1. Rotational and Irrotational Flow

2. Rotational Flow - Definition
The flow in which the fluid particle while flowing along the stream line rotates about its own axis is called as Rotational Flow

3. Irrotational Flow - Definition
The flow in which the fluid particle while flowing along the stream line does not rotates about its own axis is called as Rotational Flow

4. Rotational flow–In General
If you travel in a closed loop, you add up all the components of the fluid velocity vectors along your path and if the end result is not zero, then the flow is called as Rotational flow

5. Irrotational flow–In General
If you travel in a closed loop, you add up all the components of the fluid velocity vectors along your path and if the end result is zero, then the flow is called as Irrotational flow

6. Rotational flow–In Tech
If each fluid particle has an angular velocity about its mass centre , then the flow is considered to be in the rotational flow

7. Irrotational flow–In Tech
If the velocity is inversely proportional to the radius r, the two axes rotates in opposite direction

8. Normal Test to find the Flow
Rotational Flow
Irrotational Flow
To test whether the flow has a rotational component, you can put a small object in the flow and let the flow carry it. If the small object spins, it is called as Rotational Flow
To test whether the flow has a rotational component, you can put a small object in the flow and let the flow carry it. If the small object does not spins, it is called as Irrotational Flow

9. Rotational Flow-Tech Definition-Video

10. Thank You