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

26 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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nuclear accident
vaporization
Vaporization
Accidents
Furnaces
Radioactive Tracers
Germanium
Radioactive tracers
germanium
aerosol formation
Fission products
Steam
Aerosols
Computational fluid dynamics
temperature
Vapors
Detectors
software
engineering
Temperature

Cite this

Auvinen, A., Lehtinen, K., Enriques, J., Jokiniemi, J., & Zilliacus, R. (2000). Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident. Journal of Aerosol Science, 31(9), 1029 - 1043. https://doi.org/10.1016/S0021-8502(00)00027-6
Auvinen, Ari ; Lehtinen, Kari ; Enriques, Juan ; Jokiniemi, Jorma ; Zilliacus, Riitta. / Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident. In: Journal of Aerosol Science. 2000 ; Vol. 31, No. 9. pp. 1029 - 1043.
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Auvinen, A, Lehtinen, K, Enriques, J, Jokiniemi, J & Zilliacus, R 2000, 'Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident', Journal of Aerosol Science, vol. 31, no. 9, pp. 1029 - 1043. https://doi.org/10.1016/S0021-8502(00)00027-6

Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident. / Auvinen, Ari; Lehtinen, Kari; Enriques, Juan; Jokiniemi, Jorma (Corresponding Author); Zilliacus, Riitta.

In: Journal of Aerosol Science, Vol. 31, No. 9, 2000, p. 1029 - 1043.

Research output: Contribution to journalArticleScientificpeer-review

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N2 - 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.

AB - 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.

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