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Fluid mechanics: coefficient of discharge for an external mouthpiece For a sharp-edged external mouthpiece (running free), identify the standard coefficient of discharge value used in calculations. Choose the correct numerical value.

Difficulty: Easy

0.375
0.5
0.707
0.855

Correct Answer: 0.855

Explanation:

Concept/Approach
The coefficient of discharge C_d for an external mouthpiece (free discharge) is empirically established around 0.85–0.86 for water at normal conditions. This accounts for contraction and velocity effects at the mouthpiece.

Final Answer
0.855

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