Characteristic system curve for a two branch system

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To find the characteristic system curve for a two-branch system with different fluids and pumps, a detailed system diagram and specific fluid properties such as density, viscosity, and temperature are essential. The discussion emphasizes the importance of understanding whether the fluids will chemically react or simply mix, with a preference for considering dilution to simplify the analysis. Basic engineering principles, including mass, energy, and momentum conservation equations, must be applied at each node in the system. Additionally, pump curves and friction factor equations are necessary for accurate calculations. The approach to this problem involves both steady-state and transient analysis, highlighting its complexity.
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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.
 
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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?
 
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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?
 
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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.

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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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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.
 
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