Pressure in fluids

Question 1

Laws of pressure in fluid

Answer 1

1. Pressure exerted by fluid at rest is always at right angles to surface of vessel
2. Fluid at rest the pressure is the same in all directions
3. Downward pressure in open vessel is proprtional to depth
4. Downward presure is subject to density of fluid
5. downward pressure isindependant of shape of vessel

Question 2

what is head of pressure

Answer 2

the effective vertical height of a column of water

ie a jet on an upper floor or height of tank above ground level

Question 3

Pressure formulae

Answer 3

P = H X .0981   bar
H = P X 10.19   bar
pressure = force x area

Question 4

what is suction

Answer 4

the reduction in pressure at one end of a pipe. allowing atmospheric pressure to force water up the pipe.

Question 5

factors effecting suction

Answer 5

1. Create flow in water
2. Raise the water
3. overcome entry loss at impeller as water changes direction
4. overcome suction loss due to friction in stariner