A three-phase transformer bank consists of 3 single-phase transformers to handle 400 kVA witha 34.5kV/13.8kV voltage ratio. Find
1 answer:
You might be interested in
Solution :
Given :
h = 2 cm
Diameter of the tube , d = 1 mm
Diameter of the hose, D = 6 mm
Between 1 and 2, by applying Bernoulli's principle, we get
As point 1 is just below the free surface of liquid, so
Therefore, 111.325 kPa is the gas supply pressure required to keep the water from leaking back into the tube.
Velocity at point 2,
= 1.617 m/s
Flow of water,
Minimum air flow rate,
= 0.0449 m/s
b). Reynolds number in hose,
υ for water at 25 degree Celsius is
υ for air at 25 degree Celsius is
= 17.25
Therefore the flow is laminar.
Reynolds number in the pipe
= 1816.85, which is less than 2000.
So the flow is laminar inside the tube.
Answer:
Explanation:
Given that
We know that
Rex=ρvx/μ
So
All other quantities are constant only x is a variable in the above equation .so lets take all other quantities as a constant C
We also know that
Nux=hx/K
m is the constant
This is local heat transfer coefficient
The average value of h given as
---------1
The value of local heat transfer coefficient at x=L
-----------2
From 1 and 2 we can say that