Stokes’ law region

TABLE 6-9 Wall Correction Factor for Rigid Spheres in Stokes Law Region... 

For settling in the Stokes law region, the velocity is proportional to the diameter squared and hence the time taken for a 40 pm particle to fall a height li m is ... 

For particles settling in the Stokes law region, equation 3.32 applies ... 

It may be noted that the equations of motion for the two directions (X and F) are coupled, with x and y appearing in each of the equations. General solutions are therefore not possible, except as will be seen later for motion in the Stokes law region. 

For a spherical particle in a fluid, the equation of motion for the Stokes law region is ... 

Figure 6.9. The possibility of inversion (a) Stokes law region (b) Newton s law region1-38)...

Because centrifuges are normally used for separating fine particles and droplets, it is necessary to consider only the Stokes law region in calculating the drag between the particle and the liquid. 

Eq. (2a) applies to low-flow (or low panicle Revnolds number. cases (the Stokes law region—i.e.. sub-senpt s). Eq. (2b) applies to high-flow cases (the transition region). These two regions, with panicle sizes of 3 microns (pm) and larger, are of concern in practical drum separator design. 

The Stokes law region applies for the settling particles. Therefore,... 

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