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Fundamentals of single particle transport.
Kulkarni PS; Baron PA; Willeke K
Aerosol measurement: principles, techniques, and applications, third edition. Kulkarni P, Baron PA, Willeke K, eds. Hoboken, NJ: John Wiley and Sons, Inc, 2011 Jan; :15-30
Understanding aerosol transport, that is, how the aerosol particles move in space, is of fundamental interest in design of all aerosol instruments and devices. Virtually every measurement technique described in this book exploits a certain characteristic transport property of particles to alter their behavior to achieve a measurement objective. The aerosol consists of two components: the particles and the gas (usually air) in which they are suspended. At a microscopic level, each particle modifies the gas flow over and around it through its own physical properties which, in turn, affects the drag force acting on it. On the other hand, at a macroscopic level, it is the fluid-flow gas flow characteristics that may determine how the particle is transported from one point to the other or how it deposits on a surface. To understand aerosol transport, it is essential to understand the basic physical concepts of fluid flow in which the particle is suspended, the interaction of a single particle with the gas surrounding it, and how the particle behaves in response to various external forces acting on it. This chapter introduces the basic framework to describe gas and particle motion.
Aerosol-particles; Aerosols; Aerosol-sampling; Respiratory-system-disorders; Particulate-dust; Particulate-sampling-methods; Particle-aerodynamics; Sampling; Sampling-methods; Measurement-equipment; Indoor-air-pollution; Indoor-environmental-quality; Author Keywords: single particle transport fundamentals; aerosol transport; aerosol particles moving in space; slip flow regime; aerosol system; small particles at atmospheric pressure; larger particles at local static pressures; lower particle migration in external force fields; gravitational force field migration
Kulkarni P; Baron PA; Willeke K
Aerosol measurement: principles, techniques, and applications, third edition
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division