The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
Correct answer: D. Transition
- A. Equivalent
- B. None of these
- C. Prandtl mixing
- D. Transition
Explanation
The entrance or transition length is the distance required for the developing boundary layers to meet at the pipe centre and produce a fully developed velocity profile. This distinguishes it from Prandtl’s mixing length, which is a turbulence concept.
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