## Flow rate in a pump

two tanks were placed. tank one at a higher level and other(tank 2) at lower level. But in tank 2 a pump of flow rate Q ml/min is affixed.what is the flow rate in tank 2. Same as Q /min???

 PhysOrg.com science news on PhysOrg.com >> Front-row seats to climate change>> Attacking MRSA with metals from antibacterial clays>> New formula invented for microscope viewing, substitutes for federally controlled drug

Blog Entries: 27
Recognitions:
Gold Member
Homework Help
hi hamshie.k! welcome to pf!
 Quote by hamshie.k two tanks were placed. tank one at a higher level and other(tank 2) at lower level. But in tank 2 a pump of flow rate Q ml/min is affixed.what is the flow rate in tank 2. Same as Q /min???
??

what exactly is the whole question?

 tank 1 is placed above the level of tank 2. the water flows into tank 2 by the gravitational force from tank 1. But from thank 2 a pump is fixed to suck the water and again pump it into the tank 1. the question is whether the tank 2 will have the same flow rate of the pump, at the top surface of the tank??

Blog Entries: 27
Recognitions:
Gold Member
Homework Help

## Flow rate in a pump

 Quote by hamshie.k … But from thank 2 a pump is fixed to suck the water and again pump it into the tank 1.
ahh!
ok, tell us what you think, and why, and then we'll comment!

 A pump is placed in the top level surface of the tank 2. at a suction end . delivered to tank 1
 Blog Entries: 27 Recognitions: Gold Member Homework Help Science Advisor (yes, i know, but) tell us what you think the answer is
 same as the flow rate of the pump. i need that condition

Blog Entries: 27
Recognitions:
Gold Member
Homework Help
 Quote by hamshie.k same as the flow rate of the pump.
correct

but why? (eg, is anything conserved, ie the same?)

 No external force applied
 Blog Entries: 27 Recognitions: Gold Member Homework Help Science Advisor forget the physics, just look at the material … the total amount of water is the same (W1 + W2 = constant), so W1' + W2' = 0
 Is it not possible that the pump in T2 can pump the water to T1 faster then T1 flows into T2?

Blog Entries: 27
Recognitions:
Gold Member
Homework Help
 Quote by Avis Is it not possible that the pump in T2 can pump the water to T1 faster then T1 flows into T2?
if it's a closed system, where all the water has to be either in T1 or in T2 (or in the pipe between them, which we can assume is always full),

then the water lost by T2 has to equal the water gained by T1

Fair, I was thinking in a more practical way.

 Quote by tiny-tim if it's a closed system, where all the water has to be either in T1 or in T2 (or in the pipe between them, which we can assume is always full), then the water lost by T2 has to equal the water gained by T1

 Maybe I'm thinking about this all wrong, but if you let water drain from T1 through a 3" hose and have a pump in T2 with a 1/8" discharge line back to T1, you will not have equal flow through the tanks. They may eventually reach a level of system equillibrium, but the flow rates need not be the same...If the pump is at the surface of the water and drawing from only the head (water level) in T2, then your flow rate will be based on the pump characteristics, not the flow through the gravity line. Unless you mean tank T2 is fully filled, then obviously the only amount of water that could flow "into" it would be the amount that is flowing "out" to T1.
 Please anyone help me . how i should start calculations for these kind of problems. 1. gravity flow from tank one to tank 2(i am planning to analyse for the tank placed below the level of tank 1 and also for the same level tanks) 2. pump calculations from tank 2 to tank 1 I dont know how to start the problem?? whether i should start from friction losses and benoulli eqn. i have the flow rate of the pump(peristaltic pump). please guide me what are the calculations i need regarding this??