laminar and turbulent flow?

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Laminar flow: Fluid moves in smooth, parallel layers with little mixing. Velocity is uniform at a given cross-section.
- Occurs when Reynolds number (Re) < 2000.
- Example: Flow of honey or oil in a narrow pipe.
Turbulent flow: Fluid particles move chaotically with eddies and vortices. Mixing is high.
- Occurs when Re > 4000.
- Example: Flow of water in large pipelines, river water, air around an airplane wing.

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