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Questions tagged [bernoulli]

28 questions
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Theory of rotationally symmetric air cushion vehicle

I am trying to develop a theory for this situation: A small blown-up balloon is attached to the center of a compact disc; you let it float as the balloon discharges. Simplifying assumptions: rotational symmetry, cushion has constant thickness t,…
r4r4
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Help calculating discharge rate from a reservoir as the water level drops?

I could do with some help calculating the discharge rate from a reservoir and factoring in how that flow will decrease as the head of water decreases. The information I have is: Maximum height of water in the reservoir is: 10.52m Diameter of the…
Sean
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If a gas is pushed through a widening section of a pipe with a piston, will the pressure increase?

Imagine I have a section of pipe that increases in cross-section at some point. If the gas in the pipe before this section is being displaced with a piston, will the gas increase its pressure and reduce its velocity while going through increasing…
Francis L.
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Limits of Euler-Bernoulli Beam Theory for Wide Plate in Flexure?

I'm looking for established limits or rules of thumb for the validity/accuracy of Euler-Bernoulli beam equations for particularly wide "beams". For example, a simply supported rectangular plate where the breadth(b) is much larger than the height (h)…
willpower2727
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Calculating Pressure Drop from Water Pipe Discharging to Atmosphere

I have an application at work where I am draining a water tank. The outlet valve is a flush mount, and I know the Cv value from manufacturer website. I can calculate the pressure drop through this valve and piping. The piping goes to an atmospheric…
remusconnor
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Efflux velocity for system with air and liquid

I want to calculate the efflux velocity for this open vessel with area $A_1$ with a small outlet with area $A_2$ as a function of time. The atmospheric pressure is $p_0$. The vessel has height $h = h_{air} + h_{fluid}$ and is filled with a fluid. I…
Wim Nevelsteen
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Can I dismiss wind loads for this solar panel configuration?

I asked this question before in the Physics Stack Exchange, but it was closed because it was considered being about engineering. That is why I am asking it here. I am planning to install some solar panels on a flat floor. They must be inclined to…
Claudio Saspinski
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Venturi Duct flow

When water flows through the converging side of a Venturi, why is it that the total head (experimental and calculated) is not constant? Could it be due to losses? Also, why was it that a lot more total head was lost when the fluid came out of the…
Ranulph teeee
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Bernoulli head losses

For a Venturi, I calculated total head theoretically and experimentally. I noticed that the last point along the Venturi has not got the same as the start point total head? Shouldn’t it be the same due to Conservation of energy?
Emmanuel
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Bernoulli equation on moving cart

Let’s say I have moving cart with velocity U . And water from pipe flows at velocity V with respect to ground The question asks to use Bernoulli equation , pressure is atmospheric in the top If I use Bernoulli equation relative to the cart I get…
Mather
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Does high-pressure liquid flow exhibit choked behavior or velocity reversal when increasing outlet area beyond a certain point?

I'm running a SolidWorks Flow Simulation for a high-pressure liquid (water) system. The inlet pressure is 15,000 psi, and the outlet is atmospheric (14.5 psi). I observed something counterintuitive: When increasing the outlet area, the velocity at…
Atomic science
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Difficulty in understanding the trigonometry in applying the momentum equation for a stream tube

As far as I can understand the sum of the applied forces is the component of the weight of the fluid in the s direction and pressure forces. Looking at the diagram it seems the component of Fg is Fg/sin(θ). Because, sin(θ) = Opposite side /…
engman
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Velocity value in a pipe junction when we're applying the energy equation

I'm trying to understand how to apply the energy equation at a junction of 3 pipes. For example, when we are considering points A and D, should we consider that velocity at point D just before the fluid entres the junction (that is, there are 3…
Simion I.
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Can a fluid have more or less static pressure than atmospheric pressure in atmosphere?

We assume static pressure of a fluid coming out of a pipe or nozzle of gas turbine with high temperature and velocity is equal to atmospheric pressure, which confuses me for some point. Does it mean that a fluid in atmosphere can not have more or…
Jawel7
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Find pressure, given 2 velocities at open end of pipe and inside pipe, at different elevations

There is a tube travelling horizontally, 8m below the ground, with a diameter 15cm. It then turns upwards and at a height of 1.75m above the ground, it shoots water out with a velocity 32 m/s. Find the pressure inside pipe. Consider water to be an…
Shiven Agarwal
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