Lecture 24.pptx

# Lecture 24.pptx - Lecture 24 CBE 218 Fluid Mechanics April...

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Lecture 24 CBE 218 Fluid Mechanics April 1, 2015

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Pump efficiency (ɳ) = useful work/total work= (ΔP/ )/(dWn,f/dm) dWn,f/dm = Δ (P/  + gz + V 2 /2) + F ɳ = ṁ(ΔP/ )/ṁ (dWn,f/dm) ɳ = ṁ(ΔP/ )/(dm/dt) (dWn,f/dm) dWn,f/dt = Power (supplied) Q= ṁ/ ɳ = Q.(ΔP)/POsupplied A pump is pumping 50 gal/min of water from a pressure of 30 psia to a pressure of 100 psia. The changes in elevation and velocity are negligible. The motor that drives the pump supplies 2.8 hp. What is the efficiency of a pump? ɳ = hydraulic horse power/total power supplied. 1 gal = 231 in 3 1 hp = 33,000 ft.lbf/min
P.D. Pump (constant volumetric flow device) Volumetric flow rate = (piston area* piston travel*cycle)/time

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Problem 10.1 How many gallons per minute should be delivered by a pump with a piston area of 10 in 2 and a piston stroke of 5 in and a speed of 1 Hz? Problem 10.2 Calculate the hydraulic horsepower for pumping 500 gal/min from an inlet pressure of 5 psig to an outlet pressure of 30 psig.
Centrifugal pump - 1Q

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Centrifugal pump Pump head = h (height to which the pump will lift a fluid at a given flow rate.
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