25. Open Channel Flow
The chapter focuses on the principles of fluid mechanics, particularly the behavior of fluid in pipes and open channels. It discusses the concepts of hydraulic and energy gradients, pressure heads, and the mechanical energy exchange in flowing systems like pumps and turbines. The significance of energy losses due to friction and other factors in hydraulic systems is also explored.
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Sections
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What we have learnt
- The hydraulic gradient line coincides with the free surface in open channel flow.
- Mechanical energy is converted into fluid energy via pumps, and vice versa with turbines, affecting pressure changes.
- Energy losses in hydraulic systems necessitate the consideration of efficiency in practical applications.
Key Concepts
- -- Hydraulic Gradient Line
- The line representing the potential energy of the fluid in open channel flow, coinciding with the free surface.
- -- Energy Gradient Line
- The line indicating the total mechanical energy of the fluid, including velocity heads above the free surface.
- -- Mechanical Energy
- This is the energy possessed by the fluid due to its velocity and pressure, significant in pumps and turbines.
- -- Bernoulli's Equation
- An equation that relates the pressure, velocity, and height of a fluid in a steady flow, providing insights into energy conservation.
- -- Coefficient of Discharge (Cd)
- A ratio used to determine the actual flow rate through an orifice compared to the theoretical flow rate.
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