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In open channels, the specific energy is the
- a)total energy per unit discharge
- b)total energy measured with respect to the datum passing through the bottom of the channel
- c)total energy measured above the horizontal datum
- d)kinetic energy plotted above the free surface of water
Correct answer is option 'B'. Can you explain this answer?
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In open channels, the specific energy is thea)total energy per unit di...
Specific Energy in Open Channels
Specific energy is a term used in open channel flow to describe the energy per unit weight of water flowing in the channel. It is defined as the sum of the elevation head, the pressure head, and the velocity head of the flowing water per unit weight.
Measuring Specific Energy
In open channels, the specific energy is measured with respect to a horizontal datum passing through the bottom of the channel. This is because the bottom of the channel is usually the reference point for measuring the elevation of the water surface.
Calculating Specific Energy
The specific energy of flowing water in an open channel can be calculated using the following formula:
E = y + (V^2/2g) + (P/γg)
Where:
E = specific energy
y = elevation head
V = velocity of water
g = acceleration due to gravity
P = pressure head
γ = specific weight of water
Interpretation of Specific Energy
The specific energy of flowing water in an open channel is an important parameter that affects the behavior of the flow. For example, if the specific energy of the flow is less than the critical specific energy, the flow is subcritical and the water surface is smooth. If the specific energy is greater than the critical specific energy, the flow is supercritical and the water surface is rough.
Conclusion
In open channels, the specific energy is the total energy per unit weight of water flowing in the channel, measured with respect to a horizontal datum passing through the bottom of the channel. It is an important parameter that affects the behavior of the flow and can be calculated using the elevation head, velocity head, and pressure head of the flowing water.
Specific energy is a term used in open channel flow to describe the energy per unit weight of water flowing in the channel. It is defined as the sum of the elevation head, the pressure head, and the velocity head of the flowing water per unit weight.
Measuring Specific Energy
In open channels, the specific energy is measured with respect to a horizontal datum passing through the bottom of the channel. This is because the bottom of the channel is usually the reference point for measuring the elevation of the water surface.
Calculating Specific Energy
The specific energy of flowing water in an open channel can be calculated using the following formula:
E = y + (V^2/2g) + (P/γg)
Where:
E = specific energy
y = elevation head
V = velocity of water
g = acceleration due to gravity
P = pressure head
γ = specific weight of water
Interpretation of Specific Energy
The specific energy of flowing water in an open channel is an important parameter that affects the behavior of the flow. For example, if the specific energy of the flow is less than the critical specific energy, the flow is subcritical and the water surface is smooth. If the specific energy is greater than the critical specific energy, the flow is supercritical and the water surface is rough.
Conclusion
In open channels, the specific energy is the total energy per unit weight of water flowing in the channel, measured with respect to a horizontal datum passing through the bottom of the channel. It is an important parameter that affects the behavior of the flow and can be calculated using the elevation head, velocity head, and pressure head of the flowing water.
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In open channels, the specific energy is thea)total energy per unit di...
Specific energy is total energy in unit weight of pipe with respect to pipe bottom
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In open channels, the specific energy is thea)total energy per unit dischargeb)total energy measured with respect to the datum passing through the bottom of the channelc)total energy measured above the horizontal datumd)kinetic energy plotted above the free surface of waterCorrect answer is option 'B'. Can you explain this answer?
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