AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Effect of Particle and Filter Charges on Particle Loading Characteristics of Air Filter Media
Hyun-Seol Park, WEONGYU SHIN, Korea Institute of Energy Research
Abstract Number: 411 Working Group: Control Technology
Abstract Applications of electrostatic force into aerosol filtration have been utilized for enhancing the collection efficiency of air filter without increasing the pressure drop across the filter. Electrostatic forces acting between particles and filter media make an effect on transient filtration properties with particle loading as well as initial filtration efficiency. In this study, we have examined the effect of partcle and filter charges on particle loading characteristics of air filter media. Particle deposition pattern on filter fibers is changed by types of electrostatic forces and the intensity of each electrostatic force. The changed pattern affects the filtration performance, especially on the pressue drop. In this work, two filter charge states and three particle charge states were used as test conditions. One filter is a commercial electret filter medium which is corona-charged. The other is the same filter except that the filter charge is removed by dipping the commercial charged filter into IPA for a few minutes and drying. Electrically neutral particles(uncharged particles), particles having Boltzmann equilibrium charge distribution, and highly charged particles by a corona charger were loaded on each of test filter media, respectively. There was big difference of areal mass loading to reach 500Pa of pressure drop between highly charged particle case and the others regardless of filter charge. It was also found that the corona charged particles formed much porous structure of deposit while the neutralized and uncharged particles were deposited in a pattern of evenly packed structure on the face of filter media. The porous pattern of corona charged particles made much lower pressure drop across filter media for the same areal mass loading compared to other cases. The filter charge made only slight difference in the pressure drop, thus it was negligible compared to the effect of corona charged particles.
This research was supported by the Converging Research Center Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology.