All Questions
Tagged with equilibrium fluid-dynamics
22
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46
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Water level in pipe higher than surrounding body of water
I had a question about water pressures and level. We've recently drilled a near vertical hole underground 130m deep by 400mm in Dia into flooded lower underground workings as part of a de-watering ...
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51
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How to calculate equilibrium time for a communicating vessel with height difference?
The scenario is that a communicating vessel or a U tube without lids is filled with water. There is a height difference between the two pipes of this tube. Then there will be hydraulic pressure and ...
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50
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Intravenous therapy - why does blood come out of my body once the fluid is depleted? [closed]
The other day I wasn't feeling so well so I visited a doctor. He recommended that I take a break and get intravenous therapy so I did. I laid on a bed and the nurse inserted a needle into my left arm ...
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Deriving Non-linear acoustic wave models, equilibrium state assumption
The standard derivation in obtaining a single wave equation involves making use of the heat equation with a Taylor expansion of the equation of state, then differentiating this equation and the ...
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2
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Is the existence of hydrostatic relativistic objects a coincidence or inevitable?
Neutron stars are unique in the universe because their sizes are just slightly bigger than their Schwarzschild radii. Because their sizes are comparable with their Schwarzschild radii, the nonlinear ...
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4
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1
answer
246
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What is ferrofluid shape in zero gravity?
Will it have any kind of spikes? When a magnetic field is applied to a spherical ferrofluid droplet, will it just pull the droplet toward the field as a whole? Or will it do so by creating and pulling ...
- 41
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1
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39
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Defining local equilibrium within a fluid splited in elementary volumes
I have been staring a paragraph of my fluid mechanics book for a long time and would like to ask to the community here how I could understand the meaning of $\delta A$, $\nabla A$ and $\bar A$ in this ...
user343933
2
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2
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825
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Necessary and Sufficient Conditions for an Equilibrium to be Stable
In the 4th section The condition that convection be absent of the book Fluid Mechanics by Landau and Lifshitz, they give the following statement:
For the (mechanical) equilibrium to be stable, it is ...
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240
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2 connected tubes filled with water, placing a stopper in one and raising the other, how can I determine pressure exerted onto the stopper?
If I have two 20ml test tubes connected at the base via a thinner flexible U-shape tube and I pour a set amount of water (40ml) into one test tube whilst both are at level height, the water ...
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2
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450
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Variation of atmospheric pressure with depth in U-tube
In my physics book "Fundamentals of Physics" by Jearl Walker there is a figure that shows a U-tube with uniform cross-sectional area. The U-tube contains two liquids in static equilibrium: ...
- 105
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2
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397
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Pascal's Law, When does pressure equal out?
I've been looking into how hydraulic lifts work and i don't quite understand yet how Pressure and Forces relate. Let's assume the water is on equal level on both sides and i apply a force to The ...
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3
votes
1
answer
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Is temperature equilibrium actually reached in a mixer tap, or is it merely a jumbling of hot/cold droplets?
Most kitchen and bathroom sink faucets have a mixer tap which blends the hot and cold inflows into a warm, uniform outflow stream. It's difficult to believe that complete heat transfer and ...
- 1,043
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168
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Why does the Rayleigh-Taylor instability growth rate increase with wave number?
It can be easily derived that the Rayleigh-Taylor instability growth rate on the boundary of two fluids (i.e. denser fluid supported by a lighter fluid) under gravity, $g$, is given by $gk\eta$, where ...
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1
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How should the hydrostatic equation be set up for the sun? [closed]
Beforehand I Solved the hydrostatic equilibrium for the sun with constant density. I am then asked with finding the density as a function of the radius, and evaluate what it will do to the ...
3
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1
answer
592
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What does "equilibrium under its own gravity" mean for a body of fluid?
A spherical body of radius $R$ consists of a fluid of constant density and is in equilibrium under its own gravity. If $P(r)$ is the pressure at $r(r < R)$, then the correct option(s) is(are)?
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