The effect of pressure on ionization in detonation waves of gaseous explosives

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Title The effect of pressure on ionization in detonation waves of gaseous explosives
Publication Type thesis
School or College Materials Science and Engineering
Department Metallurgy
Author Bracke, Petrus Paul
Date 1960
Description Electrical conduction measurements in detonation waves of gaseous explosives. I were made in a 4.64.inch O.D.I, 1 'inch LD. steel shot tube. Measurements were carried out with the gas mixtures 2H2-0?-+<>.1%N2, lHa-02-N2􁪽 and 2CO-02· Using a d04bie probe techniq4e the effect of pressure on the ion density was stu4ied up to 5,000 psi (340 atm) final pressure. By comparing the measured values of e1eotron:density with the theoreti.ca1 resu1 is based on Saha's equation, sudden shift exceeding the theoretical. value appears at 20 and 50 atm final pressure, respecttve1y, for the 2H2 -02+O.􁪽ioN2 and 2H2 - .02 􁪽 N2 􁪽C)lS mlxtures. This deviation Lncrease s until at 5,000 psi final pressure where the experiQ1enta􁪽 electron density is 10 times larger than the theoretical va1􁪽e. This sudden shift was ,absent in the 2CO·-.02 system, although a smaller deviation also was observed. Calibration of the double probe technique was studied by means of conducting copper salt solutions. However, the .exact calibration factor was determine.d.by assuming agreement t between theory and experiment s .a t low pressures, which .ha s been condemned by sever a I Lnve.st Legatos . Two explanations for the excess ionization encountered with increased: pressure have been advanced. The first attribute􁪽 the effect to increased prominence of H30+ formation as pressure is increased. The second exp1anat:J.on 􁪽 can/be formulated on the basis of the quasi-lattice structure of the plasma advanced by Cook and McEwan. Finally, based on Cook and McEwan's quasi-lattice model, a .semi-empirical formula 'Was worked out for the cohesive energy of the plasma as a function of temperature and pressure. The ionization potential appearing in Saha's equation was corrected by the effect of the plasma C9hesive energy, and a modified Saha's equation was derived.
Type Text
Publisher University of Utah
Language eng
Rights Management (c) Petrus Paul Bracke
Format application/pdf
Format Medium application/pdf
ARK ark:/87278/s6909c9g
Setname ir_etd
ID 2375659
Reference URL https://collections.lib.utah.edu/ark:/87278/s6909c9g
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