Bernard Lewis's Combustion, Flames and Explosions of Gases PDF

By Bernard Lewis

ISBN-10: 1483231550

ISBN-13: 9781483231556

Combustion, Flames and Explosions of Gases, 3rd variation offers the chemist, physicist, and engineer with the clinical foundation for figuring out combustion phenomena.

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Extra resources for Combustion, Flames and Explosions of Gases

Example text

10) 1. 116. 27. 37. 0 mm. Hg per minute, respectively. 35, a value exceeding the square of the ratio of the pressures. 867)/r -a' . U1; m 0 is the rate of formation of chain carriers per unit area. The rate 7 of chain carrier formation per unit volume is represented by the numerator of equation (11). The factor λ in this expression decreases with increasing pressure; furthermore, it is difficult to imagine that m0 can increase with more than the first power of the partial pressure of one of the reactants such as hydrogen.

The following procedure is used to calculate relative 10 S. N. Foner and R. L. Hudson, / . Chem. Phys. 23,1364 (1955). C. H. Gibson and C. N. Hinshelwood, Proc. Roy. Soc. (London) A119, 591 (1928). * The porcelain vessel behaved much like a KCl-coated vessel (see von Elbe and Lewis1). 11 36 II. THE REACTION BETWEEN HYDROGEN AND OXYGEN reaction rates in Table 1: to express equation (10) as a function of mixture composition the term /c6[M] must be replaced by fc6,H2[H2] + &6,o2 [O2] ; K12 becomes 4π2Ζ)/ί22; D is λ Θ ΐ%ο 2 /3; and the dependence of the effective mean free path Xe on mixture composition may be expressed by [see equations (13) and (15), Chapter I] 1/Xe = (2/33)7Γ[Η2]σ2,θ2,Η(1 + 33/2) 1 ' 2 + π[0 2 Κ° 2 ·° 2 (1 + 33/32) 1 / 2 (17) which may be written l/λ.

For the gas-phase reaction between H 0 2 and H 2 two alternatives sug­ gest themselves. One is reaction (XI) and the other is H 0 2 -f H 2 = H 2 0 + OH. The former reaction is endothermic and the latter is strongly exothermic, but this furnishes no basis for estimating the relative prob­ abilities of the two reactions since the rate coefficients depend on the unknown activation energies and steric factors. Evidence in favor of reaction (XI) is furnished by the fact that considerable amounts of hy­ drogen peroxide are formed in mixtures of hydrogen and oxygen at tem­ peratures and pressures between the second and third explosion limits.

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Combustion, Flames and Explosions of Gases by Bernard Lewis


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