Influence of turbulence on the deposition rate constant of the unattached radon decay products

H. Vanmarcke; C. Landsheere; Rita Van Dingenen; André Poffijn

doi:10.1080/02786829108959488

Influence of turbulence on the deposition rate constant of the unattached radon decay products

H. Vanmarcke, C. Landsheere, Rita Van Dingenen, André Poffijn

Research output › peer-review

Abstract

The deposition rate constants of the different unattached decay products of radon (²²²Rn) are evaluated from the measured radon and decay product concentrations in a 1-m³ chamber as a function of the degree of turbulence. The turbulence is induced by ventilation and/or generating heat. The coefficient of eddy diffusivity, k_e, in the theoretical formula of Crump and Seinfeld for calculating the deposition rate is examined by fitting the Crump and Seinfeld formula to our experimental results. The expression for k_e thus obtained is proportional to λ³_v (ventilation) and W^3/2 (generated heat). The deposition rate constant of ²¹⁸Po is found to be about three times that of ²¹⁴Pb, which means that the associated diameter of the ²¹⁴Pb particle is about twice as large as the diameter of the ²¹⁸Po particle. This difference could be due to the physical and chemical properties of the two elements.

Original language	English
Pages (from-to)	257-265
Number of pages	9
Journal	Aerosol Science and Technology
Volume	14
Issue number	2
DOIs	https://doi.org/10.1080/02786829108959488
State	Published - 1 Jan 1991

ASJC Scopus subject areas

Environmental Chemistry
General Materials Science
Pollution

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10.1080/02786829108959488

Cite this

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title = "Influence of turbulence on the deposition rate constant of the unattached radon decay products",

abstract = "The deposition rate constants of the different unattached decay products of radon (222Rn) are evaluated from the measured radon and decay product concentrations in a 1-m3 chamber as a function of the degree of turbulence. The turbulence is induced by ventilation and/or generating heat. The coefficient of eddy diffusivity, ke, in the theoretical formula of Crump and Seinfeld for calculating the deposition rate is examined by fitting the Crump and Seinfeld formula to our experimental results. The expression for ke thus obtained is proportional to λ3v (ventilation) and W3/2 (generated heat). The deposition rate constant of 218Po is found to be about three times that of 214Pb, which means that the associated diameter of the 214Pb particle is about twice as large as the diameter of the 218Po particle. This difference could be due to the physical and chemical properties of the two elements.",

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T1 - Influence of turbulence on the deposition rate constant of the unattached radon decay products

AU - Vanmarcke, H.

AU - Landsheere, C.

AU - Van Dingenen, Rita

AU - Poffijn, André

PY - 1991/1/1

Y1 - 1991/1/1

N2 - The deposition rate constants of the different unattached decay products of radon (222Rn) are evaluated from the measured radon and decay product concentrations in a 1-m3 chamber as a function of the degree of turbulence. The turbulence is induced by ventilation and/or generating heat. The coefficient of eddy diffusivity, ke, in the theoretical formula of Crump and Seinfeld for calculating the deposition rate is examined by fitting the Crump and Seinfeld formula to our experimental results. The expression for ke thus obtained is proportional to λ3v (ventilation) and W3/2 (generated heat). The deposition rate constant of 218Po is found to be about three times that of 214Pb, which means that the associated diameter of the 214Pb particle is about twice as large as the diameter of the 218Po particle. This difference could be due to the physical and chemical properties of the two elements.

AB - The deposition rate constants of the different unattached decay products of radon (222Rn) are evaluated from the measured radon and decay product concentrations in a 1-m3 chamber as a function of the degree of turbulence. The turbulence is induced by ventilation and/or generating heat. The coefficient of eddy diffusivity, ke, in the theoretical formula of Crump and Seinfeld for calculating the deposition rate is examined by fitting the Crump and Seinfeld formula to our experimental results. The expression for ke thus obtained is proportional to λ3v (ventilation) and W3/2 (generated heat). The deposition rate constant of 218Po is found to be about three times that of 214Pb, which means that the associated diameter of the 214Pb particle is about twice as large as the diameter of the 218Po particle. This difference could be due to the physical and chemical properties of the two elements.

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