Falling sphere viscometry

Sutterby, J. L. Trans. Soc. Rheol. 17 (1973) 559. Falling sphere viscometry. I. Wall and inertial corrections to Stokes law in long tubes. 

For falling sphere viscometry, it is most convenient to define a viscosity ratio based on constant particle dimensions and terminal velocity (S7) ... 

Sutterby (S7) gave a useful tabulation of the viseosity ratio, defined in Eq. (9-8), for relatively low Re and a. These values, intended primarily to correct for departures from Stokes law in falling sphere viscometry, are shown in Fig. 9.6. Reynolds number is defined using the measured Uj and defined in Eq. (9-9). The curve for a = 0 accounts for departures from the creeping flow approximations in an unbounded fluid, and the relative displacement of the other curves indicates the wall effect. 

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