Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident

Ari Auvinen, Kari Lehtinen, Juan Enriques, Jorma Jokiniemi (Corresponding Author), Riitta Zilliacus

    Research output: Contribution to journalArticleScientificpeer-review

    30 Citations (Scopus)

    Abstract

    The vaporisation rates of volatile fission product compounds are critical parameters for modelling aerosol formation following a severe nuclear accident. The vaporisation of CsOH and CsI was studied in a pure steam atmosphere at ambient pressure (85-89 kPa) by increasing the temperature of the flow furnace up to 1000°C. For this purpose, samples were doped with a small amount of radioactive tracer. The vaporisation rate was then determined from the decrease in sample activity with time, using a germanium gamma detector placed outside the furnace. Calculated vaporisation rates obtained by solving complete velocity, temperature and vapour concentration profiles surrounding the sample with FLUENT CFD-software, were in reasonable agreement with the data. A simple engineering calculation agrees almost perfectly with the FLUENT results, if a constant value, Sh≈8, for the Sherwood number is used.
    Original languageEnglish
    Pages (from-to)1029 - 1043
    Number of pages15
    JournalJournal of Aerosol Science
    Volume31
    Issue number9
    DOIs
    Publication statusPublished - 2000
    MoE publication typeA1 Journal article-refereed

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