Aerosol deposition in a pipe with turbulent airflow
TL;DR: In this paper, a wind tunnel was constructed to establish completely developed turbulent flow in a 6-in. pipe in which an aerosol was moving under turbulent flow conditions, and Reynolds Numbers were as high as 367,000.
About: This article is published in Journal of Aerosol Science.The article was published on 1970-08-01. It has received 78 citations till now. The article focuses on the topics: Deposition (aerosol physics) & Aerosol.
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TL;DR: In this article, the deposition rate of aerosol particles in turbulent flow has been measured in vertical pipes for nominal Reynolds numbers of 10,000 and 50,000, and for particle dia. of 1·4-21 μm using monodisperse aerosols generated by the vibrating orifice of a monodiscriminative aerosol generator.
547 citations
TL;DR: In this article, a series of numerical simulations were conducted to study the transport and deposition of nano- and micro-particles in a turbulent duct flow using different turbulence models, and the importance of turbulence model, boundary conditions, and turbulence fluctuation particularly near wall on particle transport, deposition, and particle trajectory analysis were performed with the in-house PARTICLE (object-oriented C++) code, as well as with FLUENTTM code with and the use of user's defined subroutines.
324 citations
TL;DR: In this article, a simple analytical method is presented for calculation of deposition to both smooth and rough surfaces, and the main analysis is given for sublayer scale roughness, and approximations are given which indicate simple scaling laws for the process.
295 citations
TL;DR: In this paper, a review of the present knowledge of aerosol dry deposition, with respect to modelling and experimental aspects, is presented, and a synthesis is provided through different inter-comparisons concerning: (1) the influence of atmospheric stability on fine particle deposition, (2) the evolution of coarse aerosol deposition with aerodynamic conditions and (3) the aerosol size dependence of deposition on grass and forest canopies.
288 citations
Cites background from "Aerosol deposition in a pipe with t..."
...Roughness influence on turbulent deposition has been studied in the case of dynamically smooth surfaces, i.e. h+o5 (Montgomery and Corn, 1970; Wood, 1981; Fan and Ahmadi, 1993)....
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TL;DR: In this paper, measurements of the deposition rate with the goal of outlining their present ability to predict this quantity for annular two-phase flows are presented. But they do not consider the effect of the number of droplets in a turbulent flow on surrounding surfaces.
202 citations
References
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01 Jan 1951
TL;DR: This is an introduction to current methods of instrumental analysis and a reference for the future, including coverage of such topics as chemometrics, robotics, laboratory information management systems and the role of instrumentation in the overall analytical method.
Abstract: This is an introduction to current methods of instrumental analysis and a reference for the future. Changes have been made to this 7th edition, including coverage of such topics as chemometrics, robotics, laboratory information management systems and the role of instrumentation in the overall analytical method. There is expanded treatment of graphite furnace AA, ICP and DCP, Fourier transform instruments, hyphenated methods, ion chromatography and photoacoustic spectroscopy. An illustrated discussion of the role of the computer in current instrumentation and laboratories is included.
1,197 citations
580 citations
TL;DR: In this paper, the deposition on smooth surfaces by impaction from turbulent flow was compared with theoretical predictions, and the results were in accordance with the empirical law relating transport to the two-thirds power of the diffusivity of the particle.
Abstract: Radioactive particles have been used to study deposition from airstreams on to vertical surfaces. Polystyrene spheres 5 μm in diameter incorporating 51Cr, tri-cresyl-phosphate droplets 21, 11 and 065 μm in diameter with 32P activity, and natural Aitken nuclei tagged with ThB (212Pb) were used. The deposition on to smooth surfaces by impaction from turbulent flow was compared with theoretical predictions. Deposition by Brownian motion was also important for the smaller particles, and the results were in accordance with the empirical law relating transport to the two-thirds power of the diffusivity of the particle. When the deposition surface was covered with filter paper it remained aerodynamically smooth, but the deposition of particles was greatly increased since roughness elements too small to disturb the viscous boundary layer of the airflow are nevertheless effective in removing particles from it.
204 citations