A negative electric discharge voltage generator (NAI Generator) was designed and used to investigate the possibility of reducing (neutralizing) fog, dhoop smoke, and vehicle smoke collected in closed glass containers. The experiment was carried out in a dark room, and two identical glass containers were used. Various sensitivity tests were carried out with fog and smoke. Light intensity was measured for each run as a function of time with and without a negative air ion generator. Negative air ions attach to particulate matter to enhance visibility. At a high negative ion emission rate, the particle mobility becomes sufficient so that particle migration results in their deposition on walls and other indoor surfaces. The performance characteristics of the negative electric discharge generator designed in this work, which produces uni-polar ions by corona discharge at a relatively high emission rate, were evaluated. This device, if operated continuously for six minutes, resulted in the removal of about 93% to 97% of the particles in the glass container, in addition to the natural decay effect. The rate of change of particle removal was higher for fog than for smoke. This study demonstrates that it is possible to neutralize and reduce the concentration of fog and smoke to a significant degree using negative air ions, resulting in increasing visibility in a closed chamber.
This study investigates the possibility of corona discharge ionization technique for reduction of fog. For corona discharge ionization a high voltage power supply is designed and developed indigenously. The high output voltage is developed by using isolation transformer, autotransformer, and high voltage neon transformer and it is converted into DC voltage by using Wheatstone bridge circuit and high voltage capacitor. Formation of negative corona, positive corona and voltage-current characteristics of corona ionization was studied. By selecting-9 kV voltages to discharge electrode, the performance of this circuit was tested for removal of fog, Fog was generated by using ultrasonic water fogger collected in closed glass container. Various runs were carried out. The light intensity was measured for each run as a function of time, in presence and absence of the discharge. After continuous operation of device for 6 minutes, 90% to 95% of the aerosols were removed from container in addition to the natural decay effect.
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