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Old Jan 28th 2015, 09:22 AM   #1
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Energy of water flow in a channel

Hey guys,

I have a channel of 0.5 meter width and depth of 0.5 meter as well. The water is being pumped into the channel by a pump having Max Head (22.5 meter) and Max flow rate (500 L/min). The connection between the pump and the channel is by means of a pipe of 2 inch(0.0508 meter) dia.

I need to calculate the energy of water flow in the channel.

Any help would be appreciated.

Thanks.

Last edited by pheonixrider; Jan 28th 2015 at 10:29 AM.
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Old Jan 28th 2015, 09:47 AM   #2
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I assume you are only concerned here with mechanical energy, not thermal energy, correct? Because strictly speaking the energy in a fluid flow includes its enthalpy. I also assume that the channel is level, and the rate of flow of the water in it is constant. In this case the energy in the flow is (1/2)rho v^2, where rho is the density of water. The units of this in energy (Joules) per cubic meter. So all you need do is calculate the velocity of flow. Given the flow rate of 500 L/min you can convert that to m^3/min, and divide by the cross-section area of the channel to get velocity of water in the channel.
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Old Jan 28th 2015, 11:37 AM   #3
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Thank you for your response.
Yes, only concerned with the mechanical energy.

So basically, we have used,
Volumetric flow rate = Velocity x Area

Calculated velocity from above and for energy we have used,
(1/2)*rho*Velocity^2

We have ignored the pressure head because the base of the channel is the datum, right?
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Old Jan 29th 2015, 07:54 AM   #4
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Originally Posted by pheonixrider View Post
We have ignored the pressure head because the base of the channel is the datum, right?
Yes - like I said, I assume the channel is level. If the water has to flow up or downhill then you would add in a delta h term.
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