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Roberto Zenit
Registrace 23. 02. 2008
This channel shows videos of some research projects of the Rheology Lab at the Instituto de Investigaciones en Materiales of the Universidad Nacional Autonoma de Mexico. All video are about fluid mechanics phenomena; there is some emphasis on non Newtonian fluid mechanics. Enjoy!
Swimming at small Re
This video describes the mechanics of swimming in viscous environments.
zhlédnutí: 413
Video
The pearls of mezcal
zhlédnutí 2KPřed 8 lety
This was our 2014 entry to the Gallery of Fluids Motion. We study why surface bubbles have a particularly long life time for mezcal. Great fun!
Painting with flying viscous catenaries: Pollock's recipe
zhlédnutí 2,7KPřed 8 lety
This is our entry for the 2015 Gallery of Fluid Motion. It shows the experiments conducted to understand how certain features of 'Mural' (Pollock, 1943) were painted.
Juggling with fluids
zhlédnutí 824Před 10 lety
This is an entry to the Gallery of Fluid Motion of the 66th Annual Meeting of the DFD-APS to take place in Pittsburg in November of 2013. The video shows that you can use a fluid jet to juggle a light ball. It's great fun. You should try it!
The formation of an emulsion
zhlédnutí 4,1KPřed 10 lety
This video shows how a viscous fluid breaks into droplets inside a stirred tank to form an emulsion.
Bubbles forming in a packed bed of particles
zhlédnutí 440Před 10 lety
This video shows how bubbles form and move inside a packed bed of particles. We used index-matched particles to see through the bed.
Water drops in hot oil
zhlédnutí 45KPřed 10 lety
This video shows the explosive behavior of water drops in hot oil, filmed with a high speed camera.
Droplets bouncing over a vibrating fluid layer
zhlédnutí 1,9KPřed 11 lety
This video shows the motion of levitated liquid droplets. The levitation is produced by the vertical vibration of a liquid container. We made visualizations of the motion of many droplets to study the formation of clusters and their stability.
Breakup of the tail of a bubble in a non-Newtonian fluid
zhlédnutí 3,5KPřed 11 lety
We study the shapes of air bubbles ascending in non Newtonian fluids. For certain conditions, the tail adopts unexpected geometries. This video was selected to appear in the Gallery of Fluids motion (Soto, E., Zenit, R. and Manero, O. Break up of the tail of a bubble in a non Newtonian fluid. Physics of Fluids,20, 091110, 2008)
Rodless Weissenberg effect
zhlédnutí 9KPřed 11 lety
This video shows a well-known effect in viscoelastic flows: the rod-climbing (or Weissenberg) effect. We reproduced this flow without the need of a rod; the fluid climbs onto itself! It is a nice demonstration of the effect of viscoelasticty in a simple flow.
The rebound of a viscoelastic particle
zhlédnutí 661Před 11 lety
In this video we demonstrate the concept of viscoelasticity, an intermediate behaviour between a viscous fluids and an elastic solid. We throw gelatin particles against a wall and observe.
Siqueiros accidental painting technique
zhlédnutí 582KPřed 11 lety
This is an entry for the Gallery of Fluid Motion of the 65th Annual Meeting of the APS-DFD (fluid dynamics video). This video shows an analysis of the 'accidental painting' technique developed by D.A. Siqueiros, a famous Mexican muralist. We reproduced the technique that he used: pouring layers of paint of different colors on top of each other. We found that the layers mix, creating aesthetical...
Has anyone ever tried this with another non-volatile liquid such as ethylene glycol? What is causing the light flashes?
i got a droplet to bounce in a vibrating cocacola 2 liter bottle in my idling ford explorer ;) got it on video but im sure i deleted it long ago. maybe try that as a material if you want a dark liquid for some reason...maybe it was the soap that basically all drinks contain these days..can always see a rainbow sheen in sodas these days.
How interesting the physics of fluid acrylic pouring. The viscosity will definitely create a really great velocity of flow. Thx very informative 👍🏻😊
,v.
How do you make a viscous acrylic or oil paint to paint like this?
Muchas gracias!
garbage
Look at you .. making painting mathematical and less funn ! haha
It looks fantastic! I liked your limited use of colour. I tried it too (see video), with some variations.
Isn't this what everybody seems to be doing now a days in you Tube?
I think this demo is quite incomplete - seeing as you don't mention at all what kind of paint this is....
Roberto, are you so in admiration of yourself that you cannot be bothered to reply to anyone on here who has given their time to watch this vid? People have watched this and are asking questions. Don't believe you are so wonderful that you don't need to reply.
I don't understand your message. I have, in numerous occasions, replied to questions. Please read below. The paints are cellulose nitrate lacquers.
Great to look at but absolutely useless on information. What kind of paint...what everything???????????????? how annoying
Lovely to watch ~ And I like how you presented the information in a more scientific approach sketched out in the video. Sorry for your father's passing ~ Blessings
which paints we should try to obtain this effect/?
this tells me that dark is light, and light is heavy.
Right because the white is titanium and is heavier.
hey Roberto what do u mean by high raynold number in layman's language..?
Hi. Thanks for asking. The Reynolds number measures te relative importance of speed effect with respect to viscosity effect. So, high Reynolds means either high speed or low fluid viscosity (one can achieve high Re by increasing the speed of the brush or by decreasing the viscosity of the media). In this case, the sorrounding fluid is air, which viscosity cannot be changed easily. So, in summary, for this case, increasing Reynlds means moving the brush faster. Enjoy experimenting.
To anyone wondering how to achieve the effect: Ink (The same you can find for pens) & acrylic does work. It's kinda mindblowing to see everything bubble itself. Acrylic for markers are really efficient too. Pouring a blend of white spirit & oil paint into it does makes some cool effects too. It spreads out naturally of the pouring area.
Ludovic Delespierre hey....is it colour specific? as in shd the ink be black and the acrylic be white or something? and which other colour combinations cd bring the same effect?
My attempt was in Blue ink with Orange Acrylic. I guess it's all about experimentation.
Ludovic Delespierre yes i agree its all about setting ur hand at something...did u use acrylic ink or alcohol based ink...? tonight i plan to do some tests lets see how they turn out....
Hello to everyone. Thanks for the comments. The effect is achieved if a dense paint is placed in top of a less dense one. Generally, bright paints tend to be denser (because white paint, which is used fro brightness contains Titanum Oxide particles which are heavy). Dark paints are generally less dense (black paint is made with Carbon black particles, which are not particularly heavy). We have achieved this same effect for Red over Black, Yellow over transparent, and of course, White over Black. We have see the effect for both lacquers and oil-based paints. One thing to keep in mind is that, since oil-based paints dry very slowly, you may see the effect appearing but if the paint does not dry up the texture will continue to evolve and be lost. Have fun. Roberto
+Shivali Misra I used a water based acrylic used to refill markers (Montana to name a brand). Good luck with your attempt!
Awesome video, I if you were to make one with just paint flowing, (no words) I bet lots of people would love it, because it actually has a very calming effect, and the video in itself would be a piece of art! It's mesmerizing to watch..
Thanks
Do you think artists like nancy wood and arthur brouthers are incorporating this technique into their artwork ?
She is using acetate & acrylic. So it might be the same process.
If Art is what we save, this fits within the category of Found Art, or Scientific Art where one with an eye for aesthetically pleasing compositional elements handpicks or frames certain selected portions, whether from radar images or geological maps or aerial photos, etc. The kinship some of these have with microscope slides or other nature photos suggest the relationship between cell growth and spread of dissimilar fluid mixes, ie mathematical expansion or some such formula. This is the raw material, which unless rigorously culled to refine more structure, composition, or is manually re-manipulated, all becomes generic, perhaps pleasant, but without focus and lacking a critical aspect of intention which leaves the final product vague and unsatisfying.
Yes. But acrylic pours can be done that, though producing accidental effects, ARE influenced by the artist, who has to make many choices. Each choice can ruin or glorify the painting. There is WAAAAAAYYYY more to fluid painting techniques AS ART than are even hinted at here. This is the fluid painting equivalent of being trained as a chef by being told all you have to learn is fry eggs. I am with you in finding accidental techniques alone as not producing consistently satisfying pieces of art...unless I misunderstood you?
Nice work, Roberto!
Excelente explicación
I've tried this with acrylic paint and it didnt work. I had thinned down the bottom layer of paint with water and kept the top layer paint thicker. But the top paint just sat on top. Any tips?
Dear Benny....look up MelyD and check out her technique!!!
I think equal viscosities is the key. Thick hansa yellow 10G...a very light gravity pigment...will sink right through a thin layer of white. Try making the layers the same viscosity. As with anything, experimentation is the key.
Dfynomax; exactly the opposite. The heavier or more dense always sinks down threw the lighter less dense. Of course all colors must be the same viscosity. Wish I had a way to determine each individual paint's relative specific gravity to each other. Ex. We all know titanium white is the heaviest.
Check out Suave Arts CZcams channel. She manipulated densities to achieve cells. Many many videos
@@oldasa there are charts online for many brands, which list pigment densities or weights, from heaviest to lightest; or could be sorted into order if not. for fluid acrylic painting, the substrate or polymer which holds the pigments, ie the ''paints'' themselves, that needs to be mixed (with medium) seperately, to an Equal runniness, equal Viscosity, so it can ''flow'', and get the reactions. thicker paint viscosity will interfere with the movement of the other layers or colors.. it's the ''density'' or ''heaviness'' of the pigments themselves, not the substrate holding them, which causes the sinking or rising per se :)
is this an oil based process?
+el Flaco 66 for the video we used cellulose Nitrate lacquers. But it could be done with oil based paints. The problem with them is that such paints dry very slowly, so you may not be able to capture the effect.
And so oils don't work.
Wow, enserio lo hicieron así. Está genial Yo también quiero hacerlo
Starting @ 1:30, I want that on my SUV! That is just awesome.
wonderful. I'm working on vibration of micro-droplets on flat surfaces and studying the contact angle variation during the process.
Hello there Robert!!I too would love to jump on the bandwagon and request an email with the paper please! Thank you SO much! truthbetold22@hotmail.com
My father was Siqueiros' assistant in Mexico City. His name was Jack Hooper, he died last year. He always referred to this technique he learned to perfect as "sgraffito," and said they achieved it by painting layers and then slice off the surface revealing the layers below....This makes sense as it seems like it would be challenging to pour layers of wet paint on a wall without them running to the ground.
Is this oil or acrylic?
Had a question about this from a friend. I had a lot of words which, in the end, were unneccessary, had he seen this film. Thanks for uploading these very beautiful images of an exploding drop of water.
Dear Subscribers: A formal article describes in detail this investigation has finally appeared in the journal PLOS ONE: journals.plos.org/plosone/article?id=10.1371/journal.pone.0126135 Thank you all for your kind and constructive comments. With best wishes Roberto
What kind of paint is used for this technique?
Thanks for this. I'll try it out on the city I'm painting.
all abstracts look like accidental.
What paint u have used? ???
Hi
I think, the painting looks better when is wet than dry. I think the movement gives an awesome effect. Perhaps, it stills beeing a good tecnique!! thankss
Do u mix the paint with the lacquer If so what are the measurement please thank u so much
I would love to know about the paint u use please more info thank u
WoW, thats beautiful!
Dear Friends: Thank you for all your comments about this video. Please find the first short article about this in: dx.doi.org/10.1063/1.4894196 There is another long detailed article that will appear soon. I will send you the link when it comes out. Best Roberto
Anyone tried this? What kind of paint did you use?
what type of paints are used? acrylics or other? thanks colleen
I was wondering the same thing. If I had to guess, I would definitely say they used acrylics.
Just found this farther down in the comments section. "Hi again. We have used acrylic lacquers made by Sherwin Williams. The product line is called Opex. It is kind of hard to find (in Mexico, where we are). We are nearly finished writing a paper where the process is described in detail. When it's finished I'll be happy to share it with whomever wants it. Cheers."
V3N0M607 Hi I would love to be sent a copy. It is driving me nuts how to get the finish I want. many thanks Wendy
+ V3N0M607
Wtf? Whenever I go to another vid of water marbling I see Kearney's comments
Very cool research, it inspired me to make this video although I can only film up to 1200fps Water in Boiling Oil
a form of marbling?
Hello Robert , you wrote : "We are nearly finished writing a paper where the process is described in detail. When it's finished I'll be happy to share it with whomever wants it. Cheers." Can you please tell me where to find this paper u have written?
Hi. The paper was submitted to a journal and is currently being refereed. If you send me your email, I'll be happy to send it to you, with the understanding that it cannot be widely distributed quite yet. SaludosRoberto
HI Lauren. Please send me your email. I will send you the document.
Roberto Zenit Any chance I could get a copy of your paper? Would love to try this method. I guess I'm a dork because I can't figure out how to find your email address to private-message you. haha My email address is "tgthornhill at sbcglobal.net"
Bonjour , avez vous eu une réponse concernant cette technique par différence de densité ?. Mon adresse Email. blaiseb51@gmail.com.
Hi Roberto... I'd love a copy too if you don't mind. I'd really like to try it out myself! Thanks for the info. And the amazing video!! Bob.Iroquois @ gmail dot com Thanks again!
very good