# Questions tagged [bernoulli-equation]

An equation governing fluid flow for an incompressible steady fluid

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### Finding velocity of air using Hare apparatus (Bernoulli`s principle )

A horizontal stream of air is blown just above the open end of the hares apparatus with an initial speed "V". The density of air is 1.2 kgm-3.Then the water column rises to 6 cm in the respective limb....
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### Can you power a car by using air pressure [closed]

In my fluid mechanics class, I've learned that a fluid traveling in a pipe will generate a force when the exit area is smaller then the entrance area. Suppose a pipe is attached to a car that will use ...
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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 (http://www.cns.gatech....
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### Pumping speed between atmosphere and atmosphere

How to determine flow rate at which air passes through system consisting of an air pump and pipe with a nozzle? In all publications I've found it is important to know the pressure drop, but there's no ...
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### Bernoulli's principle: Why an increase in the section area in a hose makes the pressure increase?

I'm having trouble understanding Bernoulli's principle, in particular, why an increase in the section area of a hose increases the pressure? All the answers I read say: " In order for the energy to ...
1answer
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### Model a fountain

I try to calculate the shape of a fountain under the assumptions of an invscid, incompressible fluid, so Bernoulli is applicable. So the task is to get the evolving shape of a cylindrical waterflow ...
1answer
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### Flow over an indentation

I have a question regarding classical fluid dynamics: I want to describe the shape of fluid flowing over an indentation as shown in grey the figure below. I would like to understand which result is ...
1answer
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### Does air with zero viscosity has effect on the motion of a top-spin ping-pong ball?

Normally (in air with a non-zero viscosity), when I give a ping-pong ball top-spin, the air above the ball tends to decrease in velocity while the air on the downside tends to decrease, resulting in a ...
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### Shape of tank for which water level falls at constant velocity [duplicate]

Greeting, I am working on a problem that involves optimizing the shape of a tank so that the level drops at a constant rate. Problem and my attempt Working on the problem, here is what I know. There ...
2answers
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### Bernoulli equation assumptions (laminar and irrotational flow)

In some books I find that, among the assumptions for proving bernoulli equation using work-energy theorem there are: stationary flow perfect fluid ($\rho=$constant, $\eta=0$) laminar flow But if ...
1answer
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### How to explain rise of the disk?

The situation is as shown above. Now, to explain why the bottom disk rises, I applied Bernoulli's Equation at a point just below and just above the disk.The pressure difference hence obtained should ...
3answers
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### Centrifugal Pump Head

What is pump head? and how is it different from the difference in elevation between the suction and delivery reservoir? Also why must the kinetic energy of the fluid leaving the pump must be least? I ...
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### If a gas in a pipe is travelling from a large cross sectional area to a smaller cross sectional area, will it cool down?

So in a problem like the one in the link below: https://www.youtube.com/watch?v=5W2JgWKiYoU Velocity increases, so pressure must decrease, thus the pressure at the small part of the pipe will be ...
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### Bernoulli equation in leaked pipe

I'm currently trying to figure out how to apply Bernoulli equation into a leaked pipe, especially to find the change of pressure before and after a leak appeared. From what I found know, Bernoulli ...
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### Time to empty conical tank to half of its original height

A hollow cone of height $h$ and diameter $d$ at the base is held with its axis vertical downwards and is filled with water. A small circular hole whose diameter is $1/n$ th that of the diameter of the ...
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### Does increase in dynamic pressure influence temperature growth?

Please imagine a situation where we stir cool water. As far as I remember, this process should increase temperature of the water (faster than heat exchange with air around would do). In essence, by ...
1answer
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### How to calculate pressure loss in a water pipe with a leak?

I'm currently writing a paper on designing a system which can detects if there's a leakage between two certain point of water pipe. I'm using MPX5100 differential pressure sensor as the measurement ...
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### how does it come that atmospheric pressure does not cut off blood flow in blood vessels? [duplicate]

We know that atmospheric pressure is 760mmHg, whereas blood pressure in blood vessels is somewhere between 80 to 120 mmHg. As outer pressure is higher than inner so shouldn't it cut off the blood flow?...