To solve the exercise, it is necessary to apply the concepts related to the conservation of the energy flow given by Bernoulli and the equation of head loss in the pipe for laminar flow. Through them and the calculation of the flow we can identify the flow rate of oil.
Bernoulli is defined by,
Where,
P = Pressure
= Density
z= Datum height
V = Velocity
g = Gravitaty constant
= frictional head loss in the pipe
There is no change in the final height datum nor initial speed. So,
Re-arrange to find the head loss,
In the case of the head loss in the pipe for laminar flow we have that
Equation we have,
At this point our values are given as,
Therefore,
Finally the discharge is given as
Where,
A= Area
V = Velocity
That is equal in cm^3 per hour as,
Therefore the flow rate of oil is 4521cm^3/h
Answer:
Hello your question is incomplete below is the complete question
Electronic components are often mounted with good heat conduction paths to a finned aluminum base plate, which is exposed to a stream of cooling air from a fan. The sum of the mass times specific heat products for a base plate and components is 5000 J/K, and the effective heat transfer coefficient times surface area product is 10 W/K. The initial temperature of the plate and the cooling air temperature are 295 K when 300 W of power are switched on. 1) Find the plate temperature after 10 minutes.
answer ; 311.36 k
Explanation:
Given data :
sum of mass * specific heat products for a base plate and components ( Mcp )
= 5000 J/K
effective heat transfer coefficient * surface area ( hA ) = 10 W/K
Initial temperature of plate and cooling air temperature( Tc ) = 295 k
power ( Q = W ) = 300 W
a) Determine plate temperature after 10 minutes
10 mins = 600 secs ( t )
heat supplied = change in temp + heat loss
Q * t = mCp ( ΔT ) + hA ( ΔT ) t
300*600 = 5000 * ( T -295 ) + 10 ( T -295 ) * 600
therefore ; T - 295 = 16.363
T = 311.36 K
Answer:
D. The maximum velocity decreases with distance from the entrance.
Explanation:
This is because over time, the pressure with with the incompressible liquid enters decreases with distance from the entrance
Answer:
Explanation:
= Outside temperature =
= Temperature of room =
= Heat loss = 135000 kJ/h =
Coefficient of performance of heat pump
Input power
The minimum power required to drive this heat pump is .