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Reynolds number R_e for tube flow:
Aρgh/η
Bρvd/η
Cvd
Dη/ρ
Answer & Solution
Correct answer: B. ρvd/η
R_e = ρvd/η (dimensionless). R_e < 2000: laminar. R_e > 4000: turbulent. Critical R_e: regime depends on geometry. Used to determine flow regime.
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