Determine the pipe length l, at which the emptying of t

Determine the pipe length l, at which the emptying of the cylindrical tank with a diameter D to a depth H will be twice as slow as through an opening of the same diameter d. The coefficient of hydraulic friction in the pipe adopted λ = 0,025.
Indication In the formula for determining the time of emptying the tank, the flow coefficient μ of the exhaust device is determined by its design. For pipe
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