Problem 2.87 - Re V D = 2300 = for transition to turbulence...

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Problem 2.87 [Difficulty: 2] Given: Data on water tube Find: Reynolds number of flow; Temperature at which flow becomes turbulent Solution: Basic equation For pipe flow (Section 2-6) Re ρ V D μ = VD ν = At 20 o C, from Fig. A.3 ν 91 0 7 × m 2 s = and so Re 0.25 m s 0.005 × m 1 91 0 7 × × s m 2 = Re 1389 = For the heated pipe
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Unformatted text preview: Re V D = 2300 = for transition to turbulence Hence V D 2300 = 1 2300 0.25 m s 0.005 m = 5.435 10 7 m 2 s = From Fig. A.3, the temperature of water at this viscosity is approximately T 52 C =...
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