A tunable IR-diode laser technique for measuring reaction rates of high-temperature aerosols

✍ Scribed by O. Brandt; P. Roth

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 605 KB
• Volume: 77
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(89)90105-3

✦ Synopsis

To determine reaction rates in high-temperature aerosols, the time-dependent mass change of the suspended particles, or changes of the gaseous reactants or products, must be measured. In the present case, the shock tube technique has been applied to produce the high-temperature reactions and a rapid" scanning infrared diode laser has been used to measure the gaseous reaction products from heterogeneous gas-particle reactions. The method has been applied to soot-oxygen-argon mixtures where CO and CO~ are the expected gaseous reaction products. The particle properties were determined from in situ extinction measurements at three different wavelengths, while the total particle mass suspended in the carrier gas was determined by weighing the mass of the particles in a known volume. Theoretical considerations on heterogeneous reactions and the optical diagnostic methods are given, together with preliminary results.