- #1
Femme_physics
Gold Member
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Again-- I'm not entirely sure if this goes to physics or engineering, but the word thing that comes in mind when I hear Bernoulli equation is PHYSICS, so I decided to post it here...
So I have this hydraulic system
http://img689.imageshack.us/img689/3596/clipboard01rvt.jpg
With the figures
H1 = Height of suctioning = 3m
H2 = Height of delivery = 25m
D1 = diameter of the suctioning pipe = 150mm
D2 = diameter of the delivery pipe = 100mm
Q = 0.02 [m^3/s]
y1 = pressure lost at the suctioning line
y2 = pressure lost at the delivery line
Energy conversation efficency of the pump = 75%
Find the pressure at the pump's entrance (p1).
In the solution
So I build the equation:
http://img196.imageshack.us/img196/2145/ber1j.jpg
http://img21.imageshack.us/img21/9740/ber2h.jpg
HOWEVER, the result in my manual is different. It's p1 = -0.05064x10^5 [Pa]
I don't get how could we have gotten such hugely different results!
Homework Statement
So I have this hydraulic system
http://img689.imageshack.us/img689/3596/clipboard01rvt.jpg
With the figures
H1 = Height of suctioning = 3m
H2 = Height of delivery = 25m
D1 = diameter of the suctioning pipe = 150mm
D2 = diameter of the delivery pipe = 100mm
Q = 0.02 [m^3/s]
y1 = pressure lost at the suctioning line
y2 = pressure lost at the delivery line
Energy conversation efficency of the pump = 75%
Find the pressure at the pump's entrance (p1).
Homework Equations
In the solution
The Attempt at a Solution
So I build the equation:
http://img196.imageshack.us/img196/2145/ber1j.jpg
http://img21.imageshack.us/img21/9740/ber2h.jpg
HOWEVER, the result in my manual is different. It's p1 = -0.05064x10^5 [Pa]
I don't get how could we have gotten such hugely different results!
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