Air flows from a pipe into the region between two parallel circular disks as shown in Fig. P4.51. The fluid velocity in the gap between the disks is closely approximated by \(V=V_{0} R / r\), where \(R\) is the radius of the disk, \(r\) is the radial coordinate, and \(V_{0}\) is the fluid velocity at the edge of the disk. Determine the acceleration for \(r=1,2\), or \(3 \mathrm{ft}\) if \(V_{0}=5 \mathrm{ft} / \mathrm{s}\) and \(R=3 \mathrm{ft}\).

Figure P4.51

Disks R- Pipe V