# What is the definition of potential flow?

In fluid dynamics, a potential flow is described by means of a velocity potential φ, being a function of space and time. The flow velocity v is a vector field equal to the gradient, ∇, of the velocity potential φ: This implies that a potential flow is an irrotational flow.
A.

### What is viscous and inviscid flow?

viscous flow - Flows in which the frictional effects are significant are called viscous flows. inviscid flow. Details. When two fluid layers move relative to each other, a friction force develops between them and the slower layer tries to slow down the faster layer.

Steady-state flow refers to the condition where the fluid properties at a point in the system do not change over time. In a frame of reference that is stationary with respect to a background flow, the flow is unsteady. Turbulent flows are unsteady by definition.
• #### What do you mean by steady flow?

Definition of steady flow. : a flow in which the velocity of the fluid at a particular fixed point does not change with time — called also stationary flow; compare uniform flow.
• #### What is meant by external flow?

External flows are defined as those motions of a fluid medium which occur when the medium flows around a body immersed in it. External flows may be addressed by the methods of fluid mechanics.
B.

### What is meant by creeping flow?

Stokes flow (named after George Gabriel Stokes), also named creeping flow or creeping motion, is a type of fluid flow where advective inertial forces are small compared with viscous forces. The Reynolds number is low, i.e. In technology, it occurs in paint, MEMS devices, and in the flow of viscous polymers generally.
• #### What is meant by dynamic similarity?

In fluid mechanics, dynamic similarity is the phenomenon that when there are two geometrically similar vessels (same shape, different sizes) with the same boundary conditions (e.g., no-slip, center-line velocity) and the same Reynolds and Womersley numbers, then the fluid flows will be identical.
• #### What is meant by kinematic similarity?

Kinematic similarity – fluid flow of both the model and real application must undergo similar time rates of change motions. (fluid streamlines are similar) Dynamic similarity – ratios of all forces acting on corresponding fluid particles and boundary surfaces in the two systems are constant.
• #### How do you calculate a scale?

Calculating the Scaled Distance using the Actual Distance. If the scale is 1 : x, then divide the actual distance by x to calculate the map distance.
C.

### What do you mean by viscous flow?

The Viscous Flow. Dictionary definitions – Viscous flow A type of fluid flow in which there is a continuous steady motion of the particles, the motion at a fixed point always remaining constant. Laminar or Laminary consisting of or like thin plates or layers; of or relating to a fluid, streamlined flow.
• #### What is the law of inertia?

…first law, also called the law of inertia, states that, unless acted upon by an external force, an object at rest remains at rest, or if in motion, it continues to move in a straight line with constant speed. Uniform motion therefore does not require a cause.
• #### What are the 3 laws of motion?

Newton's First Law of Motion: I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. This we recognize as essentially Galileo's concept of inertia, and this is often termed simply the "Law of Inertia".
• #### What is the second law of physics?

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Updated: 26th November 2019