Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [bernoulli]

21 questions
2
votes
0 answers

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
  • 21
  • 1
2
votes
2 answers

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.
  • 368
  • 2
  • 10
2
votes
1 answer

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
  • 725
  • 4
  • 12
1
vote
1 answer

Isn't the Bernoulli equation just a special case of the Steady-flow equation?

This question is about the following two energy balance equations (assuming no energy input/output): Bernoulli: $\frac{p}{\rho} +\frac {v^2}{2} + zg = const.$ Steady-flow: $u +\frac {p}{\rho} +\frac{v^2}{2}+ zg = const.$ So as everyone knows the…
Braden Cutajar
  • 11
  • 1
1
vote
0 answers

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
  • 51
  • 6
1
vote
2 answers

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
  • 111
  • 2
1
vote
1 answer

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
  • 21
  • 2
1
vote
0 answers

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
  • 11
  • 2
1
vote
2 answers

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
  • 131
  • 5
0
votes
1 answer

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
  • 1
  • 1
0
votes
1 answer

How to quantify a misty-ness of a spray?

Picture1 source: Picture2 source: Picture3 source: The above are three spray models. The latter one is fuel injector spray. Consider I have a closed container which I can increase its pressure by any means such by pumping, reduce the volume like…
AirCraft Lover
  • 279
  • 1
  • 9
0
votes
0 answers

why the gage pressure of a fluid is zero at locations where the HGL intersects the fluid?

I have searched for answers to this, but so far I have not found any consistent answers. Please, may anyone help me understand this.
user....
  • 1
  • 1
0
votes
1 answer

Routing the flow from an axial "box" fan

I have a project where I need to generate a certain flow rate to levitate a ping pong ball using the Bernoulli principle. From some rough calculations, I found that it would take about 30 CFM through a 2" diameter hole to lift the ball. The only…
nwsteg
  • 167
  • 6
0
votes
2 answers

Increasing air velocity through F1 car diffuser

I am looking into F1 car aerodynamics for a course that I am taking. I understand that because of Bernoulli's law, when the velocity increases, the pressure decreases, which is good for F1 cars if we want to generate downforce (by having a low…
Spinnaker
  • 1
  • 1
0
votes
1 answer

Pressure variation through reduction (Bernoulli) and pipe wall design

Let's say I have a pipe followed by a reduction and then another smaller diameter pipe continues. Using conservation of mass, the flow through the smaller diameter pipe will have higher velocity. If I apply Bernoulli to this system, while higher…
Rafael Pitta
  • 1
1
2