Stokes Law and Noncontinuum Effects Slip Correction Factor

2 Stokes Law and Noncontinuum Effects Slip Correction Factor 

Stokes law is based on the solution of equations of continuum fluid mechanics and therefore is applicable to the limit Kn — 0. The nonslip condition used as a boundary condition is not applicable for high Kn values. When the particle diameter Dp approaches the same magnitude as the mean free path X of the suspending fluid (e.g., air), the drag force exerted by the fluid is smaller than that predicted by Stokes law. To account for 

TABLE 9.2 Reynolds Number for Particles in Air Falling at Their Terminal Velocities at 298 K 

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