Abstract
To improve the performance of the roof slab for LMFBRs, information on the mass concentration and particle size distribution in the gas space enclosed by the reactor vessel is important, however experimental data are very limited(1)(2). Himeno(1) measured the mass concentration and particle size in the gas phase using small sodium pots. Schi_itz et al.(2) also tried to determine the mass concentration and the particle size distribution at high temperatures. However, mist behavior in the cover gas is very complicated and those values in the actual FBR cover gas have not been completely clarified. A few efforts have been devoted to solving the equations that govern particle size distribution of the mist. Himeno(1) and Kudo(3) obtained a solution by representing the mist size with its geometric diameter. However, in this method, the governing equations become very complicated and a large numerical error may be induced because the addition/subtraction law does not hold for the change in the geometric diameter due to each coagulation.
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