The Determination of Diffusion Coefficient of a Gas-metal System PDF Download
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Author: V.L. Gelezunas
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 20
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Author: V.L. Gelezunas
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 20
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Author: Roger A. Strehlow
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 262
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Book Description
The transport property which is most fundamentally related to forces between unlike molecules is the ordinary diffusion due to concentration gradients. Unfortunately, this property and its dependence upon temperature have not been systematically studied experimentally, with the result that the literature does not contain the data necessary to obtain good force constants for the introduction of unlike molecuels. The present work describes an experimental method for determining diffusion coefficients, based on the variation of thermal conductivity with composition in binary mixtures which is capable of being used over a wide range of temperature. Experimental results for the systems n-butane-hydrogen, sulfur hexafluoride-hydrogen, argon-hydrogen, and argon-helium are given for a temperature range from 10°C. to 140°C.
Author: Frank E. Jaumot
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 320
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Author: R. O. Hutchinson
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 40
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Author: Ronald C. Chisholm
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Author: Andreas Öchsner
Publisher: Trans Tech Publications Ltd
ISBN: 3038132039
Category : Technology & Engineering
Languages : en
Pages : 860
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Book Description
This special issue contains selected peer-reviewed papers which were presented at the Third International Conference on Diffusion in Solids and Liquids (DSL-2007), held at the Hotel Pestana Alvor Praia, Algarve, Portugal during the 4th-6th July, 2007.
Author: Robert Edwin Bunde
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 326
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Author: Vladislav Boronenkov
Publisher: Springer Science & Business Media
ISBN: 364222377X
Category : Science
Languages : en
Pages : 415
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This monograph describes mathematical models that enable prediction of phase compositions for various technological processes, as developed on the base of a complex physico-chemical analysis of reaction. It studies thermodynamics and kinetics of specific stages of complex pyrometallurgical processes involving boron, carbon, sulfur, tungsten, phosphorus, and many more, as well as their exposure to all sorts of factors. First and foremost, this enables to optimize processes and technologies at the stage of design, while traditional empirical means of development of new technologies are basically incapable of providing an optimal solution. Simulation results of metals and alloys production, welding and coating technologies allow obtaining materials with pre-given composition, structure and properties in a cost-saving and conscious manner. Moreover, a so-called "inverse problem", i.e., selecting source materials which would ensure the required results, cannot be solved by any other means.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Major results of tritium and rare gas diffusion research conducted under the contract are summarized. The materials studied were austenitic stainless steels, Zircaloy, and niobium. In all three of the metal systems investigated, tritium release rates were found to be inhibited by surface oxide films. The effective diffusion coefficients that control tritium release from surface films on Zircaloy and niobium were determined to be eight to ten orders of magnitude lower than the bulk diffusion coefficients. A rapid component of diffusion due to grain boundaries was identified in stainless steels. The grain boundary diffusion coefficient was determined to be about six orders of magnitude greater than the bulk diffusion coefficient for tritium in stainless steel. In Zircaloy clad fuel pins, the permeation rate of tritium through the cladding is rate-limited by the extremely slow diffusion rate in the surface films. Tritium diffusion rates through surface oxide films on niobium appear to be controlled by cracks in the surface films at temperatures up to 600°C. Beyond 600°C, the cracks appear to heal, thereby increasing the activation energy for diffusion through the oxide film. The steady-state diffusion of tritium in a fusion reactor blanket has been evaluated in order to calculate the equilibrium tritium transport rate, approximate time to equilibrium, and tritium inventory in various regions of the reactor blanket as a function of selected blanket parameters. Values for these quantities have been tabulated.
Author: Cynthia Ann Palmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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