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Riitta Zilliacus - One of the best experts on this subject based on the ideXlab platform.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Kari Lehtinen, Juan Enriquez, Jorma Jokiniemi, Riitta Zilliacus
    Abstract:

    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.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident current topics in nuclear aerosols
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Juan Enriquez, Jorma Jokiniemi, Kari E J Lehtinen, Riitta Zilliacus
    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 Csl 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.

Ari Auvinen - One of the best experts on this subject based on the ideXlab platform.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Kari Lehtinen, Juan Enriquez, Jorma Jokiniemi, Riitta Zilliacus
    Abstract:

    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.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident current topics in nuclear aerosols
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Juan Enriquez, Jorma Jokiniemi, Kari E J Lehtinen, Riitta Zilliacus
    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 Csl 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.

Jorma Jokiniemi - One of the best experts on this subject based on the ideXlab platform.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Kari Lehtinen, Juan Enriquez, Jorma Jokiniemi, Riitta Zilliacus
    Abstract:

    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.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident current topics in nuclear aerosols
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Juan Enriquez, Jorma Jokiniemi, Kari E J Lehtinen, Riitta Zilliacus
    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 Csl 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.

Juan Enriquez - One of the best experts on this subject based on the ideXlab platform.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Kari Lehtinen, Juan Enriquez, Jorma Jokiniemi, Riitta Zilliacus
    Abstract:

    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.

  • vaporisation rates of csoh and csi in conditions simulating a severe nuclear accident current topics in nuclear aerosols
    Journal of Aerosol Science, 2000
    Co-Authors: Ari Auvinen, Juan Enriquez, Jorma Jokiniemi, Kari E J Lehtinen, Riitta Zilliacus
    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 Csl 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.

Qinggang Qiu - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on the heat and mass transfer characteristics of air water two phase flow in an evaporative condenser with a horizontal elliptical tube bundle
    Applied Thermal Engineering, 2020
    Co-Authors: Xiaojing Zhu, Xu Shi, Shi Chen, Shengqiang Shen, Qinggang Qiu
    Abstract:

    Abstract In this paper, the heat and mass transfer performance of an evaporative condenser with a horizontal elliptical tube bundlewasexperimentally studied. The effects of important parameters, such as the spray density, frontal air velocity, ambient temperature and humidity, on the heat and mass transfer performance were discussed in detail. Among all parameters studied, it was found that the wet bulb temperature has greater effects on the heat transfer performance than the relative humidity. Thedifference between the steamtemperature and tube wall temperature, the inlet steam flow rate and the steam saturation temperature all affect the mean within-tube condensation heat transfer coefficient. Themeanwithin-tube condensation heat transfer coefficientincreases greatly when the latter two increase, while the increase in the difference between steam and tube wall temperature hinders the mean within-tube condensation heat transfer coefficient. The empirical correlations of the mean within-tube condensation heat transfer coefficient, wall-film convective heat transfer coefficient and the film-air convective mass transfer coefficient were finally obtained by regression fitting the experimental data using the least square method and all empirical correlations have enough precision in Engineering Calculation.