چكيده به لاتين
Today, air pollution due to its harmful consequences, has become one of the most important environmental problems in Tehran and several other cities in Iran. Therefore, in this study, numerical simulation of microcyclone performance was performed to remove particulate matter in Tehran air. At first, the microcyclone geometry modeling and after proper and high quality grid generation, initial simulations were performed in the fluent software.The air flow and the particles in it which inside the microcyclone are according to Tehran's air quality control report in 1394 and 1395 years. The simulations showed that the microcyclon efficiency and its pressure drop increased with increasing inlet velocity, but the efficiency did not increase significantly with speeds greater than 10 m/s.Also, the comparison of the microcyclone pressure showed that at high speeds, the microcyclone pressure drop was increased extremly. Alsocomparison of the numerical simulation pressure drop results with the empirical models results showed that Shepherd and Lapple, Casal and Martinez and Coker models can predict the pressure drop in a certain speed range. However, the empirical models of Lapple and Iozia and Leith are not able to predict the microcyclone efficiency. Also, studying the effects of geometric parameters change showed that decreasing microcyclone diameter and increasing its height could increase the microcyclone efficiency by 10%. While increasing in inlet areareduces collection efficiency up to 8%. Reduction in both inlet area and microcyclone length can increase microcyclone efficiency up to 91.4% for PM2.5 and 96% for PM10 particles. While doing this geometric change, in addition to the efficiency,the amount of pressure drop also increases.
