Hydraulic And Pnuematic Systems Flashcards
Definition of fluids?
A fluid is defined as a substance that can flow.
Definition of viscosity?
Defined as it’s internal friction or resistance to flow
Definition of Laminar flow?
Laminar flow is when the fluid travels smoothly or in regular paths
Definition of Turbulent flow?
Turbulent flow is where the fluid undergoes irregular fluctuations and mixing
Where the velocity is high, the pressure is ?????
Where the velocity is low, the pressure is ???
Where the velocity is high, the pressure is low.
Where the velocity is low, the pressure is high.
Properties of gases
Easily compressed No definite volume Elastic (no free surface) Low viscosity (flows easily) Very low friction
Properties of liquids
Incompressible Definite volume Had a free surface High viscosity than gas Will find it’s own level Friction higher than gas
Definition of pressure?
The amount of force acting on a unit area
What is the SI unit for pressure?
N/M squared or PA (pascal)
What are the non SI unit of pressure?
Bar
PSI
What are the 4 principles of pressure in a closed system?
1) The pressure at a point is the same in all directions.
2) The pressure exerted at a point on any surface is normal to that surface.
3) The pressure is transmitted without loss throughout the system.
4) The pressure in a liquid dose not depend upon the cross section of the container.
What are the 5 components of a pneumatic system?
Compressor Air receiver Air service unit Pneumatic valve Actuator
What is Bernoulli’s Principle ?
The pressure in a fluid decreases as the fluid velocity increases
How many pascals is in a bar?
1 Bar
In an open pressure system, what does fluid vary with?
Depth
