A straightforward, explicit equation was developed previously to estimate an “equivalent” velocity in the rotating cylinder electrode that might best simulate the velocity in a pipe. That equation used friction factor vs Reynolds number relationships valid to Reynolds numbers of ∼105. A similarly straightforward, explicit equation has been derived here that extends the estimate to much higher Reynolds numbers. Use of more complicated alternative equations while being more exact have been more difficult to use, requiring iteration to calculate the velocity. The equation reported here enables a reasonable estimate of the cylinder velocity to be calculated directly from the pipe velocity at higher Reynolds numbers without the need for iteration.

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