This tag is for questions relating to Bernoulli equation [named after its discoverer, the Swiss scientist Daniel Bernoulli (1700–1782)], an equation governing fluid flow for an incompressible steady fluid. It gives great insight into the balance between pressure, velocity and elevation. Bernoulli’s equation is a form of the conservation of energy principle.
Questions tagged [bernoulli-equation]
589 questions
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What does the height refer to in the Bernoulli equation?
What does the height refer to in the Bernoulli equation?
I'm trying to determine the pressure on a surface where the length is short enough that the velocity should be constant across it.
Fan -> -8_________________
^-- surface
So,…
Adrian
- 499
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How do you determine the pressure of water at the surface?
Using Bernoulli's equation, how would you determine the pressure of the water at the surface in a vacuum?
I have tried figuring this out and I believe it would be 0pa due to the height of water above being 0m, but this would not make sense using…
zimeg
- 121
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4 answers
Pressure in Bernoulli's Theorem
I am not sure about what does pressure mean in this theorem.Is it the pressure applied by the pipe when the fluid flows in it or something else?Please explain clearly.
Ronak Nahata
- 131
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Can the lift generated by a helicopter be justified using Bernoulli theorem?
When the shaft of the helicopter rotates, it creates a low pressure. Because of the low pressure, the helicopter lifts. Is my understanding that this is just an application of Bernoulli's theorem?
dexterous
- 157
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Use of Bernouli's equation in Water Rocket calculations
In calculating the exit velocity of the water in a water rocket, all the sites I have found use Bernoulli's equation in the rockets frame of reference. I know that that is correct if the rocket was an inertial frame eg being held at rest or moving…
Alan Johnstone
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My curtain is being pulled toward the mesh. Is this due to bernoulli's principle?
When my window is open, the wind from outside blows the curtains into the room, but sometimes after that it's pulled towards the mesh. It doesn't happen every time, so I think this happens randomly. Does this happen when the speed of the wind…
Menna
- 11
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Bernoulli's equation basics
While deriving the Bernoulli's equation, we write the change gravitational potential energy as $mg(h' - h)$ , say where $m$ is the mass and $h'$ and $h$ are the two heights. Why we don't consider the centre of mass in this case? I mean why we don't…
Akash Roy
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What do I need for a good flow of water from a faucet: velocity of water or pressure?
I can't understand one thing. A good flow of water from bath faucet requires a good velocity of water or a good pressure?
For example, I have a crane that has a pipe diameter of 1 inch. The better the flow of water, the higher velocity of water. But…
John Smith
- 121
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1 answer
Bernoulli's theorem
In Bernoulli's theoram as stream lines cannot intersect each other and even water is nearly incomprehensible then how is it possible to all the water which got in come out, eg 100 stream lines goes in from one side then 100 stream lines should come…
user38108
- 11
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How do I apply Bernoulli's equation in a rotating frame of reference?
I intend to apply Bernoulli's equation in an annular swirl flow where v_z is constant, omega_z is dependent on radial location. I need to apply the Bernoulli's equation in a reference frame rotating at an angular velocity of omega_prime. How should…
R R
- 11
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Bernoulli's principle and gases: not matching real-world experience
Bernoulli's principle is said to be applicable to compressible fluids at low mach numbers, with the pressure substituted by pressure potential, which is linear with temperature…
KarenRei
- 111
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Water container on a balance and Bernouilli's principle
Consider a cylindrical water container on a balance. Suppose the water surface is initially at level $h$ above the balance. The pressure at the bottom of the container is then
$$p_i = p_0+\rho g h,$$
where $p_0$ is the atmospheric pressure. Because…
Étienne Bézout
- 659
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How come in these Bernoulli problems, the Pressures on both sides cancel?
If you have an open tank filled with water, and you poke a hole half way down the tank, you can solve for things like the speed of the water coming out of the hole with the Bernoulli's equation, $P_1 + \rho gh + \frac{1}{2}\rho v_1^2=P_2 + \rho gh_2…
hhh
- 329
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How is the Bernoulli's Principle related to a campfire blowpipe?
My uncle recently told me that a campfire blowpipe (It is used to blow air into the fire so that it continues to burn) works on the Bernoulli's Principle. How is it so?
Mriganka Parasar
- 859
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Bernoulli's equation and pressure in a (mostly) sealed container
Let's say that I have a large soda bottle. I drill a small hole through the side of it, put my finger over it to seal the hole, and fill the bottle up with water. When I let go of the hole, water flows out of the hole. The pressure at the top of the…
frypan99
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