The evaluation of drift velocity of charged particulates in a laboratory scale electrostatic precipitator (ESP) will be discussed. The collection efficiency of an ESP depends on a large number of electrohydrodynamic parameters. The main mass transfer parameter in an ESP is the drift velocity of particulate which is determined by gravitational force, Coulomb force, drag force, inertial force of added mass, and lift force. The calculated migration velocity, using the fundamental motion equations of particles in an electrohydrodynamic field, differs very much from the effective drift velocity obtained experimentally. In the paper we develop a new concept of drift velocity calculation using the theory of dimensional analysis and the experimental data of collection efficiency in a laboratory scale ESP. As a result we obtained a universal relationship between drift velocity and a proposed ESP similarity number.
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