Answer:a solid is a hard material such as steel a gas is a lighter or hevyer than air but is not solid such as methane or carbon dioxide
Explanation:
The distance between the wall's normal to the point where the flow velocity has virtually attained the "asymptotic" velocity is the boundary layer thickness. Laminar and turbulent boundary layer flow are two distinct flow types. flow in a laminar boundary layer.
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What is a boundary layer?</u></h3>
- The thin layer of fluid that forms immediately around a bounded surface as a result of fluid flowing over the surface is known as a boundary layer.
- A no-slip boundary condition is created as a result of the fluid and wall interaction (zero velocity at the wall).
- After that, the flow velocity above the surface steadily rises until it reaches the bulk flow velocity again.
- The term "velocity boundary layer" refers to the thin layer of fluid whose velocity has not yet recovered to that of the main flow.
The turbulent boundary layer has swirls or "eddies," whereas the laminar boundary has a fairly smooth flow.
- Laminar flow is less stable than turbulent flow but produces less skin friction drag.
- The area of a predominantly turbulent flow that is close to a no-slip boundary and where viscous shear stresses play a significant role is known as the laminar sublayer, also known as the viscous sublayer.
Know more about boundary layer with the help of the given link:
brainly.com/question/16237965
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