Unsteady Flow During Valve Operation
The flow occurring in a pipeline when a valve is being opened is classified as unsteady.
Understanding Unsteady Flow
Unsteady flow, also known as transient flow, is characterized by flow properties like velocity and pressure changing with time at any given point in the system.
Valve Operation and Flow Dynamics
- When a valve is initially closed, there is no flow.
- As the valve begins to open, the resistance to flow decreases, and the flow rate starts to increase.
- This process involves a continuous change in velocity and pressure throughout the pipeline over a period of time.
- The flow eventually reaches a steady state once the valve is fully open and conditions stabilize, but the *process* of opening involves unsteady conditions.
Therefore, the dynamic changes occurring due to the valve movement define the flow as unsteady during the opening phase.
Important Questions from Fluid Kinematics
In a free vortex, velocity
The velocity potential function for a line source varies with radial distance, r as
If ψ = xy, the magnitude of the velocity vector at (2, -2) is
A velocity field is given by the equation v = (2 + 6x - 6y)i + (3x + cx - y)j. For the flow to be irrotational the value of constant ‘c’ is
If fluid properties in a flow are constant with space at any instant of time, the flow is termed as:
