The molecular and reactive thermal conductivities and accommodation coefficients of dissociating hydrogen up to 2400K

Abstract

The effective thermal conductivity of dissociating hydrogen is measured by the column method in the interval 1200-2400K in three tubes of different geometry at nine pressures ranging from 26 to 552 torr. Data processing by means of a simple formula and the least-squares technique allows four quantities to be obtained; (i) the molecular thermal conductivity, (ii) the reactive thermal conductivity due to dissociation, (iii) the molecular accommodation coefficient of hydrogen on tungsten and (iv) the reactive accommodation coefficient (catalytic efficiency of tungsten for dissociation of hydrogen). The mean value of the atom-molecule collision cross-section in the range 1800-2400K is calculated from the experimental data and found to be 8.25*10^-16 cm².