HES 2340 FLUID MECHANICS 1
Discussion:
Efficiency, =
Based on the equation above, the efficiency is inversely proportional to the power input. The
power input is directly proportional to the cost of the pump. In this assignment, we are requested
to find the low cost pump. As to find the lowest cost of the pipe, the power input has to be as
much lower as possible. Therefore the lower the power input, the higher it’s efficiency,. From the
graph drawn above the max efficiency is at about 0.74, the range of validity, C is about 0.16
which later bring into the calculation part to calculate the performance of the pump.
The selection of the ideal pump is based upon the following assumptions:
1.
That the pressure at P
1
and P
2
is a gage pressure, that is at atmospheric pressure, therefore
indicating the P
1
and P
2
are equal to zero.
2.
That the shaft rotation rate not slower than, n = 600rpm = 20π rad/s.
3.
That rate of flow not least than, Q = 6.309
m/s
4.
Using the continuity theorem, that implies that the density is conserved.
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 Three '09
 tomedwards
 Pressure measurement, Substitute good

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