Discussion
Consider the following statements about a turbulent boundary layer:
1. Its skin friction is higher than that of a laminar layer at the same Reynolds number.
2. It resists separation better than a laminar layer.
3. It grows more slowly along the surface than a laminar layer.
Which of the statements given above is or are correct?
Answer: B
The first two are correct and between them define the standing trade. The third is reversed: a turbulent layer thickens roughly as distance to the four-fifths against the laminar half-power, so it grows considerably faster.
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