Measurements of Gas Diffusion Coefficients at Elevated Temperatures PDF Download
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Author: Cynthia Ann Palmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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Author: Cynthia Ann Palmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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Author: Charles A. Carey
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
Methods of experimentally determining the transport properties of high temperature gases have been developed and measurements of viscosity, thermal conducitvity, and diffusion coefficients obtained. The heat transfer rate through laminar boundary layers, the absorption of sound, and a schlieren method have been investigated for the determination of transport properties. Heat transfer measurements on the side wall of the shock tube have been used to obtain viscosities of argon, oxygen, nitrogen, and carbon dioxide up to 4000 K. The boundary layer equations were solved for side wall boundary layers in the shock tube in oxygen to assess the relative importance of viscosity and thermal conductivity in heat transfer to the side wall. Thermal conductivities were deduced from end wall heat transfer measurements in carbon dioxide up to 2000 K and oxygen up to 4000 K. End wall heat transfer measurements in nitrogen and argon have been compared to theory with excellent agreement. Various methods for measuring ultrasonic absorption are discussed. The viscosity of argon at temperatures up to 8000 K were determined with the ultrasonic method. Diffusion coefficient in 50-50 He-Ar mixtures have also been obtained from the ultrasonic measurements at room temperature with excellent agreement with other investigators. The theory of a schlieren method for the measurement of thermal conductivity using the end wall boundary layer in the shock tube is discussed. (Author).
Author: T. R. Marrero
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
Diffusion coefficients of binary mixtures of dilute gases and comprehensively compiled, critically evaluated, and correlated by new semi-empirical expressions. There are seventy-four systems for which the data are sufficiently extensive, consistent and accurate to allow diffusion coefficients to be recommended with confidence. Deviation plots are given for most of these systems. Almost every gaseous diffusion coefficient which was experimentally determined and reported prior to 1970 can be obtained from the annotated bibliography and table of gas pairs. A detailed analysis of experimental methods is given, and intercomparison of their results helps establish reliability limits for the data, which depend strongly on temperature. Direct measurements are supplemented by calculations based on knowledge of intermolecular forces derived from independent sources-molecular beam scattering for high temperatures, and London dispersion constants for low temperatures. In addition, diffusion coefficients for several mixtures are obtained from experimental data on mixture viscosities and thermal diffusion factors. Combination of all these results gives diffusion coefficients over a very extensive temperature range from very low temperatures to 10,000 K. All data are corrected for composition dependence and for quantum effects. New semi-empirical equations are derived for making such corrections easily. (Author).
Author:
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Category : Aeronautics
Languages : en
Pages : 790
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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: John W. Hastie
Publisher:
ISBN:
Category : Gases at high temperatures
Languages : en
Pages : 936
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Author: Eric Thompson Nelson
Publisher:
ISBN:
Category : Anthracite coal
Languages : en
Pages : 342
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Author: John Crank
Publisher: Oxford University Press
ISBN: 9780198534112
Category : Mathematics
Languages : en
Pages : 428
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Book Description
Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Author: Fabio Sauli
Publisher: Cambridge University Press
ISBN: 1107043018
Category : Science
Languages : en
Pages : 513
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Book Description
Describes the fundamentals and applications of gaseous radiation detection, ideal for researchers and experimentalists in nuclear and particle physics.
Author: Paul D. Freeze
Publisher:
ISBN:
Category : Gases
Languages : en
Pages : 24
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