In turbulent flow theory, the Prandtl mixing length is defined as:

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The average normal distance from the boundary over which fluid elements exchange momentum with the main flow

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Answer 1

The ratio of particle mean free path to a reference dimension of the flow

Answer 2

The characteristic wavelength corresponding to the smallest frequency present

Answer 3

The average normal distance from the boundary over which fluid elements exchange momentum with the main flow

Answer 4

The measure of turbulent kinetic energy per unit mass

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