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Concentrated Streamlines versus Higher Velocity

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Old   October 27, 2017, 05:24
Default Concentrated Streamlines versus Higher Velocity
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I feel this might be a basic question.

There are two cross sections (not in the same body). One section has streamlines passing through with a high velocity, but which are more diffuse. The other section has concentrated, bunched up streamlines with a slightly lower velocity. The flow can be considered laminar.

Now I know that a streamline denotes only a fluid element and not the mass per se, so would it be wrong to assume that more concentrated streamlines means more matter flowing past?

Specifically, given wind speed generation, would less-dense streamlines with a high velocity passing through the blades generate more energy or would concentrated streamlines with a lower velocity generate more? I know this depends on the figures so do be as general as you can.

Thanks!

Edit: A high concentration of streamlines denotes a high pressure? Is that all it denotes?

Last edited by eucalyptus; October 27, 2017 at 07:10.
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Old   October 27, 2017, 11:54
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Quote:
Originally Posted by eucalyptus View Post
I feel this might be a basic question.

There are two cross sections (not in the same body). One section has streamlines passing through with a high velocity, but which are more diffuse. The other section has concentrated, bunched up streamlines with a slightly lower velocity. The flow can be considered laminar.

Now I know that a streamline denotes only a fluid element and not the mass per se, so would it be wrong to assume that more concentrated streamlines means more matter flowing past?

Specifically, given wind speed generation, would less-dense streamlines with a high velocity passing through the blades generate more energy or would concentrated streamlines with a lower velocity generate more? I know this depends on the figures so do be as general as you can.

Thanks!

Edit: A high concentration of streamlines denotes a high pressure? Is that all it denotes?

Only for 2D flows you can consider that the flow between two different streamlines has constant flow rate. In such a case, the velocity increases where the streamlines are closer.
In a 3D flow the streamlines has no longer such property
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