Fluid Statics 1 Flashcards
How can forces be calculated?
In terms of pressure distribution of the fluid
What impacts do molecules have with walls?
- Elastic
- Energy and momentum conserved
What type of forces is pressure?
Normal
What is the gas pressure?
The force per unit area on the piston
What is the unit for pressure?
Pascals
What is 1 bar equal to?
10e5 Pa
What is atmospheric pressure?
101,325 Pa
How are large pressures produced?
When small forces act over small areas
How can small pressures be produced?
When large forces act over large areas
What is the transmission of pressure like in a fluid?
Fast but not instantaneous
What does the transmission speed of pressure depend on?
The speed of sound in the medium and shape of the container
What do hydraulic presses use to produce large forces?
The transmissibility of pressure
What is the absolute pressure?
Pressure with respect to a vacuum
What is gauge pressure?
Pressure measured relative to a local atmospheric pressure
How can gauge pressure be calculated?
Pgauge = Pabs - Patm
What is the net force on a fluid in a static situation?
Zero
What is the equation of fluid statics?
dP/dz =ρ * g
How does pressure change?
With depth
How does pressure behave in the horizontal plane?
It is constant
What’s the equation for mass when density constant?
m = rho* A * (z*)
What’s the pressure when density constant?
P = P_0 + rhog(z*)
What is the pressure difference equal to?
The fluid weight per area
How does pressure increase when density constant?
Linearly
What is the water level like in connected tubes in a reservoir?
The same level of water as in the reservoir
What is the density of a gas like compared to a liquid?
Much smaller
What is a manometer used for?
Measuring pressure difference between two locations in a flow
What does manometers look like?
U-tubes
