Abstract
Solid particles of different sizes which are contained within a liquid jet can be sorted by utilizing electrostatic forces. In our previous experiments, four different but known sizes of particles were separated into groups with high efficiency. However, for large particles of 20μm, the separation efficiency was less than for smaller sizes. In order to investigate the reason for this lowered efficiency, particle velocities within the inner flow were measured by using a diffraction grating. These measurements revealed that the particle velocity is not constant in the column, but is faster near the nozzle. The velocity distribution inside the jet column, which consists of an inner and an outer flow, was also measured. The result, indicating the outermost velocity near the nozzle is slowest, can be used in particle sorting by modifying the delay time to improve separation efficiency.
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