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Abstract:
In this experiment, we were able to estimate the head losses in different sorts of
valves and piping connections assembled in two separate hydraulic pipes circuits.
Experimental values of loss coefficient (K), the relation between friction coefficient
(f) and Reynolds number for a straight pipe, the relation between flow rate (Q) and
head loss (h
L
) were found. Their theoretical values were calculated and compared to
the experimental values. For instance, the error % for (h
L
) for the pipes with sudden
expansion and (Q = 2.37E4 m
3
/s) was found to be 4.32% while with the same (Q) the
error % for the sudden contraction was 43.6%. For the same pipe, the experimental
value of K for both gate and globe was compared with the literature value to produce
an error 78.4% and 97.1% respectively.
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View Full DocumentIntroduction:
In chemical processes, a lot of pipes connections are involved to carry the treated
fluids.
During fluid transfer, a pressure loss exists due to the change in the flow phenomena
such as, a change in pipes diameter or flow direction, which cause a resistance of
fittings or valves to let the fluid pass smoothly. Pressure loss in pipe circuit is sorted
into one due to the viscous resistance throughout the whole system and another due to
fitting and pointed effects .The overall loss is the sum of both. So, we can say the total
loss can be different than the sum of the losses of the separate components. By
conducting this experiment, we’ll be able to find the pressure losses across to different
systems. Also, for the straight pipe portion, the relations (f Vs Re) and (Q Vs h
L
) will
be generated.
Theoretical Background:
For an incompressible fluid flowing through a pipe the continuity eq. (Q=V
1
A
1
=V
2
A
2
)
is applicable.
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 Fall '09
 M.Elgaily

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