UNCLASSIFIEL orces the welocity is the vector sum of the velocities given bv (7) and. For particles subjected to elsctrostatic and gravitational (3) corrected by equation (Ll). [fe Laws Governing the Charging of Particles Particles may acquire charges by passing rough a region containing ions of a given sign either ty diffusion or field charging. In the fbrwer, the mechanism is one of impingement of the particles with the due to the kinetic energy of the gas, whereas in the latter the imp 4s assisted by the energy imparted by the electrostatic field. (a) ent For diffusion charging, the equation given by white a xt “+ (5 a} * (+ Tacwo xt ) b gives the number of electronic charges which will be acquiled by @ particle of diameter d. (>) For field charging, Peuthenier has given the following as modified by Dallavale for a cylindrical electrostatic cipitator. . ky <1 a? g ——j Wet | ( 1 Pauthenier has shown that the potential distribution in cylinder fanction as the corona current increases from sero, exc small region around the wire. Under these conditions thq@ for & field Pa with central co-axial wire changes fron logarithmic to a Pinssr intensity will be given by = -., a v eee AEE aes od* the (¢) Sleetrical considerstions of the charger. ver 24 Es ky ; s . a ~ ) sum of the charges given by both methods, it is felt that! considering the mechanisms involwed, the particle charge will be given by the greater of the two effects. In any case, this gives a mre conservative result. + at , + aw - 1 Me] ti Although othershave asgumed that the particle will ecquifte i? tion -78~ UNCLASSIFIED o 1051099 imei 00131986.070 ee | AILS