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Corona onset voltage is one of the most important factors that determine the charging toxic particle in an industrial application. Electrostatic precipitators (ESP) remove the suspended particle with a gas inlet. This paper developed Peek's formula to estimate the maximum electric field near the discharge wire in corona discharge models, the values of maximum electric field and corona onset voltage near the discharge wires have been calculated for different values of pressure and temperature for confined gas in a region between the electrodes in ESP. The model uses finite difference method (FDM) to solve governing equations (Poisson’s and current continuity equations) simultaneously. Computer simulation method uses FORTRAN program to estimate potential distribution and maximum electric field intensity. The calculated corona onset voltage values are compared with the calculated values of different models.        Key words: Corona onset voltage, corona discharge, electric field distribution, electrostatic precipitators.

Pressure and temperature effects on corona onset voltage in electrostatic precipitators