Diffusion Charging of Aerosol Particles by Ions and Free Electrons PDF Download
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Author: Francisco Javier Romay
Publisher:
ISBN:
Category :
Languages : en
Pages : 356
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Author: Francisco Javier Romay
Publisher:
ISBN:
Category :
Languages : en
Pages : 356
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Author: You-Hong Pui
Publisher:
ISBN:
Category :
Languages : en
Pages : 466
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The electrical charging of aerosol particles by unipolar gaseous ions was studied theoretically and experimentally. The primary objective of the study was to make precise determinations of the aerosol particle charge under various conditions of charging and to compare the experimental results with those predicted by theory. Experiments were performed using monodisperse oleic acid aerosols generated by a vibrating orifice generator, monodisperse NaCl and DOP (di-octyl phthalate) aerosols generated by an electrostatic classification method, and sulfuric acid aerosols generated by the photo-chemical conversion of gaseous SO2 in the smog chamber. The experiments covered a particle size range of 0.0075 .mu.m to 5.04 .mu.m diameter. The corresponding range in Knudsen number (Kn = lambda/sub i//a, lambda/sub i/ = mean free path of ions, a = particle radius) was from 0.0056 to 3.86. The charging parameter, n0t, was varied between 2.56 x 106 to 5.1 x 107 ion-s/cc, where n0 is the concentration of ions and t is the charging time. Comparisons of the results with available aerosol charging theories indicate that there is reasonable agreement between the theory and experiment in the continuum regime (Kn “1) where the classical Fuchs--Pluvinage equation is expected to apply. However, in the free molecular (Kn” 1) and the transition regimes (Kn approx. or equal to 1), where the ion mean free path is no longer small in comparison with particle size, there is considerable discrepancy between the experimental data and available charging theories. A semi-empirical equation was developed which agrees well with the experimental data over the entire range of particle size and charging parameters covered in the experiments. Theoretical results are presented showing the distribution of charges on the particles as a function of particle size and the charging parameter n0t. 70 figures, 24 tables, 112 references. (auth).
Author: Bruce Riley Forsyth
Publisher:
ISBN:
Category :
Languages : en
Pages : 584
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Author: Fadejimi Bademosi
Publisher:
ISBN:
Category :
Languages : en
Pages : 310
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Author: LI LI
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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The particle electric charge distribution plays a critical role in electrical mobility measurements of nanoparticle size distribution functions, where it is usually estimated by empirical regression equations. However, there are still lack of methods to accurately calculate nanoparticle-ion collision rates in the presence of strong attractive potentials and to calculate aerosol particle charge distributions with detailed consideration of ion properties. This dissertation consists of three main parts and aims to address the pending issues. The main purpose is to obtain a precise prediction on the aerosol particle charge under various conditions of charging, along with the collision kernel expressions developed and validated. Chapter 2 develops a diffusion charging collision kernel model for attractive Coulombic and image potential interactions between ion and particles. Chapter 3 extends the prior developed model to include the influence of particle. Chapter 4 demonstrates a modeling approach to calculate particle charge distribution through a non-thermal plasma and afterglow. This dissertation presents the theoretical results showing the calculation of the distribution of charges on aerosol particles as a function of particle mobility size and the simulated results are tested by comparison with experimental results. Specifically, comparison with the data of Gopalakrishnan et al. (2015a) with entire ion mass-mobility distribution shows good agreement with predictions of the Langevin Dynamics (LD)-based model, thereby indicating the capability of model to accommodate multi-ion populations and arbitrary shapes of particles. We successfully validated the ability of LD-based simulations to accurately predict rate constants for collision processes in physical systems..
Author: George M. Hidy
Publisher: Pergamon
ISBN:
Category : Science
Languages : en
Pages : 176
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Author: Soo Hyung Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
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Author: Kaisheng Yu
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 184
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Author: Pramod Kulkarni
Publisher: John Wiley & Sons
ISBN: 1118001672
Category : Science
Languages : en
Pages : 1497
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Book Description
Aerosol Measurement: Principles, Techniques, and Applications Third Edition is the most detailed treatment available of the latest aerosol measurement methods. Drawing on the know-how of numerous expert contributors; it provides a solid grasp of measurement fundamentals and practices a wide variety of aerosol applications. This new edition is updated to address new and developing applications of aerosol measurement, including applications in environmental health, atmospheric science, climate change, air pollution, public health, nanotechnology, particle and powder technology, pharmaceutical research and development, clean room technology (integrated circuit manufacture), and nuclear waste management.
