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Condensation processes in turbulent non-isothermal free steam jet in air.

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Title: Condensation processes in turbulent non-isothermal free steam jet in air.
Authors: Burluka, Alexey A.1 (AUTHOR) alexey.burluka@northumbria.ac.uk
Source: International Journal of Heat & Mass Transfer. Nov2024, Vol. 233, pN.PAG-N.PAG. 1p.
Subjects: Particle dynamics analysis, Turbulent jets (Fluid dynamics), Probability density function, Water jets, Two-phase flow
Abstract: A method based on introduction of a presumed joint probability density function of the vapour mass fraction and enthalpy of the two-phase mixture is proposed for finding the average rate of condensation, including nucleation and vapour deposition on the liquid surface. The presumed joint pdf carrier consists of two branches: one for pure mixing and the other for the saturated vapour. The method is illustrated with numerical simulations of condensation in a free turbulent jet of saturated steam issuing into cold air and assessed against the experimental data collected for such a jet using a Phase Doppler Anemometry system. It is shown that relatively large size of drops observed in condensing water vapour jets may be explained by simultaneous action of homogeneous condensation and droplet collisions while inhomogeneous condensation does not seem to play any significant role. • Model is proposed for average rate of condensation in a turbulent non-isothermal flow. • This model is based on presumed joint pdf for enthalpy and vapour mass fraction. • Model assessment is supported with measurements in a condensing turbulent steam jet. • Taking into account Tolman length is important for calculation of nucleation rate. • Most of the liquid phase is formed through homogeneous condensation under studied conditions. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 179172573
AccessLevel: 6
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PubTypeId: academicJournal
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  Data: Condensation processes in turbulent non-isothermal free steam jet in air.
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  Data: <searchLink fieldCode="AR" term="%22Burluka%2C+Alexey+A%2E%22">Burluka, Alexey A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> alexey.burluka@northumbria.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Heat+%26+Mass+Transfer%22">International Journal of Heat & Mass Transfer</searchLink>. Nov2024, Vol. 233, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Particle+dynamics+analysis%22">Particle dynamics analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulent+jets+%28Fluid+dynamics%29%22">Turbulent jets (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Probability+density+function%22">Probability density function</searchLink><br /><searchLink fieldCode="DE" term="%22Water+jets%22">Water jets</searchLink><br /><searchLink fieldCode="DE" term="%22Two-phase+flow%22">Two-phase flow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A method based on introduction of a presumed joint probability density function of the vapour mass fraction and enthalpy of the two-phase mixture is proposed for finding the average rate of condensation, including nucleation and vapour deposition on the liquid surface. The presumed joint pdf carrier consists of two branches: one for pure mixing and the other for the saturated vapour. The method is illustrated with numerical simulations of condensation in a free turbulent jet of saturated steam issuing into cold air and assessed against the experimental data collected for such a jet using a Phase Doppler Anemometry system. It is shown that relatively large size of drops observed in condensing water vapour jets may be explained by simultaneous action of homogeneous condensation and droplet collisions while inhomogeneous condensation does not seem to play any significant role. • Model is proposed for average rate of condensation in a turbulent non-isothermal flow. • This model is based on presumed joint pdf for enthalpy and vapour mass fraction. • Model assessment is supported with measurements in a condensing turbulent steam jet. • Taking into account Tolman length is important for calculation of nucleation rate. • Most of the liquid phase is formed through homogeneous condensation under studied conditions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijheatmasstransfer.2024.126033
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Particle dynamics analysis
        Type: general
      – SubjectFull: Turbulent jets (Fluid dynamics)
        Type: general
      – SubjectFull: Probability density function
        Type: general
      – SubjectFull: Water jets
        Type: general
      – SubjectFull: Two-phase flow
        Type: general
    Titles:
      – TitleFull: Condensation processes in turbulent non-isothermal free steam jet in air.
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            NameFull: Burluka, Alexey A.
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            – D: 15
              M: 11
              Text: Nov2024
              Type: published
              Y: 2024
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              Value: 00179310
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              Value: 233
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            – TitleFull: International Journal of Heat & Mass Transfer
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