Calculating the needed height for reservoir

[driga]

Hi all,

I have a system as shown in the schematic (see attachement).

The reference height is z=0, number 1 and 3 are reservoir. The use of upper reservoir (nr. 1) is to damp the pulsation of the pump. I want to calculate the height so that the flow rate inside my channel (nr. 2) is according to the necessary reynold number. The upper reservoir is supplied by a flow from a pump.

I use bernoulli equation at upper and lower reservoir. Is it the correct way to do that? I can calculate the losses in my system (nr. 2) including the loss along the pipe.

Thank you.

 

[micalbrch]

I do not know if this is confusing only for me or for others too.

Your liquid shall flow from 1 to 3 and pass 2, right? 1 shall act as a pulsation dampener for the pump that feeds it. What kind of pump is that and what is the pressure of that pump? If you know that this pump must have a pulsation dampener, you will know this pump already. And if this pump requires a pulsation dampener, why will it not come from the supplier with dampener installed?

Are tank no. 2 and 3 pressuried?

 

[BigInch]

I think it would help if you showed a pump somewhere.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[driga]

It is a peristaltic pump. It does not come with a dampener. It has been there before I come and I have to use it. The pump can generate 1.3 bar to 3 bars (depends on the tube).

I know it might need a pulsation damper because of the pump is a positive displacement pump, is there anything wrong with my reasoning?

Thanks!

 

[whammett]

I agree with BigInch. I need to see where the pump is located in that drawing.


Will Chevron Corp.

 

[micalbrch]

O.k. Tank 1 is not really a tank/reservoir but just a pulsation dampener. So delete it in your sketch. It only confuses.

What about tank 2 and 3? Any pressure inside or just atmospheric pressure?

 

[robs68charger]

Why not just purchase a pulsation dampner. They make them specifically for these reason. There is no need to redo what many other companies already do. Just my thought