An electrostatic precipitator (ESP) is known to have high efficiency in removing particulate matter. But the efficiency of ESP is vulnerable to the flow distribution in collection area. Since space is worthy in the field, a wide-angle diffuser is applied to ESP. When a diffuser has a large divergence angle, an axial-flow jet is formed and results in a large region of separated flow near diffuser walls. This leads to non-uniform flow distribution in the collection area and lowers the particle collection efficiency of ESP. Therefore, perforated plate is usually applied to ESP for uniformization of flow. In this study, it was studied that several kinds of perforated plate effect on pressure loss of fluid flow. We tested in square duct designed with a length of 3.5 m and a diameter of 0.093 m. Perforated plates with various porosity and pore size were used to experiment. Correlation between resistance coefficient and pressure loss was also found in this study.
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