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7. Noncircular Ducts. Air at standard conditions ( = 1.23kg/m3;=1.79105Pas) flows through a 12m2 rectangular smooth-walled duct with an average velocity of 9m/s. What is

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7. Noncircular Ducts. Air at standard conditions ( = 1.23kg/m3;=1.79105Pas) flows through a 12m2 rectangular smooth-walled duct with an average velocity of 9m/s. What is the head loss per unit length? [g=9.81m/s2.] Ans. 0.0372

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