Answer:
Explanation:
Given;
For orifice, loss coefficient, K₀ = 10
Diameter, D₀ = 45 mm = 0.045 m
loss coefficient of the orifice, Ko = 10
Diameter of the gate valve, Dy = 1.5D₀ = 1.5 × 0.045 m = 0.0675 m
Total head drop, Δhtotal=25 m
Discharge, Q = 10 l/s = 0.01 m³/s
Now,
the velocity of flow through orifice, Vo = Discharge / area of the orifice
or
Vo =
or
Vo = 6.28 m/s
also,
the velocity of flow through gate valve, = Discharge / area of the orifice
or
=
or
= 2.79 m/s
Now,
the total head drop = head drop at orifice + head drop at gate valve
or
25 m =
where,
is the loss coefficient for the gate valve
on substituting the values, we get
25 m =
or
= 4.898
or