By Pramod Kulkarni, Paul A. Baron, Klaus Willeke
Aerosol dimension: ideas, recommendations, and purposes 3rd variation is the main particular therapy to be had of the most recent aerosol size tools. Drawing at the information of various specialist individuals; it offers a superb take hold of of dimension basics and practices a large choice of aerosol applications.
This re-creation is up to date to handle new and constructing functions of aerosol size, together with purposes in environmental well-being, atmospheric technological know-how, weather swap, pollution, public health and wellbeing, nanotechnology, particle and powder expertise, pharmaceutical learn and improvement, fresh room know-how (integrated circuit manufacture), and nuclear waste management.
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Additional resources for Aerosol Measurement: Principles, Techniques, and Applications
If the unit of atmosphere is used for pressure, the factor of 101 used in Equation 2-10 is substituted by one. The factor of 110 (K) is the Sutherland constant and the value changes for different gases. The mean free path and the average molecular velocity are parameters that are frequently used to predict bulk properties of a gas, such as thermal conductivity, diffusion, and viscosity. Mean free paths for other gases are presented in Table 2-1. 2 Knudsen Number The Knudsen number, Kn, relates the gas molecular mean free path to the physical dimension of the particle, usually the particle radius, rp.
8 29 average velocity of a molecule particle velocity in the jet initial velocity diffusive deposition velocity drift or migration velocity in electric field particle settling velocity in gravitational field thermophoretic velocity terminal settling velocity difference in potential (volts) distance between the plates in SI units (Eq. 2-47) root mean square (rms) distance particle electrical mobility dynamic viscosity of gas reference viscosity of gas Mean free path of gas kinematic viscosity of gas gas density particle relaxation time dynamic shape factor REFERENCES Allen, M.
Willeke, K. 1976. Temperature dependence of particle slip in a gaseous medium. J. Aerosol Sci. 7: 381–387. 3 PHYSICAL AND CHEMICAL PROCESSES IN AEROSOL SYSTEMS WILLIAM C. 1 31 32 32 33 33 33 33 33 33 34 34 34 INTRODUCTION Aerosols, by their nature, are somewhat unstable in the sense that concentration and particle properties change with time. These changes can be the result of external forces, such as the loss of larger particles by gravitational settling, or they may be the result of physical and chemical processes that serve to change the size or composition of the particles.
Aerosol Measurement: Principles, Techniques, and Applications by Pramod Kulkarni, Paul A. Baron, Klaus Willeke