Steady and Unsteady Flow MCQ Quiz in தமிழ் - Objective Question with Answer for Steady and Unsteady Flow - இலவச PDF ஐப் பதிவிறக்கவும்

Explanation:

Flooding occurs when there are excessive stream discharge and water spills of the channel onto the adjacent flood plain in all the direction. The flooding of the river is an example of unsteady and non-uniform flow.

There are many different types of flow and are classified as below:

1. Steady flow: it is defined as a type of flow in which the fluid characteristics like velocity (V), pressure (P), density (ρ), etc. at a point do not change with time.

Steady flow is mathematically represented as

​\(\left (\frac{\partial V}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\),\(\left (\frac{\partial P}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\), \(\left (\frac{\partial ρ}{\partial t} \right )_{x_{o},{y_{o}},{z_{o}}} = 0\)

2. Unsteady flow: is defined as a type of flow in which velocity pressure or density at a point changes with respect to time.
3. Uniform flow: is defined as a type of flow in which velocity at any given time does not change with respect to space (i.e., length of direction of the flow)
   • uniform flow is mathematically represented as \(\left (\frac{\partial V}{\partial s} \right )_{t\ =\ constant} = 0\)
   • \(\partial V\) = Change of velocity, \(\partial s\) = Length of flow in the direction s
4. Non - uniform flow: is a type of flow in which velocity at any given time changes with respect to space.

Additional Information

The other type of flow are as follows

1. Laminar flow: is a type of flow in which the fluid particles move along well-defined paths or streamline and all the streamlines are straight and parallel. It is also called streamline flow or viscous flow. 
2. Turbulent flow: is that type of flow in which fluid particles move in a zig-zag way. due to the zig-zag movement of fluid-particle eddies formation take place which is responsible for high energy loss. 
   • Laminar and turbulent flow are determined by Reynolds number \(Re = \frac{ρ\ VL}{μ}\), where V = mean velocity of flow, μ = dynamic viscosity, L= characteristic dimension
   • For pipe flow if Reynolds number is less than 2000 then the flow is laminar, If Reynold number is more than 4000 flow is turbulent.
3. Compressible flow: type of flow in which density of fluid changes from point to point. 
   • for compressible flow density, \(\rho\neq Constant\)
4. Incompressible flow: type of flow in which density is constant.

Explanation:

Uniform but Unsteady Flow in Fluid Dynamics

• In fluid dynamics, a uniform flow refers to a flow in which the velocity of the fluid at any given point in the space does not vary with position. However, in an unsteady flow, the velocity can vary with time. Therefore, a uniform but unsteady flow is one where the fluid velocity is the same at every point in the space at any given instant but can change over time.
• In a uniform but unsteady flow, the primary characteristic is that the flow parameters (e.g., velocity, pressure) are the same at every point in a given cross-section at any instant.
• However, these parameters can change as time progresses.
• This type of flow is often seen in situations where external conditions influencing the flow change over time, such as varying wind speeds or fluctuating pressure conditions.

Smoke rising uniformly but varying in velocity from a chimney over time.

• This option correctly illustrates a uniform but unsteady flow. The smoke rises uniformly, meaning its velocity is consistent across any horizontal cross-section at a given height at any instant. However, the velocity of the smoke changes over time, indicating that the flow is unsteady. This can happen due to changes in the temperature of the chimney, variations in the wind speed, or other external factors affecting the velocity of the smoke.

Explanation:

• The flow is defined as uniform flow when in the flow field the velocity and other hydrodynamic parameters do not change from point to point at any instant of time.
• Steady flow, a flow in which the velocity at any point in the channel does not change with time.
• Steady uniform flow is a type of flow in which the conditions of flow do not alter with regard to the time at any given point on the passage.

Explanation:

Type of flow depends on the various condition of the shape of pipe and discharge which is described in the table below.

Solve by putting u = 0 and v = 0 in the given equations.