Stokes Cunningham correction

Fig. 4. Terminal velocities in air of spherical particles of different densities settling at 21°C under the action of gravity. Numbers on curves represent tme (not bulk or apparent) specific gravity of particles relative to water at 4°C. Stokes-Cunningham correction factor is included for settling of fine particles.

Stokes-Cunningham correction factor sphericity correction constant Coulomb s law constant, 8.987 x 10 ... 

Stokes-Cunningham correction foctor is included for fine particles settling in air. 

K. Stokes-Cunningham correction factor Dimensionless Dimensionless Dimensionless... 

For single-stage precipitators, and may be considered as essentially equal. It is apparent from Eq. (17-31) that the mobihty in an elecdric field will be almost the same for all particles smaller than about l- Im diameter, and hence, in the absence of reentrainment, collection efficiency should be almost independent of particle size in this range. Very small particles will actually have a greater mobihty because of the Stokes-Cunningham correction factor. Values of are listed in Table 17-14 for 70°F, = 2, and % = %i = % = 10 statV/cm. 

Kcr = Proportionality Foctor, Dimensionless Km = Stokes-Cunningham Correction Factor, Dimensionless... 

Kfne = Proportionality factor in Stokes-Cunningham correction factor, dimensionless k = Constant for wire mesh separators 1 = Wire mesh thickness, ft L = Length of vessel from hydrocarbon inlet to hydrocarbon outlet, or length of decanter, ft L[ = Liquid entering Webre separator, lbs pel- minute per square foot of inlet pipe cross-section L, = EnLrainment from Webre unit, lb liquid per minute per square foot of inlet pipe cross section... 

FIG. 14-115 Experimental collection efficiencies of rectangular impactors. C is the Stokes-Cunningham correction factor pp, particle density, g/cm3 Ug, superficial gas velocity, approaching the impactor openings, cm/s and g, gas viscosity, P. [Calvert, Yung, and Leung, NTIS Publ. PB-248050 based on Mercer and Chow, J. Coll. Interface Sci., 27, 75 (1968).]... 

A constant in Stokes-Cunningham correction factor for particle velocity7 . 41.72, but often considered a function of X and D dimensionless... 

Stokes-Cunningham correction factor for terminal settling velocity Elooding coefficient Discharge coefficient Diameter Bubble diameter Hole diameter Orifice diameter Cut size of a particle collected in a device, 50% mass efficiency Mass median size particle in the pollutant gas... 

Stokes-Cunningham correction factor Thickness of fibrous filter or of dust layer on surface filter... 

This correlation should be combined with the Stokes-Cunningham correction, which considers slip as continuum laws for drag breakdown for very small particles under certain operating conditions. 

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