Abstract
The 1st paper dealt with a study of laminar flow of fluid in the clearance space between the gear tip and the casing, and gave the optimum gap of clearance suitable for the minimum shearing resistance to the motion of gear tip and the maximum discharge through it. The 2nd paper treated the turbulent flow, which may be set in the clearance by the intermittent sweep of a gear tip. It was concluded that : (1) If the mixing length of turbulence is unchanged irrespective of the change of clearance, we have the similar optimum clearance. (2) If the mixing length is changed in proportion to the gap of clearance, the result becomes different. We have such an optimum suitable for the maximum ratio of the water power given by the clearance and the required power for driving the gear tip.
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