# Characteristic system curve for a two branch system

• giuseppe2127
giuseppe2127
How can one find the characteristic system curve for a system with two different branches, each with its own fluid, T and centrifugal pump, that will than converge in a single line making a whole new fluid at a new T ? Thanks in advance.

Last edited:
giuseppe2127 said:
How can one find the characteristic system curve for a system with two different branches, each with its own fluid, T and centrifugal pump, that will than converge in a single line making a whole new fluid at a new T ?
We need a system diagram and fluid information to even begin to help you. Fluid information includes density, viscosity, and temperature for each fluid. Do they chemically react, or merely mix? And what is T?

giuseppe2127
Welcome to PF.

giuseppe2127 said:
How can one find the characteristic system curve for a system with two different branches, each with its own fluid, T and centrifugal pump, that will than converge in a single line making a whole new fluid at a new T ? Thanks in advance.
Is this question for your schoolwork?

giuseppe2127
Hello, I’ve recently wanted to refresh some notions about pumping systems and started wondering how systems there aren’t as basic as a tank-line-tank would work. I found this specific example in another context, where fluids werent specified but I can look further. I was more interested on what the correct approach would be in this type of case, but I can look further for some data if it’s necessary ! I’d avoid considering a chemical reaction, maybe a dilution would be best, just to not make things more complex ! Thanks

It sounds to me you are looking for some basic technique on how to handle flow division in a fluid network.

If that is the case I hope you would be interested in seeing/trying how you might tackle this type of problem first? Even being basic engineering fluid mechanics, it's not a trivial procedure.

If some ##Q## was going through the pump, how much volumetric flowrate goes through line 1 and 2 respectively ##Q_1, Q_2##, given constant friction factor coefficients ##f_1,f_2##?

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berkeman
For general network flow problems, one writes the mass, energy, and momentum conservation equations at each "node" and then solves simultaneously. You will also need equations for the pump curves, a friction factor equation, Moody chart, etc. Thermophysical properties may need to be calculated.

Steady state is simpler than transient.

berkeman, Lnewqban and erobz

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