Bernoulli's Principle - Key terms

AERODYNAMICS:

The study of airflow and its principles. Applied aerodynamics is the science of improving man-made objects in light of those principles.

AIRFOIL:

The design of an airplane's wing when seen from the end, a shape intended to maximize the aircraft's response to airflow.

ANGLE OF ATTACK:

The orientation of the airfoil with regard to the airflow, or the angle that the chord line forms with the direction of the air stream.

BERNOULLI'S PRINCIPLE:

A proposition, credited to Swiss mathematician and physicist Daniel Bernoulli (1700-1782), which maintains that slower-moving fluid exerts greater pressure than faster-movingfluid.

CAMBER:

The enhanced curvature on the upper surface of an airfoil.

CHORD LINE:

The distance, along an imaginary straight line, from the stagnation point of an airfoil to the rear, or trailing edge.

CONSERVATION OF ENERGY:

A law of physics which holds that within a system isolated from all other outside factors, the total amount of energy remains the same, though transformations of energy from one form to another take place.

FLUID:

Any substance, whether gas or liquid, that conforms to the shape of itscontainer.

HYDRODYNAMICS:

The study of water flow and its principles.

INVERSE RELATIONSHIP:

A situation involving two variables, in which one of the two increases in direct proportion to the decrease in the other.

KINETIC ENERGY:

The energy that an object possesses by virtue of its motion.

LAMINAR:

A term describing a streamlined flow, in which all particles move at the same speed and in the same direction. Its opposite is turbulent flow.

LIFT:

An aerodynamic force perpendicular to the direction of the wind. For an aircraft, lift is the force that raises it off the ground and keeps it aloft.

MANOMETERS:

Devices for measuring pressure in conjunction with a Venturi tube.

POTENTIAL ENERGY:

The energy that an object possesses by virtue of its position.

STAGNATION POINT:

The spot where airflow hits the leading edge of an airfoil.

TURBULENT:

A term describing a highly irregular form of flow, in which a fluid is subject to continual changes in speed and direction. Its opposite is laminar flow.

VENTURI TUBE:

An instrument, consisting of a glass tube with an inward-sloping area in the middle, for measuring the drop in pressure that takes place as the velocity of a fluid increases.

VISCOSITY:

The internal friction in a fluid that makes it resistant to flow.