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http://dx.doi.org/10.3795/KSME-B.2003.27.6.677

The Unipolar Charging Characteristics of Submicron Particles by Using an Indirect Photoelectric Charging  

Choi, Young-Joo (한국과학기술원 기계공학과 입자공학연구실)
Kim, Sang-Soo (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.6, 2003 , pp. 677-684 More about this Journal
Abstract
A new unipolar aerosol charger was developed by using an indirect photoelectric charging. The charger consists of two coaxial tubes, the inner UV lamp wrapped with stainless mesh and the outer Al cylinder. In this study, the effects of flow rate, particle size, and electric field were examined to search the optimal charging conditions with experimental and numerical methods. Monodisperse NaCl particles were fed into an annular space and the particles were charged by negative ions generated from Al plate exposed to the UV light. According to experimental results, the average number of elementary charge on particles increases from 2.5 to 5.5 as particle size increases from 50nm to 130nm at 2.5 L/min and 100V. The average number of elementary charge on particles was maximized at 25V as the electric potential between the stainless mesh and Al plate was varied from 0V to 400V.
Keywords
Indirect Charging; Photoelectric Charging; Unipolar Charger; Submicron particle;
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