# How do fluids behave in a space centrifugal structure (artificial gravity)

• artriant
In summary, In a centrifugal full of a liquid the flow will be slow in the opposite direction of spinning.
artriant
How fluids would act around the circumference of a space centrifugal, where the habitable zones are.

Given that we have a radial gradient of Artificial Gravity , plus Coriolis, inertia, frictions etc. Id expect some change. Will add a list of questions but this more like an open discussion.

• Can we really have the luxury of a completely calm pool or lake?
• In a pipe with liquid going all around the circumference, we would witness flow?
• Do we need to adjust vent hydraulics systems, to prevent unwanted effects?
• Lets also say that we have a roof (unlike Elysium), atmosphere is also a fluid. Is it possible that we would witness a small constant flow of air (if we neglect all frictions obstacles)?
• We also know that mixed fluids separate in centrifugation can you guys imagine a problem caused by that? On a spinning rate < 2 rpm (On our health or a mechanism like for example the standard intake motor)
• Do we expect weird phenomena like steam that go up but slowdown faster? Or anything really weird like steam going down? :p

The Earth has a radial gradient in gravity as well, and we can still have calm ponds and things like that. Obviously the gradient here is smaller than it would be in your example, but that doesn't mean that a fluid at rest would behave qualitatively differently.

russ_watters
Hello boneh3ad. What troubles me is the cause of Coriolis, the gradient also but not so much. Let me give you an example.

In the image bellow we assume that we have our centrifugal full of a liquid let's say water.
The water is completely stable at start. Stable requires particles to move faster on a greater radius to follow exactly the walls (of the construct).

Then we test a big "particle" let's say a ball that can sink.
The ball has some specific linear speed and kinetic energy at the start of sink.

While sinking ball hits faster moving particles.
The ball cannot instantly gain that new linear speed required at this new radius..
The ball gains the speed after a period of time. But while faster particles exchanged that energy, they lost kinetic energy.
So the fast current became already slower.I see the ball as one of the particles. So any movement downwards can cause that.

Faster particles on the other hand that happen to go up will be pushed to slow down .
The water can only be re-stabilized again (gain correct speeds) after friction with the walls of the construct.

Maybe liquids will tend to have a slow flow against the direction of spinning. That`s what i assume.. at least.

## 1. How does artificial gravity work in a space centrifugal structure?

In a space centrifugal structure, artificial gravity is created by rotating the structure at a constant speed. This rotation causes a centrifugal force, which acts as a pseudo-gravity force. Objects within the structure will experience a force pushing them towards the outer edge of the structure, providing the sensation of gravity.

## 2. What types of fluids can be used in a space centrifugal structure to simulate gravity?

Any type of fluid can be used in a space centrifugal structure to simulate gravity, as long as it is able to flow and distribute evenly within the rotating structure. Some commonly used fluids include water, liquid metal, and liquid nitrogen.

## 3. How does fluid behave in a space centrifugal structure compared to on Earth?

In a space centrifugal structure, the behavior of fluid will be different compared to on Earth due to the absence of gravity. Without gravity, fluids will not settle or flow downwards, but instead form a cylindrical shape around the rotating structure. This behavior is known as the "tubular" fluid flow pattern.

## 4. Can fluid be used to create artificial gravity in a space centrifugal structure for humans?

Yes, fluid can be used to create artificial gravity in a space centrifugal structure for humans. By filling the structure with a fluid and rotating it at a constant speed, humans can experience a force similar to Earth's gravity and can live and work comfortably within the structure.

## 5. Are there any challenges or limitations with using fluid in a space centrifugal structure for artificial gravity?

One of the main challenges with using fluid in a space centrifugal structure for artificial gravity is maintaining a constant rotation speed. Any fluctuations in speed can affect the distribution of the fluid and create uneven gravitational forces, causing discomfort for humans inside. Additionally, the weight and volume of the fluid can also pose challenges for launching and maintaining the structure in space.

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