抄録
In connection with the analyses of hypothetical massive air ingress accidents in High Temperature Gas-cooled Reactors (HTGRs), an experimental study on mass transfer with homogeneous and heterogeneous chemical reactions and in-pore diffusion was performed in gas mixture crossflow past a porous circular cylinder placed in a high temperature environment. The Reynolds numbers ranged from 533-2 490, and the temperatures of the cylinder from 848-1 120°C. The porous graphite cylinder was corroded in a nitrogen gas flow containing approximately 5 % oxygen. Mean and local mass transfer coefficients and corrosion rates were obtained to examine the influences of chemical reactions and in-pore diffusion on mass transfer. It is concluded that the chemical reactions do not influence significantly the mass transfer under conditions expected in HTGR air ingress accidents, and that the effect of the in-pore diffusion on the mass transfer can be estimated by the empirical relations of the corrosion rate and mass transfer.
