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

Ari Auvinen; Kari Lehtinen; Juan Enriques; Jorma Jokiniemi; Riitta Zilliacus

doi:10.1016/S0021-8502(00)00027-6

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

Ari Auvinen, Kari Lehtinen, Juan Enriques, Jorma Jokiniemi^*, Riitta Zilliacus

^*Corresponding author for this work

VTT (former employee or external)

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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 language	English
Pages (from-to)	1029 - 1043
Number of pages	15
Journal	Journal of Aerosol Science
Volume	31
Issue number	9
DOIs	https://doi.org/10.1016/S0021-8502(00)00027-6
Publication status	Published - 2000
MoE publication type	A1 Journal article-refereed

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title = "Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident",

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.",

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T1 - Vaporisation rates of CsOH and CsI in conditions simulating a severe nuclear accident

AU - Auvinen, Ari

AU - Lehtinen, Kari

AU - Enriques, Juan

AU - Jokiniemi, Jorma

AU - Zilliacus, Riitta

PY - 2000

Y1 - 2000

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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DO - 10.1016/S0021-8502(00)00027-6

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EP - 1043

JO - Journal of Aerosol Science

JF - Journal of Aerosol Science

IS - 9

ER -

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

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