The Barus Effect

[Matrix29bear]

1:02 - Now my bladder is giving me false alarms.

[galaxyknight55]

wow i just got a science lesson in like 1 min and 19 seconds while i had to listern to my teacher in science class for 1 hour...

[Porrly]

Barus, like 'Barometer'?

[shannonluzchris]

i have to pee now

[Trollioli]

I've got the weirdest boner right now.

[AndromedaChao2]

So as the polymers in that non newtonian fluid enter the orifice, they are stretched due to tensile stresses as the flow rate is increased, but upon exiting the orifice, they assume their original shape that they had before entering the orifice causing the diameter of the fluid stream to dilate laterally, is that right?

[3BricksHigher]

1st!

[ayakowakumi]

aaaaahhhhhhhhhh. didnt think my bladder cud hold much longer.

[ricktbdgc]

the weissenberg effect kicks the barus effects ass

[Maxence1402a]

No pissing !

[noexamples]

This video made me have to pee!

[skanky87]

Thumbs down.

[MrBANANAHEAD68]

0:55 thumbs up is you had to piss after this...

[Nabo00o]

@MrBANANAHEAD68

Piss blood? No thank you!

[SuckMyCockx]

/watch?v=1COTZm6J0AU

[RexshaTheOneAndOnly]

:58 anyone else feel the need to pee



[Peopleunit]

And this my friends, explains how Santa Claus is able to squish down your chimney and emerge from the bottom, unsquished.

[TheKarlez]

thats interesting...

[threewheelsbetter]

makes me gotta tinkle

[ilikebooty00]

wtf? someone better not have gotten a nobel prize for discovering this

[RandomGal555556]

are you sure that's a syringe?

also, i've seen this work for paint and soap...so do they follow this effect too ?

[Dyonivan]

@RandomGal555556

A syringe is simply the tube that liquid is put in that you can also force out using a vacuum system. Most people are only familiar with the medical syringes with needles on the end.

[caneboia]

when we wil appreciate a video called "the psidot effect" ? :D:D

[lasertracer206]

its not really boring....u just dnt no the concept of science!

[mieczyslawru]

it makes me want to peee  :(

[BoorhZwah]

cooooooooooooooooooooooooooooo­ooooooooooooooooooooooool



[JAKEooTHEooRIPPER]

wtf??? waste of time

[frikken20]

so if you drink this will you pee it out

[1freak1015]

yea thanks for making me have to pee

[gmc07joe]

Thanks now I have to piss

[Rand0mzify]

YOur about to see the "I'm-gonna-digitally-punch-thi­s-person-cuz-this-was-boring-e­ffect.

[danielcarmi305]

oooooooooooo............. dripping water...... how can this get any cooler?!?!

[bananasquads]

when i piss it comes out like that cos mah dick so baig.

[Ryukushinn]

i know how the effect reacts but i dont know how to explain it not even a word

[lRandomnessMess]

that stuff looks yummy

[Dragonspirit999]

yes u will die swell

[fremag123vif]

Die swell = dies well

[ChaomPR]

@fremag123vif maybe die aswell?

[PoisoningOrchid]

wtf?

[HEARTbreaker959]

wow ur so smart lol good vid =)

[supergsx]

i gotta go take a leak

[James1toknow]

he places more pressure on the fist Item and because it has a denser state you get the BS effect. this is why you don't over pressure hydraulic fluids,, they can explode.

[Tardis1217]

I'll swell insode your orifice. I'll expel a liquid stream, too

[casanoval33t]

i piss the same color :(

[0987zxcv0987]

hahahahaha thats so nasty hahahahahaha

[pathosbedlam]

The first liquid took 20 seconds to exit and the water 14 seconds or so. Was the amount of liquid the same? If so, it's kind of weird if the fluid exiting the tube is wider and goes for longer as it should be more volume. unless it is creating an empty space inside the liquid stream. Let me know.

[PwnerBalooner]

um u seem 2 know wat the hell this video is about can u plese explain just a bit plese? thanks.

[pathosbedlam]

In extrusion, the swelling of an extrudate to a dimension larger than the corresponding dimension of the die. It is caused by changes in stress which occur in viscoelastic polymer melts as they emerge from a die. That's the dictionary meaning, but it makes less sense than the video. Basically the polymer liquid gets slightly stuck to the tip as it exits, flinging it outwards making the bulge we see as the Barus effect. Water on the other hand doesn't get stuck. Gelatinise water and it will.

[orochno2]

@pathosbedlam

It's not about being stuck at the tip. This effect, causing a maximum

swelling of 13% for inelastic Newtonian fluids, has got two extra contributions

for viscoelalstic fluids. Based on energy elasticity and entropy elasticity.

The former one consists of compression of the fluid in the die, in the direction

perpendicular to the flow, followed by an expansion when the fluids comes

out of the die.

The latter one consists of orientation of the polymer chains

[orochno2]

@orochno2

...due to elongational flow (the convergence at the exit, from the reservoir to the die)

and due to shearing (due to friction with the walls of the die)

This orientation, once elongational and shear forces are no more present, will induce a return to a non-oriented state,

due to natural increase of the entropy. This will cause a 'curling' of the chains

who were stretched in the flow direction, causing them to shrink in the flow

direction, expand in the direction perpendicular

[criscros7]

Have you read the video description?

[feki00]

0:57 oh shi.. i need to pee

[smudge6699]

Simple and to the point, nice.

I'd seen this happen but didn't know it had a name.

[bygota]

very good explanation!

[truman890]

u shoulda made sumthin explode after my god barus musta been a dickhead

[JakkHack]

Please die.

[truman890]

lol. no.

[bjrnrkssn]

"die swell" lol

[bcallfree]

gel for hair have the same effect?

[criptlordwc]

Must find!!! PORN!!!

[greig747]

lol same

[PhilAndFrankShow]

rule 34 ftw

[KekkeiGenkai3]

Ok, now I have to go to the restroom.

[muhlange]

Being a chemical engineer, after learning and experimenting about fluid properties (which is a bitch to learn), I kinda appreciate this vid...lol

[thedude2190]

more like the boring effect

[ringwormts115]

who da fuck cums up wit dese stupid names , like Barus n photons n issac newton , its all a load of cookoo at da end of da day

[Genocideontheweb]

my god how basic, how boring, hats off sir, way to go.

[mrurkraft]

loll

[oldboystef]

The "bore-us effect" HO!

[sparks12001]

you clever devil....

[sscottrell]

goods one

[cuteboymimmi]

haha lol! it makes us bored!

[AudioRawr]

haha

[usurper70]

@oldboystef

oh ye silver tongue

[JeraldAnAlcaholcMoos]

wow your pretty stupid

[ItsThatGuy8669]

And that comment is coming from the person that uses the word "your" incorrectly. You meant to use the contraction "you're".

[JeraldAnAlcaholcMoos]

lol its youtube who really cares? and that guy was being a dick

[radar77377]

YOU looks prett y fuckin dumb

[kosmosleha]

I'm not an expert in this science, but it looks like a bottle of shampoo empteed out.

[kibnib]

I am no physics expert, so please don't quote me on this...

I contend that any solution with a high enough surface tension will exhibit the barus effect. Applying pressure to the solution against the orifice causes the solution to expand in different directions as when it escapes. The solution reaches its widest point when gravity takes over, and begins to fall.

I don't what calculations are necessary to predict how wide the solution is when it exits.

[BlueBajs]

Wikipedia ftw.

[johndoe528]

the second half of this makes me have to pee

[nodestudio]

Why does this happen? Is it because a) the syringe is compressing the thick polymer, then it's expanding as soon as it exits, or b) is it surface tension clinging to the outside edge of the syringe opening, or.. c) is it because of friction making the fluid exit the syringe faster in the center and more slowly on the outside? Or is it something else?

[johndoe528]

option a

[hermexhermex]

Impressive swelling of the orifice stream, indeed.

[lorialyse83]

How the hell did I manage to come across this video???

[elackowazze]

interesting...thanks for the vid

[send2id]

this made me go pee

[nodestudio]

me too, but wider than usual...

[Hardysamnin]

rofl

[mastermckay13]

arent we all?

[inglishspeeker]

I hate it when I get a swelling of my solution stream.

Especially when it is several times larger than the diameter of the orifice.

[ilovedaddyverymuch]

i dont get it?

oh yea they use

a medicine tube

[54spiritedwill54]

Wow. Lots of big words. Cool vid

[BlizzardT1]

not really that awesome>.>

[BigCityJonas]

Awesome!

[blackhawkrising]

the force appied in squeezing the seringe compresses the polymer, giving it a smaller volume. when it exits the tip, it expands back to it's normal density

[mastercane090293]

no way if it wasnt or this guy i wouldnt ever know that water will spill from the botle....

[Dhragonfly]

interesting..

[JOELAB1020]

kinda like when i take a shit.

[TehMikstPinoy]

OMG dude you made me laugh

[sammiluvsnaruto]

XD! Now I have to pee..:)

[EVCarolina]

The pressure applied does not appear to be constant. Perhaps it is not necessary to demonstrate the effect. Thanks for posting.

[PHDinkickingyourass]

should be called the bogus effect

[Kasbm]

Why?

[thechsn1420]

made me wanna pee

[Asdam12]

It makes me wonder why these people put their videos on YouTube... hehe

[bbjml1995]

i dunno maby for a school assignment or something, but if not for that i guess it is pointless

[Asdam12]

I was just joking about that.

[bbjml1995]

o srry

[tacinmesa]

that last one made me have to go pee

[lilaznmidgetdude]

ITS ALIIIVE!!

[ClaudiaSwann]

hey 'thanx you for wasting blah blah' people.

your the one you youtube 'wasting your life'

watchign this stuff you dont like.

so why dnt you stfu + gtfo

and let us people who are interested not have to see your retard comments. heh

[Onyxsonic]

"heh" doesnt make you cooler plus this stuff is actually pretty interesting.

[ClaudiaSwann]

i dont expect it to.

its just how i roll.

habit of saying heh.

and i knw this stuff is awsome.

hence my comment ^^

[F00dTube]

I agree, you just want to grab em and whack em around a bit sometimes. The title isn't misleading. They choose to watch video. Also these type of comments tend to clutter and ruin a social website.

[Onyxsonic]

oh sorry =/

[ClaudiaSwann]

Lol s'all good ^-^

[babyfacesin]

lol at 56 it sounds like som1 went

[kungfoolai]

yea it dose lol

[rasellersjr]

heheh I'd have to agree. I was watching and my wife in the other room poked her head in and asked what the hell are you watchin!? Aside of that, great demonstration.

[0x7F800000]

what a contrast:

such a short & understandable definition of an interesting physical effect, and so many rude retards replying to it ;(

[ricksullivan]

You didn't watch the video if you think nothing happened. The stream of liquid expanded and took on several shapes other than expected. Intuitive thinking would have said that the liquid would have been narrow and at best assumed a vortex shape. This video shows a counter-intuitive effect. The liquid stream actually became larger in diameter. Sigh, the dumbing down effect I quess was in action among some of the viewers.

[Stan50]

What? Nothing happened.

He just poured shit out of a syringe.

[Jawsh196]

OMG stupid people complaing that this wasted time of their lives... who cares? :D

[waccamaster]

blabedy blahbedy blah blah blah yawn

[12zxz21]

thank you for wasting 1:18 of my life i feel like praising you

[friteza88]

Can i have my 1.18 back please ?

[jdjdjd1hotmailde]

you've wasted 1.18 minutes of my life

[OGMO11]

DIE swell... lol xD (no, im not referring to any medical issues (for example cancer) dont wanna start a useless debate here)

[ProffiKillerin]

Lol

[bar3247]

cool now I have to PEE!!! thanks alot..

[m133573333]

polymers, melts?

i havent noticed any barus effect in my fajita melt, except now that i think about it, can poo exhibit the barus effect?

yeah that sounds right, "go easy on the fajita melt, you dont wanna know what barus effect poo is like!"

[poopspeedstream]

i really gotta go now.

[cabron8000]

waht is the point of this bauraus effect? does it cuase us humans harm??? should we be worried the nex time some kid in preschool uses glue??

no... then shut the fuck up

[possosso]

r u stupid? its an effct it dosent do anything, it wasnt invented to have a point its an effect

[teraconna]

WOAH dont fucking surprise me like that!

[LTN64o]

I need to go  pie after that last part ..

[zonumb]

You need a slice of pie? Funny, all i had to do was take a piss

[wctje777]

i think he ment pie .. xD

[maltiveru]

simple demonstration but very good and explainable. Nice...keep it up.

[bugQ]

This happens with many glues, which are elastic, I presume.

[iowaatheist]

Crap, now I have to pee.

[voiceofopinion]

Wow. Lots of big words. Cool vid, though!

[cornbreadmaster]

cooooolll!!!!! not

[x0lacrossechic0x]

maybe the fluid is pressurized and it expands when it hits the low-pressure air, and since its so elastic, it moves slower than water would and would build up faster than water, and it would become wide before gravity pulls it to the ground.

[chrism216]

i think its because the elasticity of the fluid is so high that when it comes out, it makes a "drop", only its so elastic that it doesnt acctually interrupt the flow, but it just gets thicker...

again... i think

[Allthenamestaken87]

thats true, nice videos psidot :)

[stephkd]

No wonder you havent had any comments, I could do this with friggin dish soap and water!!!!!!!!!!!!!...........a­nd it sucks

[psidot]

Well let us see it then.

[jperelli]

but could you explain the behavior of the fluids before watching the video?

They explain this with simple stuff so suckers like you can understand

(sorry my bad english, i'm from Argentina)

[poopspeedstream]

i'm guessing the video wasn't made to impress people, it was probably made to display the Barus effect.