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How to calculate pressure head for radial pump (turbulent flow)?

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Old   May 12, 2021, 12:58
Question How to calculate pressure head for radial pump (turbulent flow)?
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Abhishek
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Can I calculate pressure head of radial pump (turbulent flow) with the help of Bernoulli equation?

I have a radial pump (one input one output) for which I know rotational speed, and inlet mass flow rate (in short I know boundary condition, CFD simulation is also successfully carried out).
Now usually a pressure head between this two point 1 and 2 can be calculated according to Bernoulli's equation e.g. Pressure Head = (P2/Rho*g)-(P1/Rho*g)+(((v2)^2)-(v1^2))/2*g)

Now the real question is Bernoulli equation can be applied for laminar flow along streamline right?. In my case flow in the centrifuge is turbulent, and I am still using the above mentioned equation to calculate pressure head. Am I violating this principle?

Last edited by AbhishekShingalaCFD; May 12, 2021 at 15:49.
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Old   May 12, 2021, 15:07
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Can you describe more what is the context? What are the knowns?

Is this even a CFD related question or do you have a black box?
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Old   May 19, 2021, 14:19
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Quote:
Originally Posted by LuckyTran View Post
Can you describe more what is the context? What are the knowns?

Is this even a CFD related question or do you have a black box?
Yes this is CFD related question. I know rotational speed, Inlet mass flow rate and Outlet mass flow rate. I am calculating pressure and velocities at outlet and inlet with the help of cfd to calculate develop pressure head.
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Old   May 19, 2021, 17:21
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Bernoulli's equation is only for streamlines and has a lot of limitations, yes.

But there is a correct equation called the Mechanical Energy Balance equation, it looks almost exactly like Bernoulli's but it has the head losses in it which is how we define pressure head in the first place.

Last edited by LuckyTran; May 19, 2021 at 23:09.
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