Determination of the time-resolved probabilities of heterogeneous recombination of atoms in shock tube experiments

Recombination of atomic oxygen on α-Al2O3 at high temperature under air microwave-induced plasma

“…Table 1 presents the values of recombination coefficient c that can be found with the type of alumina (often, it was oxidized aluminum) and the total pressure during the experiment for several authors [4][5][6][7][8][9][10]. These data were mainly obtained in the 60-70s [4][5][6][7] and Berkut [8] twenty years later due to aerothermochemistry problems encountered during atmospheric re-entry of space vehicles. Some recent data [9,10] were published but also around ambient temperature.…”

“…with D O,air the binary diffusion coefficient of O in air, V the mean square atomic oxygen velocity and L the thickness of Table 1 Literature data for the recombination coefficient c of atomic oxygen on alumina at 300 K (700 K when marked) according to several authors [4][5][6][7][8][9][10] Author the recombination boundary layer determined experimentally. Due to the temperature gradient between the sample (T s ) and the plasma bulk (T L ), the relative atomic oxygen concentration ratio is related to the measured intensities ratio I O /I Ar , respectively, at the entrance of the reactor (x = L) and at the surface sample (x = 0).…”

Chapter 5: Physicochemical Models of Hypersonic Flows

“…59-61, and in a shock tube in Refs. [62][63][64][65]. These experiments covered the range of wall temperatures up to 1000 K and stagnation pressures of >10 −2 atm.…”