This technical brief presents experimental results for the drag on a circular disk moving at terminal velocity through a viscous fluid midway between parallel plane walls. The axis of the disk is oriented perpendicularly to these walls. The notation is shown in Fig. 1. A circular disk of diameter d and thickness t moves edgewise with a velocity U through a viscous fluid of density ρ and viscosity μ midway between two plane walls that are parallel to the plane of the disk. The distance between the parallel walls is D. Define the aspect ratio of the disk as A=td and the Reynolds number as Re=dρUμ. I will assume that the flow is a Stokes flow (Re1) and that the disks are...

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