Oxygen mole fraction

A closer analysis of die equilibrium products of the 1 1 mixture of methane and steam shows the presence of hydrocarbons as minor constituents. Experimental results for die coupling reaction show that the yield of hydrocarbons is dependent on the redox properties of the oxide catalyst, and the oxygen potential of the gas phase, as well as die temperamre and total pressure. In any substantial oxygen mole fraction in the gas, the predominant reaction is the formation of CO and the coupling reaction is a minor one. 

For the dilute reactive constituent R which forms the oxide RO , let the thickness of the internal oxidation zone be then for the inward diffusion of oxygen, mole fraction No... 

Transient computations of methane, ethane, and propane gas-jet diffusion flames in Ig and Oy have been performed using the numerical code developed by Katta [30,46], with a detailed reaction mechanism [47,48] (33 species and 112 elementary steps) for these fuels and a simple radiation heat-loss model [49], for the high fuel-flow condition. The results for methane and ethane can be obtained from earlier studies [44,45]. For propane. Figure 8.1.5 shows the calculated flame structure in Ig and Og. The variables on the right half include, velocity vectors (v), isotherms (T), total heat-release rate ( j), and the local equivalence ratio (( locai) while on the left half the total molar flux vectors of atomic hydrogen (M ), oxygen mole fraction oxygen consumption rate... 

Because the vessel is pressurized with pure nitrogen, the number of moles of oxygen remains constant during pressurization, whereas the mole fraction decreases. During depressurization, the composition of the gas within the vessel remains constant, but the total number of moles is reduced. Thus the oxygen mole fraction remains unchanged. 

The purging cycles for a pressure-first purge are shown in Figure 7-3. In this case the beginning of the cycle is defined as the end of the initial pressurization. If the initial oxygen mole fraction is 0.21, the oxygen mole fraction at the end of this initial pressurization is given by... 

Equation (9.73) can be used to explain the burning behavior with respect to the roles of flame radiation and convection. It can also explain the effects of oxygen and the addition of external radiant heat flux. These effects are vividly shown by the correlation offered from data of Tew arson and Pion [18] of irradiated horizontal small square sheets of burning PMMA in flows of varying oxygen mole fractions. The set of results for steady burning are described by a linear correlation in q" and Xq2 for L= 1.62 kJ/g in Figure 9.16. This follows from Equation (9.73) ... 

Fig. 3 Influence of P2 on oxygen mole fractions in the third stage, Nf=50mol/s (range of P2 = 0.1 to 1.0 106 Pa).

Figure 15. Simulation results showing membrane dehydration (a) and cathode flooding (b). (a) 1 as a function of membrane position (cathode on the left) for different current densities. (Reproduced with permission from ref 14. Copyright 1991 The Electrochemical Society, Inc.) (b) Dimensionless oxygen mole fraction as a function of cathode-diffusion-medium position and cathode overpotential. (Reproduced with permission from ref 120. Copyright 2000 The Electrochemical Society, Inc.)...

Fig. 1. 18. Effective temperature rise during oxidative coke removal as a function of the oxygen mole fraction of the regeneration feed gas.

Fig. 15. Variation of critical withdrawal rate with oxygen mole fraction and vessel diameter. Fresh boric acid coated vessels at 500 °C (after Baldwin et al. [21]). x = 0.28 X, 51 mm diam o, 36 mm A, 24 mm v, 15 mm. (By courtesy of The Faraday Society.)...

The reaction in aged boric acid vessels shows no significant effect of vessel diameter, either on the maximum rate or the induction period, over the range 15, 24, 36 and 51 mm. For a constant total pressure of 500 torr. Fig. 19 shows the variation of the maximum rate R with (a) oxygen mole fraction y over the range 0.07—0.72, the H2 mole fraction x being... 

Tj with oxygen mole fraction x, cannot be satisfactorily described using the simple extension of the IBI formulation outlined here. This difBculty seems more likely to be related to the adequacy of the description of the fluid mixture than to a breakdown of the basic IBI hypotheses which appear to be well justified in the above case. 

N2, He, etc.) are generally used. According to Faraday s law, the oxygen mole fraction... 

The most important variable, after the physical configuration, is the oxidizer composition. The oxygen mole fraction in the oxidizer, Q, has a very large influence on heat transfer intensity. Almost all of the previous studies used either air (Q = 0.21) or pure oxygen (Q = 1.0) as the oxidizer. This affects both the flame temperature and the amount of dissociation in the combustion products. As an example, the adiabatic flame temperature... 

Tempetaniie CC) 2DOOOO Temperaiiire PC) 17.S527 529557 Flue Gas Oxygen Mole Fraction 1 01701... 

Mass Flow Rate Dry Basis (kgih) 15GD.DQQQ 1556.4400 Flue Gas Oxygen Mole Fraction 0.17K... 

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