AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Charge Decay of Electret Filters with Various Surface Charge Densities by Liquid Isopropyl Alcohol Exposure
EUN-SEON PARK, Myong-Hwa Lee, KITECH
Abstract Number: 258 Working Group: Control and Mitigation Technology
Abstract Electret filters have high collection efficiency due to the electrostatic attraction between charged fibers and particles even at the low pressure drop. However, the electret filters exposed to organic solvents led to drastic decrease in their collection efficiencies. Therefore, it is important to understand the charge decay mechanisms in the electret filter in order to extend the filter lifetime. Various electret filters were exposed to liquid isopropyl alcohol and their collection efficiency changes were investigated as functions of surface charge densities and physical structures of the filters in this study. The surface charge densities of the test electret filters were determined theoretically from the single fiber collection efficiencies by induced force and mechanical forces. In addition, the challenged amounts of isopropyl alcohol required to neutralize the test electret filters with various surface charge densities were compared.