Evaluation of a Rotating Disk Apparatus:Drag of a Disk Rotating in a Viscous Fluid.

摘要

A rotating disk apparatus,designed to attain high shear stresses comparable to those about hulls of full-scale ships is evaluated. Shear stresses were not measured but were inferred from measurements of disk moments. Two disk surfaces were evaluated,hydraulically smooth and sandpaper rough. For the smooth and rough surface disks in air,the experimental moment coefficients were generally greater than the theoretical predictions. Only the smooth surface disk in water gave results lower than predictions. (Modified author abstract)