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Problem 4.20 [Difficulty: 1] Given: Data on flow through nozzles Find: Average velocity in head feeder; flow rate Solution: Basic equation CS V → A →⋅( )∑ 0= Assumptions: 1) Steady flow 2) Incompressible flow 3) Uniform flow Then for the nozzle flow CS V → A →⋅( )∑ Vfeeder− Afeeder⋅ 10 Vnozzle⋅ Anozzle⋅+= 0= Hence Vfeeder Vnozzle 10 Anozzle⋅ Afeeder ⋅= Vnozzle 10⋅ Dnozzle Dfeeder ⎛⎜⎝ ⎞ ⎠ 2 ⋅= Vfeeder 10 ft s ⋅ 10× 1 8 1 ⎛⎜⎜⎝ ⎞ ⎠ 2 ×= Vfeeder 1.56 ft s ⋅= The flow rate is Q Vfeeder Afeeder⋅= Vfeeder π Dfeeder 2⋅ 4 ⋅= Q 1.56 ft s ⋅ π 4 × 1 in⋅ 1 ft⋅ 12 in⋅× ⎛⎜⎝ ⎞ ⎠ 2 × 7.48 gal⋅ 1 ft3⋅ × 60 s⋅ 1 min⋅×= Q 3.82 gpm⋅=
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