potential flow, ideal fluid, definition

Ideal fluid is incompressible and it is having zero viscosity. Flow of Ideal fluid is known as potential flow. Potential flow is highly developed. Main characteristics of potential flow are:

1.  No eddies, no circulations within the fluid flow. So potential flow is irrotational flow.
2.  No friction is developed in the fluid. Therefore there is no dissipation of mechanical energy into heat.

Therefore: Potential flow is incompressible, irrotational, highly developed and having zero viscosity.