2. Boundary Layer Transition
The chapter discusses the transition from laminar to turbulent boundary layers, including the significance of the transition zone and laminar sub-layer. It emphasizes key concepts such as boundary layer thickness, distortion of fluid particles within the boundary layer, and various important definitions related to boundary layer analysis such as displacement thickness and momentum thickness.
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What we have learnt
- The transition zone marks the shift from laminar to turbulent flow in boundary layers.
- The laminar sub-layer is a thin region in the turbulent boundary layer that exhibits a linear velocity profile.
- Boundary layer thickness is defined as the distance from a flat plate at which fluid velocity approaches the free stream velocity.
Key Concepts
- -- Laminar Sublayer
- A thin region in turbulent boundary layers where viscous effects dominate and the velocity profile is assumed linear.
- -- Boundary Layer Thickness
- The distance from a solid surface to a point where the fluid velocity is within a specified percentage of the free stream velocity.
- -- Displacement Thickness (delta star)
- A measure of how much the velocity profile is displaced from that of a uniform profile due to the presence of the boundary layer.
- -- Momentum Thickness (theta)
- A thickness measurement that accounts for the momentum deficit in the boundary layer compared to the free stream.
- -- Energy Thickness (delta double star)
- A measure of the energy deficit due to the velocity variations within the boundary layer.
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