Intermediate law

Fig. 14. Drag coefficient for terminal settling velocity correlation (single particle) where A represents Stokes law B, intermediate law and C, Newton s...

Dust venting nomographs, 514-520 Calculations, 513-517 Dust, mist calculations, 226-236 Brownian movement, 226. 236 Drag coefficients, chart, 235 Intermediate law, 226 Newton s law, 226, 228... 

Note on Fig. 2 that there are four laws from which settling rates may be calculated depending upon the system and the particle diameters. In the order of decreasing particle diameters, they are Newton s law. Intermediate law, Stokes law, and Stokes-Cunningham law. 

Viscosity affects the various mechanisms of separation in accordance with the appropriate settling law. Tor instance, viscosity has no effect on terminal velocities in the range where Newton s law applies except as it affects the Reynolds Number which determines which settling law applies. Viscosity does affect the terminal velocity in both the Intermediate law range and Stokes law range as well as help determine the Reynolds Number. As the pressure increases or the temperature decreases the viscosity of the gas increases. Viscosity becomes a large factor in very small particle separation (Intermediate and Stokes law range). 

Since 3.3 < 5.39 < 43.6, the intermediate law is valid for the larger particle size. Therefore, the particle size range is... 

Since the particle Reynolds number is within the intermediate law limits, we accept the velocity calculated. 

The valne of Rep is within the intermediate law regime therefore, we accept the settling velocity calculated. 

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