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infamous_Q

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- Thread starter infamous_Q
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In summary, the energy stored in a fluid is determined by its total entalphy, which is h_t=e+v^2/2+P/\rho. However, in order to determine the total content of energy of a gas you need a mechanic variable such as velocity and two thermodynamic variables (P,T). If the flow is at low Mach numbers, it is only needed one thermodynamic variable and one mechanic variable because thermal and mechanical states become discoupled.

- #1

infamous_Q

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Engineering news on Phys.org

- #2

Nenad

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use Bernoulis Equation.

[tex] PE = P_{atm} + \rho gh + \frac{1}{2} \rho v^2 [/tex]

Regards,

Nenad

[tex] PE = P_{atm} + \rho gh + \frac{1}{2} \rho v^2 [/tex]

Regards,

Nenad

- #3

infamous_Q

- 99

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Patm...no idea

p = density

g = no idea

h = no idea

v = velocity

thats bad i know..but could you maybe help me fill in the blanks?

- #4

supersix2

- 26

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Patm is Atomspheric Pressure

g is gravity of course

h is height

g is gravity of course

h is height

- #5

FredGarvin

Science Advisor

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In hydraulic systems, one simply uses

Power = p * Q

Where:

p = pressure

Q = Volumetric flow rate

You can do that here, but you'll have some pretty decent errors due to the high compressibility of air vs. hydraulic fluid and availability to do work.

- #6

Clausius2

Science Advisor

Gold Member

- 1,440

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infamous_Q said:

The amount of energy stored by a fluid is its total entalphy:

[tex] h_t=e+v^2/2+P/\rho=c_pT+v^2/2[/tex](J/Kg) in the case of an ideal gas.

In order to determine the total content of energy of a gas you need a mechanic variable such us velocity and two thermodynamic variables (P,T). If the flow is at low Mach numbers, it is only needed one thermodynamic variable and one mechanic variable because thermal and mechanical states become discoupled.

- #7

infamous_Q

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- 0

Air pressure is the force exerted by the weight of air molecules in a given area. It is typically measured in units of pressure such as pounds per square inch (psi) or pascals (Pa), using instruments such as barometers or manometers.

Air pressure plays a critical role in determining the direction and speed of air flow. Air will naturally move from areas of high pressure to areas of low pressure, creating a pressure gradient that drives air flow. The greater the pressure difference, the faster the air will flow.

Air pressure is a key factor in calculating the power generated by air flow. The power generated is directly proportional to the pressure difference and the flow rate of air. This relationship is described by the equation P = Q x ∆P, where P is power, Q is flow rate, and ∆P is pressure difference.

Several factors can impact air pressure and flow in power calculations, including temperature, humidity, altitude, and the physical properties of the air itself. Changes in any of these variables can alter the pressure gradient and affect the resulting power calculations.

Air pressure and flow are used in a wide range of practical applications, including HVAC systems, industrial processes, and transportation systems. In these applications, air pressure and flow calculations are crucial for understanding and optimizing the performance of equipment and systems.

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