Abstract
The collection efficiency of charged water droplets of 500 μm diameter for charged particles of 0.2 μm diameter is examined as a function of the nondimensional Coulombic parameter. The present paper provides an experimental technique to determine the contribution of the phoretic forces in particle collection by comparing the collection efficiencies of water droplets to that of oil droplets for which the vapor pressure and the phoretic forces are negligible. Reasonable agreement is obtained between the experimental data and the values predicted by a collection efficiency model considering only Coulombic force, thermophoresis and diffusiophoresis.
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