Ejercicio 1 Fluidos Ii.docx

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1) En un flujo establecido en una tubería de 12´´ (0.30m) de diámetro, la velocidad en el centro es de 3 m/s y la velocidad a 7.5 cm de la línea central es 2.685 m/s .(Agua a 25°C y material acero ).Identificar: 𝛖 = 1.007 x 10-6 m2/s d=0.30 m v= 3 m/s a) b) c) d) Solución:

Si el flujo es laminar o turbulento Si la pared es hidráulicamente lisa o rugosa Coeficiente de fricción Descarga

a) 𝑅𝑒 =

𝑉.𝐷 υ

3 𝑥 0.3

𝑅𝑒 = 1.007 x 10−6 Re = 893743.8

Flujo Turbulento

560𝑥𝐷 𝑅𝑒

b)

K≥

560𝑥0.3 893743.8

Flujo hidráulicamente rugoso

0,0024≥

0,0024≥0.00019 C)

1 √𝑓

𝐷

= 2log(3.71𝑥 ) 𝐸

f=0.035 d) Q = V . A Q=3x

𝜋𝑥0.32 4

Q = 0.212 m3/s

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