Laminar and turbulent flow, the liquid or object?

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Discussion Overview

The discussion revolves around the concepts of laminar and turbulent flow, specifically focusing on the relationship between Reynolds number, fluid viscosity, and the nature of flow around objects. Participants seek clarification on whether the term "laminar flow" applies to the fluid, the object, or both.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that a low Reynolds number indicates that viscous forces dominate and inertia plays no role, suggesting a laminar flow regime.
  • One participant asserts that the term "laminar flow" applies only to fluids, not to objects.
  • Another participant questions whether it is correct to say that the object is in a laminar flow regime, seeking clarification on the terminology.
  • It is suggested that the flow around the object can be described as laminar, rather than the object itself exhibiting laminar flow.

Areas of Agreement / Disagreement

Participants express differing views on whether the term "laminar flow" can be applied to objects or is strictly limited to fluids. The discussion remains unresolved regarding the precise terminology and implications of laminar flow in relation to objects.

Contextual Notes

There are limitations in the discussion regarding the definitions of laminar flow and the conditions under which it applies, as well as the implications of Reynolds number in different contexts.

rwooduk
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Please could someone verify this statement as I understand things:

If an object has a low reynolds number (or the fluid is very viscous) then it is dominated by viscous forces and inertia plays no role. The object is in a laminar flow regime.

That last part, is it correct? What I'm asking is, is it the object laminar flowing or is it the liquid that is laminar flowing?

Thanks for any help clearing this up.
 
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rwooduk said:
Please could someone verify this statement as I understand things:

If an object has a low reynolds number (or the fluid is very viscous) then it is dominated by viscous forces and inertia plays no role. The object is in a laminar flow regime.

That last part, is it correct? What I'm asking is, is it the object laminar flowing or is it the liquid that is laminar flowing?

Thanks for any help clearing this up.
The term laminar flow applies only to fluids, not objects.

Chet
 
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Chestermiller said:
The term laminar flow applies only to fluids, not objects.

Chet

Thanks for the reply.

So you would say, the object is subject to a laminar flow regime?
 
rwooduk said:
Thanks for the reply.

So you would say, the object is subject to a laminar flow regime?
No. If I understand you correctly, rigid objects to not exhibit laminar flow.

Chet
 
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You would say the flow around the object is laminar.
 
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That's great many thanks all.
 

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