An Analytical Model for Fission-product Transport and Deposition from Gas Streams PDF Download
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Author: M. Necati Özışık
Publisher:
ISBN:
Category : Fission
Languages : en
Pages : 58
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Book Description
Author: M. Necati Özışık
Publisher:
ISBN:
Category : Fission
Languages : en
Pages : 58
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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An important mechanism in the transport and deposition of very small particles from gas streams to the surfaces of a conduit is diffusion due to the Brownian movement of particles. The heat-mass analogy is used to describe the diffusion, and equations are derived for the deposition of fission products from a gas stream to wall surfaces as a function of the distance along the conduit. Effects of radioactive decay on the validity of the heat-mass analogy in applying standard heat transfer relations to predict material transfer to wall surfaces are discussed. (auth).
Author:
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Category :
Languages : en
Pages :
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Radioactive species that enter the coolant stream of a gas-cooled reactor are carried in the stream and deposited on coolant passages and various system components. Analytical relations are presented for deposition of radioactive particles from isothermal gas streams to the walls of a conduit as a function of time, distance, and variable source release rate. Effect of recirculation of the coolant gas on deposition is also included in the analysis. In the physical model considered, particles are assumed to be transported from the gas stream to the immediate vicinity of the walls of the conduit by diffusion; the resistance to mass transfer by diffusion is obtained by analogy from heat transfer coefficients. At the wall surface an imperfect retention scheme is assumed, that is particles striking the wall surface are not all deposited but some re-enters the gas stream. This imperfect retention scheme is characterized by a wall surface resistance to mass transfer in series with the stream resistance to mass diffusion. To simplify the presentation of the analysis this unknown wall surface resistance has been incorporated into a single factor, P, which enters the equations as a multiplier to the stream mass transfer coefficient. The analysis is correlated with experiments for deposition of fission products from isothermal helium streams on the surface of a stainless steel tube.
Author: James A. Gieseke
Publisher:
ISBN:
Category : Dispersion
Languages : en
Pages : 20
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Author:
Publisher:
ISBN:
Category : Fission products
Languages : en
Pages : 24
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Author: Joe Worthington Durkee
Publisher:
ISBN:
Category : Fission products
Languages : en
Pages : 340
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 926
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1262
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: U.S. Atomic Energy Commission. Division of Technical Information
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 988
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