening:
1) he has hyper resilient skin in which case he must be studied by science STAT
2) he's a witch in which case BURN HIM
3) jesus, in which case, repent

Amazing how they can manipulate the surface tension so much, if that is actually just water. That huge bubble of whatever that ended up on top of them at the end didn't look like water to me though.

Ya beat me IronDwarf.

Yeah, simple surface tension.

It's surface tension: http://dsc.discovery.com/videos/time-warp-water-droplet.html

I wonder, could it break the meniscus and get inside, and then once inside would it be able to break the surface tension to get back out?

Thank you!

In reply to this comment by Throbbin:
That surface tension is pretty neat.

*promote

That surface tension is pretty neat.

*promote

>> ^alizarin:

Oil doesn't evaporate into rainclouds so it can't be "raining" oil unless there was a waterspout (unlikely).


What about if the oil is emulsified with water using dispersants? Don't the dispersants effectively break the surface tension of the oil? What effect does that have on evaporation temperatures?

>> ^westy:

the viscosity of the material seemed wrong. I think liquid texture seemed to have to much of a defuse reflection.
other than that pritty nice .


Agreed; this is one thing I've always noticed with nearly all liquid rendering... the surface is almost always reflects too much light. Perhaps the surface tension simulations just aren't up to par yet? In natural liquid movement I think it tends to be much more disrupted and light absorbing...

Edit: I should also say that I'm not trying to say this isn't still great.

Surface tension FTW!