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What is the mixing length for the outer layer of a 2-D turbulent boundary layer?

What is the mixing length for the outer layer of a 2-D turbulent boundary layer? Correct Answer 0.09 times the boundary layer thickness

For a turbulent boundary layer problem, the mixing length varies for different layers of the flow. For the 2-D case, the mixing length of the outer boundary layer is 0.09 times the boundary layer thickness.

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