The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?
Correct answer: A. 0.3
- A. 0.3
- B. 0.9
- C. 0.03
- D. 0.66
Explanation
Maximum mean velocity occurs when the hydraulic radius is maximised for the circular open channel, giving approximately R/D = 0.30. The value 0.9 refers roughly to the depth-to-diameter ratio, not the asked ratio.
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