Flow methods in the gas phase

The primary reaction, whose kinetics were followed in this system, was 

It was found to be first order in both N atom and oxygen molecule, and the second-order rate coefficient of 8.3 x 10 exp(—7100/i 7 ) 1. mole sec was evaluated. 

A flame which is commonly used in the laboratory for kinetic measurements (such as that from a modified Bunsen burner) is essentially a steady-state system with the combustion zone fixed. The processes involved in flames are radical chain reactions in which the three normal stages (initiation, propagation and termination) 

Normally the measured quantities will he the weight fractions of (/i— 1) species, the flame velocity (for a one-dimensional flat flame this is the velocity component of the cold gas normal to the front), the temperature profile of the flame and the distance, although in certain cases other parameters may be substituted These are the quantities whose measurement is difficult and produced the problems which 

A very schematic representation of a system for following kinetics in flames is shown in Fig. 22. The arrangement used in a given case will depend to a large extent on the nature of the reaction. The type of equipment available has been discussed very thoroughly by Fristrom and Westenberg it will be considered here briefly under four headings. 

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