Fluid flow problem- pressure vs momentum

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Discussion Overview

The discussion revolves around a fluid flow problem involving a tank with a pump suction line and a parallel line open to the atmosphere. Participants explore the implications of starting the pump and how it affects fluid levels in the connected tanks.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a setup with a tank, a pump suction line, and a parallel line to the atmosphere, questioning what happens when the pump starts.
  • Another participant suggests that the pump will suck fluid from both tanks until the one not being filled is empty, indicating that flow rates will equal the pump flow rate at the junction of the pipes.
  • A participant expresses concern about maintaining the fluid level in the second tank and questions whether connecting to the bottom pipe of the first tank will lead to the second tank emptying.
  • One participant proposes that connecting a pipe directly between the two tanks could help maintain the same water level, suggesting the use of another pump for filling one tank.

Areas of Agreement / Disagreement

Participants express differing views on whether the second tank will empty and the effectiveness of the proposed solutions. There is no consensus on the best approach to maintain fluid levels between the tanks.

Contextual Notes

Participants have not provided detailed assumptions or mathematical analyses regarding flow rates or pressure dynamics, leaving some aspects of the discussion unresolved.

Who May Find This Useful

This discussion may be of interest to individuals involved in fluid dynamics, engineering design, or those facing similar fluid flow problems in practical applications.

vishal badal
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I am having a tank at the bottom of which a pump suction line is connected..

there is another parralel line to that bottom line which is open to atmosphere.

Please note that this second pipe is connected to the bottom pipe; not to the tank...

there is only flow inlet to the tank.

what will happen when the pump will start??

will all the fluid in that parallel line which was initially present will be sucked??

or the tank will compensate that fluid by passing some fluid to maintain the same level as in the tank?

Please suggest...

If interested mail me on [email deleted by moderator]

I will let u know the detail drawing for explanation...
 
Last edited by a moderator:
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vishal badal said:
I am having a tank at the bottom of which a pump suction line is connected..

there is another parralel line to that bottom line which is open to atmosphere.

Please note that this second pipe is connected to the bottom pipe; not to the tank...

there is only flow inlet to the tank.

what will happen when the pump will start??

will all the fluid in that parallel line which was initially present will be sucked??

or the tank will compensate that fluid by passing some fluid to maintain the same level as in the tank?

Please suggest...

If interested mail me on [email deleted by moderator]

I will let u know the detail drawing for explanation...

How about providing us with a sketch of your setup.

CS
 
Last edited by a moderator:
vishal badal said:
I am having a tank at the bottom of which a pump suction line is connected..

there is another parralel line to that bottom line which is open to atmosphere.

Please note that this second pipe is connected to the bottom pipe; not to the tank...

there is only flow inlet to the tank.

what will happen when the pump will start??

will all the fluid in that parallel line which was initially present will be sucked??

or the tank will compensate that fluid by passing some fluid to maintain the same level as in the tank?

Please suggest...

If interested mail me on vish02vishal@yahoo.com

I will let u know the detail drawing for explanation...

Please find the attachment in the form of a drawing for ready reference..
 

Attachments

stewartcs said:
How about providing us with a sketch of your setup.

CS

Please find the attachment of a drawing for ready reference...named tank problem...

thanks for the reply...

please do the needful..
 
Last edited:
vishal badal said:
Please find the attachment of a drawing for ready reference...named tank problem...

thanks for the reply...

please do the needful..

The pump will suck from both tanks until the one not being filled is empty. At the point were the pipes are joined the flowrate will be the same as the pump flowrate. Going further into the the other two lines requires you to consider a parallel flow.

What are you trying to determine exactly.

CS
 
stewartcs said:
The pump will suck from both tanks until the one not being filled is empty. At the point were the pipes are joined the flowrate will be the same as the pump flowrate. Going further into the the other two lines requires you to consider a parallel flow.

What are you trying to determine exactly.

CS

thanx...

my concern is to keep the level of 2nd tank same as that of that of 1st...

it could have been possible easily if had connected the pipe from 2nd tank to 1st tank directly...rather line its discharge line...

now because i am connecting it to the bottom pipe of 1st; will it make a difference and as per your cocncern; will the 2nd tank become empty?

please find the drawing again...for reference...
 
vishal badal said:
now because i am connecting it to the bottom pipe of 1st; will it make a difference and as per your cocncern; will the 2nd tank become empty?

Yes it will empty eventually.

CS
 
well you can keep level the same by taking a pipe between both of them this will keep yput tanks at same level of water , and you can use another pump for filling process only on one tank
 

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