A Shock Tube Measurement of the Recombination Rate of Oxygen PDF Download
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Author: Eugene Joseph Kilroy
Publisher:
ISBN:
Category : Oxygen
Languages : en
Pages : 130
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Author: Eugene Joseph Kilroy
Publisher:
ISBN:
Category : Oxygen
Languages : en
Pages : 130
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Author: Jack Wilson
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 160
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Book Description
The recombination rate of oxygen was measured in a shock tube. The shock tube is unconventional in that airfoils have been inserted to expand the flow, and a constant-area channel placed behind the airfoils; thus the shock tube is effectively a low-expansion-ratio shock tunnel. The gas in the tube is first dissociated and set in motion by the shock wave, then flows through the expansion waves created by the airfoils, and is cooled, and finally enters the constant-area channel, where it recombines. Measurement of the degree of dissociation along the constant area channel enables one to calculate the recombination rate of the oxygen atoms. The measured recombination rate constants are compared with those obtained by reflecting the known dissociation-rate constants through the equilibrium constant. (Author).
Author: R. I. Soloukhin
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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The recombination rate of oxygen atoms was measured directly in thermally pre-dissociated pure oxygen in a shock tube at a temperature above 3000K. A discrepancy of two to three orders of magnitude between various earlier, indirectly obtained experimental data prompted the author to attempt a direct measurement of the recombination rate, in view of its importance in the analysis of the combustion process and in high-temperature gas dynamics. (Author).
Author: J. WILSON
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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The recombination rate of oxygen has been measured in a shock tube. The gas in the tube is first dissociated and set in motion by the shock wave, then flows through the expansion waves created by the airfoils and is cooled, and finally flows into the constant-area channel, where it recombines. Shock waves between M = 7.5 and M = 9.5 in mixtures of oxygen and argon at 2 cm. Hg. pressure are used, giving degrees of dissociation between 0.1 and 0.4. The temperature drop across the expansion is about 700 K. Measurement of the degree of dissociation downstream of the expansion leads to the recombination rate. The means of measurement is absorption of ultra-violet light at a wavelength of 2283 angstroms. (Author).
Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: T. A. JACOBS
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ISBN:
Category :
Languages : en
Pages : 1
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By an extension of the ideas embodied in the single-pulse shock tube, a technique was developed which allows the direct measurement of recombination rates of many atomic species at high temperature. In the present technique, the expansion chamber is located a few tube diameters from the shock tube end plate rather than at the high-pressure end as in the conventional singlepulse shock tube. A cylindrical diaphragm, lying flush with the inside diameter of the tube, is used to control the time of initiation of an expansion wave. Experimental observation has shown that the present technique increases the gas expansion rate by an order of magnitude. The one-dimensionality of the flow at the shock tube end wall was also investigated. The technique developed in conjunction with the spectroscopic means of observation was employed to gain preliminary measurements of the recombination rate of atomic chlorine. (Author).
Author: Stephan Asher Fogelson
Publisher:
ISBN:
Category : Ionized air
Languages : en
Pages : 536
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Author: Anthony M. Dean
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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For some time now this laboratory has been utilizing nitrous oxide as a high temperature source of oxygen atoms. Recently, an independent technique has been used to calibrate the detector system for oxygen atoms. With this calibration factor known, more refined experiments have been performed in which the absolute oxygen atom concentration can be monitored as a function of time. It was found that only slight modifications of earlier rate constant assignments were required to quantitatively explain these new results. In this light it is now felt that the dissociation kinetics of N2O are reasonably well understood. Thus the CO2 production rate in N2O/CO mixtures has been measured in an attempt to determine k sub r. It is shown that small amount of impurities can drastically affect the CO2 production rate. Analysis of this impurity effect has yielded estimates of the actual recombination rate constant between 2100 and 3200 K. The value of k sub r determined in this way is shown to be consistent with the recent measurements of k sub d reported by Wagner, and Kiefer, which yielded normal activation energies for CO2 dissociation.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 828
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1170
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