Sodium mist behavior in cover gas space of LMFBR. Out-pile experiment.

HIMENO Yoshiaki, TAKAHASHI June

doi:10.3327/jnst.17.404

Sodium mist behavior in argon cover gas space over sodium pool was investigated ex-perimentally using of a test vessel having cover gas volume of 100l. Mass concentration and gravitational settling flux of the mist (i.e. sodium aerosol) were determined between pool temperature range of 290520°C. Apparatuses used for the concentration determination were a He-Ne laser mist concentration meter (LCM) and mist traps, which were developed specifically for the present experiment. The mist gravitational settling flux φ was determined by using of collection plates, which were exposed to the mist entrained cover gas over sodium pool.<BR>The experimental results revealed that the concentration C was very high from 0.15 to 20 g/m³. It increased with pool temperature. The mist particle radii, which were determined from the gravitational settling flux ψ and decay curve of the concentration, were from 1.5 to 13 μm in the range of the present experiment. The vapor evaporation rate φ_e from the pool surface, which were also determined from the experimental ψ data, were found to increase with saturated vapor pressure P_s at pool surface. This rate did not depend so strongly on experimental geometries and cover gas flow convection pattern over sodium pool. Evaluations of transient C changing and steady state C fluctuation indicated that the mist formation was occurred near the pool surface.

Sodium mist behavior in cover gas space of LMFBR. Out-pile experiment.

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