Question: 7 . 2 3 . Air at 2 5 C can exist in either the laminar state or the turbulent slate ( a trip wire

7.23. Air at 25 C can exist in either the laminar state or the turbulent slate (a trip wire near the entrance is used to make it turbulent) for flow in a 60-mm-dameter pipe in a research lab. If the average velocity is 5 m/s. compare tha length of the entrance region for the laminar flow with that of the turbulent flow.

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