(Answered) The flow of 20-c water in a 2-cm-diameter pipe oscillates

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The flow of 20-C water in a 2-cm-diameter pipe oscillates between being laminar and turbulent as it flows through the pipe from a reservoir. Estimate the inviscid core and the entrance lengths

(a) if the flow is laminar and the average velocity is 0.15 m=s, and

(b) if the flow is turbulent and the average velocity is 0.6 m=s.

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