The pressure drop between the entrance and exit of a 150- mm-diameter 90° elbow, through which ethyl alcohol at 20 °C is flowing, is to be determined with a geometrically similar model. The velocity of the alcohol is 5 m/s. The model fluid is to be water at 20 °C, and the model velocity is limited to 10 m/s. (a) What is the required diameter of the model elbow to maintain dynamic similarity?

(b) A measured pressure drop of 20 kPa in the model will correspond to what prototype value?

 

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