Question

When the hydrodynamic boundary layer thickness which is the distance from the surface?

Answer 1

The distance from the surface where the is measured as the hydrodynamic boundary layer thickness. The local exterior velocity is the same as the speed.

What is velocity?

• Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound).
• In kinematics, the area of classical mechanics that deals with the motion of bodies, velocity is a fundamental idea.
• A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined.
• Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or ms1) in the SI (metric system).

What is speed?

• The speed of an object, also known as v in kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time, making it a scalar quantity.
• The instantaneous speed is the upper limit of the average speed as the duration of the time interval gets closer to zero.
• The average speed of an object in a period of time is the distance traveled by the object divided by the duration of the interval.
• Velocity and speed are not the same thing.

Learn more about velocity here:

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