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4 CHAPTER 9. VISCOUS FLOW<br />
x<br />
2<br />
x<br />
2<br />
x<br />
3<br />
x<br />
x<br />
1<br />
x<br />
1<br />
(a)<br />
(b)<br />
Figure 9.1: When the force exerted on the fluid is reversed, the fluid velocity<br />
is reversed at all points in Stokes <strong>flow</strong>.