Continuum regime bipolar spherical aerosol particle charging /
| Main Author: | |
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| Other Authors: | , , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | Experiments were conducted on particles in the 0.3 to 13.0 μm size range to characterize the continuum regime charging of spherical aerosols by bipolar gaseous ions and to evaluate the theoretical models for the charging process. Particles with zero and nonzero initial charge were exposed to countercurrents of bipolar air ions in a flow-through charging apparatus in the presence of an external electric field. The ratio of positive ion conductivity to negative ion conductivity. γ was varied from 3 to x, and the dimensionless charging electric field strength was varied from 0.3 to 20. Mean charge and standard deviation were measured either with integral mobility analyzer having an optical particle detector or with a microscope-video system. The predicted mean charges given by field-diffusion theory agree well with experimental results under both unipolar and bipolar charging conditions. The effect of dielectric constant on the particle charging process was verified. When an error correction was used, the values of measured standard deviations were very close to the results given by a birth-death equation. An empirical method accurate within 4%, relaxed summation, was created to simulate continuum field-diffusion theory which simplifies the particle charge evaluation procedure. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Mechanical engineering." |
| Physical Description: | xi, 140 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |