Vortex Definition and 121 Threads

https://physics.aps.org/articles/v17/117 Small one-quantum magnetic vorticies form in Type 1.5 and 2 superconductors. It was thought that such vorticies would confine the non-superconducting electrons inside them. This experiment shows that this is not the case. The vortex can move for the...

So I just had a question. In a Netflix documentary, they showed these people trying to simulate the conditions of a black hole by having a vortex in a pool of water. they said that light cannot pass through the hole and the physics around is essentially adjacent to the event horizon and what...

I cracked an egg into water and it sank implying the egg matter is average more dense than water. If this is the case, a vortex should force the egg (when on the surface) off to the edges via the difference in centripetal force. Why then does the egg stay in the center when the water is swirling?

Ref: https://s3.wp.wsu.edu/uploads/sites/44/2015/12/VortexTubeOptimizationTheory.pdf The above paper says that the initial separation of hot and cold air is complete once the flow is partly deflected backwards at the left hand side (HOT) end. See Fig. 1 in the paper. It also says that the...

Mathologer made a cool video recently about "Tesla's Vortex", or rather a cool method of generating patterns using repeated multiplication and modulus to generate repeating sequences, and then plotting those sequences around a circle. This creates cardiods and other related patterns, a different...

What do you think of purifying water by using a vortex / law of gravity? Here is what I am thinking: 1. Build a funnel-like jar, clog it on the bottom and fill the jar with water. Now wait for several hours. 2. Unclog the bottom, wait for a few seconds (depending on the size of the jar) and...

Can anyone tell me what are those vortex lattices in Bose-Einstein condensates (BEC)? Images of these vortex lattices in BEC can be seen here http://www.iap.tu-darmstadt.de/fileadmin/apq/apq_teaching/apq_teaching_ws1213/GESPERRT_moderne_optik/Ketterle_Vortex_Lattices_Science.pdf. Are those...

I have an interesting(IMHO) approach to explaining how the vortex tube works. There are a few explanations on wiki, but not a simple and convincing final one. https://en.wikipedia.org/wiki/Vortex_tube Normally a vortex tube, that runs well, howls very loud. It is a kind of aerodynamically...

... And if it won't form spontaneously with reversed flow, then will a vortex at least sustain itself once we nudge it in one direction?

https://d2r55xnwy6nx47.cloudfront.net/uploads/2020/09/0903_TurbulenceBlobs_Dolphins-1920x1080.mp4 From, https://www.quantamagazine.org/an-unexpected-twist-lights-up-the-secrets-of-turbulence-20200903/

Hi there, I'm very stuck on this problem when approaching it like this. I know I could use the Landau Criterion for rotons but that's not accepted here, it wants the approach to come from the uncertainty principle. My thinking is along these lines: There will be a change in chemical potential...

In free vortex what does it mean " non-trivial component of velocity vector is tangential"? I know only the tangential component of velocity exists in free vortex flow, so what happens at the eye of the vortex ( what happens to vorticity and streamlines to be specific)?

I am curious if it would be possible to put a quartz crystal at the bottom of strong cylinder vial with half the crystal hanging out the bottom (but sealed) and have mercury on top of it and then pressurized if it would create a constant vortex? If the mechanical force of the pressure from the...

I am aware of the equation of the velocity of a forced vortex, which is simply ## v = r\omega ##. However, the velocity for a free vortex is ## v = \frac{c}{r} ## (## c ## is the 'circulation constant', ## r ## is the radius, ## v ## is the velocity and ## \omega ## is the angular velocity). I...

In: "Fluid Dynamics", Chapter 3 (Turbulence), Section 26, Landau and Lifchitz analyze the problem of the stability of a steady flow past a body of finite size. The fluid is assumed to be incompressible and they reach the conclusion that perturbations that deviate from steady flows start to...

Suppose a fluid passes from having laminar flow, to having a turbulent flow (like when passing after an object). How do fluid speed and fluid density change after that?

Suppose you have a spherical cavity, with a flow of a fluid ( in particular water), entering it from one side. What will happen to this flow? Will it create turbulences? Will speed increase? Will eventual waves entering the cavity be reflected, so creating waves with bigger amplitude? Suppose...

in this link here you can see the hot exhaust temperature and cold exhaust temperature at different ratio (hot to cold) with input air/gas at different pressure level. I want to discuss the top here i.e. the data where the input air/gas is at 20 PSIG pressure. You can see that with a 80:20 ratio...

I hope many here know about vortex tube and its application. I myself have done some study but were unable to find one answer. If we know the speed of the inlet fluid, then how can the angular velocity of the fluid during its rotational motion can be determined.

I have read a few parts in various papers where they refer to tiltered vortex lines in superconductor vortexes, however it is not clear what these lines really mean physically. Can anyone suggest a source or a description to this? Thanks

I don't care whether it goes clockwise or anticlockwise so this is not the usual Coriolis conversation. Why doesn't it just go down straight?

So, drag vs downforce on race cars is the equation. We all know vg's will help airplanes from stalling by keeping the air attached past the point of stall. At stall the air has no (?) major drag? (This is a question). So let's say your race car has a flat bottom, front splitter and a rear...

let's say you have a street legal racecar, flat front splitter with undertray going back to front tire stock undercarriage with crooked exhaust and couplings and then a badass rear difuser from the rear tire to the bumper. Let's keep this about "under the car" question. Vortex generators do some...

So, i just started an elementar study on hidrodynamics and I'm stuck with something. We have that the circulation in a closed path Γ is given by: ##C_Γ=\oint_Γ \vec v⋅\vec {dl}## And that, in a irrotational flow, ##C_Γ = 0## for any given Γ. But if we have an irrotational vortex wouldn't...

Homework Statement The compressible inviscid vorticity convection equation: $$\frac{D(\frac{w}{\rho})}{Dt}=(\frac{w}{\rho})\cdot \nabla U + \frac{1}{\rho}\nabla P \times \nabla (\frac{1}{\rho})$$ differs from the incompressible version in two important ways : 1) The convected quantity is...

We all are more or less familiar with the performance of vortex tubes regarding how they can make hot and cold flow by pressurised and/or air/gas at high speed. What I am wondering is the performance of saturated steam inside vortex tube. As for example, suppose we are using saturated steam at...

Hello, I used the Darcy Friction Factor from the Moody Diagram along with the Reynolds number to find energy losses inside the cold air tubing of our vortex system. My calculations showed that I should decrease transitions, length, diameter, and velocity. I am mainly concerned with the figuring...

I hope most here are familiar with vortex tube i.e. Ranque-Hilsch tube. I just want to guess if humid air used. We can get some idea about functionality of vortex tube from this http://www.airtx.com/how-does-a-vortex-tube-work.htm. Now take the example for the lowest pressure level mentioned in...

I'm currently struggling slightly with finding some information regarding a vortex. If I have a fluid in a cylindrical container and the fluid is then rotated at a constant speed, the vortex will displace the water and raise it relative to the initial level of the fluid. Is there any formula...

Hello everybody. I am currently doing some research about the evolution of ozone holes over antartica. I am interested in 2002's season, since strong winds from the stratosphere managed to alter the wind's clockwise circulation about the continent making it one of the weirdest recorded. So...

The problem statement Example 1 A single particle I have a particle being forced by a radial centripetal force onto a smaller radius $$l_1=m_c.v_1.r_1$$ $$L_1=L_2$$ $$L_2=m_c.v_2.r_2$$ $$m_c.v_1.r_1=m_c.v_2.r_2$$ $$v_1.r_1=v_2.r_2$$ $$v_2=v_1\frac{r_2}{r_1}$$ Its increase from ##v_1## to...

Hello everyone, I am not an expert in the topic so I apologize in advance if the question has an easy answer. I think it is well known that if we have a set of N vortices in a superfluid their mutual interaction is logarithmic. Meaning that if \vec x_n is the position of the n-th vortex, then...

If you look at this YouTube video you will see an example of a ring vortex made by a dolphin (there are quite a few other examples). The problem is I can't understand why the ring doesn't immediately float to the surface. Only when it breaks up do the bubbles rise. The ring appears to...

I set up two canister vacuum cleaners facing each other: I had the idea that if there was some circulation in the air (provided by the small fan) then a vortex would form between the inlets. This does not seem to work. I don't have much knowledge or intuition about aerodynamics. Would this...

I am trying to understand what forces keep a free vortex, (i.e. a vortex ring). Its rotating particles must have a force to avoid them going out (like gravity on planets). I have read about vortices and vorticity, but get lost in equations. Is it possible to explain the force that keep the...

Hello all, I have been attempting to perform the iterative procedure outlined in McCormic's textbook (1995) for the vortex theory of propellers. However, I have become stumped when attempting to get tangential velocity relative to tip speed after the first iteration as a part of the equation is...

Hey everyone, I'm new to the Physics Forum, so this is my first post. I heard somewhere that the Sun moves through space at a certain velocity. If that is true, then wouldn't the Solar System be a system of vortex motion, and not simply gravity being a centripetal force holding the planets...

For an airplane, their are multiple types of lift, camber, angle of attack, pressure difference, and vortex lift. I understand that at the end of wings the low pressure at the top, and high pressure on the bottom causes their to be a vortex formed. My question is, how exactly do they use that...

Today I learned how easy it is to create and visualize toroidal vortices in a swimming pool. I bet this could be done in a bathtub. Do moving submarines create a big toroidal vortex around themselves?

In 1958, chemical operator Cecil Kelley was killed by a nuclear excursion in a mixing tank. A tank intended to reprocess trace amounts of dissolved plutonium-239 accidentally had dramatically more radioactive material dumped into it. The plutonium, being dissolved in a lower-density fluid than...

Homework Statement Using Kelvin’s circulation theorem, find the qualitative and quantitative relation between the circulation around an airfoil and the circulation of the starting vortex. Homework Equations Kelvin's circulation theorem: DΓ/Dt=0 The Attempt at a Solution I don't really know...

If atmospheric pressure hot and cold air are sent into the opposing sides of a vortex tube (the ports normally used for gas outlet), will compressed air be generated/released from the hole/port normally used for gas input? The reverse of the system above (cold and hot air enter from opposing...

Need help with an application I am thinking of. In this application just 10 cubic inches per second of cold air is needed, that too for 2-5 seconds only. Also, not a lot of cooling/heating capacity is needed, just 30C of air cooling should be sufficient. How would we construct such a device? I...

Hi Guys, Please excuse my ignorance. I was wondering about the physics involved in the vortex created by using a stirrer bar in a beaker of water. Is this Bernoulli's Principle, of balancing speeds and pressures? And does the resistance offered by the sidewall of the beaker completely change...

Homework Statement Hello, Do you know how to find Lagrangian for 2D Vortices? Homework EquationsThe Attempt at a Solution

So i just had a thought. A rotating object creates a small but identifiable vortex in space-time. I would imagine that the faster the object rotates, the more drastic the vortex becomes. My question is, if you were to have a massive object rotate very fast, at near the speed of light, how does...

So I was reading about Vortices in Wikipedia, when I stumbled upon the explanation about Irrotational Vortices. It states there that in Irrotational vortices, the fluid's flow velocity u, is inversely proportional to the distance r, from the vortex's axis. Then, at the end of the...

kindly help me with a detailed explanation?

if you have a reference for someone with a semester of thermo (as opposed to a grad student with 3 semesters), a link would be appreciated . meanwhile, a quick question: temperature, as determined by one of its factors for gases, translational kinetic energy, follows a Planck distribution. but...

Hey guys, I'm actually working on a project of gravitational vortex turbine at an undergrad level. I need to know the energy or the energy required to make a stable free vortex in a cylinder. The cylinder is of 1 m height and 1.5 m diameter. A channel of 0.5 m width is connected to the...