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How to calculate Re for a flow channel with varying diameter?

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Old   November 22, 2021, 13:19
Default How to calculate Re for a flow channel with varying diameter?
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Ram N
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I am trying to calculate the Reynolds number for the flow shown in the picture. As you can see in the attached picture, the flow expands into a larger diameter and then confines into a smaller diameter. Could anyone please tell me how to calculate the Reynolds number in the highlighted region? is the flow laminar or turbulent in that region?

Also, what turbulence model would be suitable for that flow?

Please feel free ask any questions.

https://ibb.co/QmM9pn5
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Old   November 22, 2021, 14:06
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Filippo Maria Denaro
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Quote:
Originally Posted by nrram View Post
I am trying to calculate the Reynolds number for the flow shown in the picture. As you can see in the attached picture, the flow expands into a larger diameter and then confines into a smaller diameter. Could anyone please tell me how to calculate the Reynolds number in the highlighted region? is the flow laminar or turbulent in that region?

Also, what turbulence model would be suitable for that flow?

Please feel free ask any questions.

https://ibb.co/QmM9pn5



You have about 10^3 for the exiting flow and increases while expanding in the larger section. Flow is turbulent there.
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confined circular jet, expanding pipe, pipe flow, reynolds number, turbulence model

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