# 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.

#### Is flow steady or unsteady?

**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