3. A useful dimensionless number is the Reynolds number, Re: DUp Re = where: D = diameter or length U = a characteristic velocity p= fluid density u= fluid viscosity Calculate Re for the following cases: a b D 3/8 in. 120 μη U 2.3 ft.s1 280 mm-s1 18.9 Ibm-ft3 2.65 g-cm3 4.84 Ibm-h1-ft1 1.02 x 103 Pa-s

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