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Asymptotic analysis of fluid thermodynamic behaviors in the near-critical region under highly variable physical properties.

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Title: Asymptotic analysis of fluid thermodynamic behaviors in the near-critical region under highly variable physical properties.
Authors: Zhang, Rui1,2 (AUTHOR), Chen, Lin1,2,3 (AUTHOR) chenlin2018@iet.cn
Source: Heat Transfer Engineering. 2025, Vol. 46 Issue 13/14, p1276-1285. 10p.
Subjects: Compressibility (Fluids), Asymptotic analysis, Thermal diffusivity, Mass transfer, Thermophysical properties
Abstract: Asymptotic analysis based on the fluids governing equations with the exponential model of thermophysical properties is introduced to quantify the influence of each property on the heat and mass transfer behavior of the near-critical fluid. The one-dimensional asymptotic model finds the different behavior in boundary layers and bulk regions controlled by the diffusion and wave mode, respectively. From the asymptotic model, three characteristic parameters are found: nondimensional wave velocity for wave mode, nondimensional diffusion coefficient for diffusion mode, and nondimensional mass transport coefficient for the coupling in between. Larger thermal conductivity, fluid compressibility, and lower specific heat are found to enhance the thermal wave. However, the efficiency of heat transfer by thermal waves is irrelevant to the thermal diffusivity but related to the fluid compressibility. From the calculation of the asymptotic model for supercritical carbon dioxide (sCO2), such efficiency is 0.150, which indicates that most of the thermal energy is accumulated in the boundary layers. [ABSTRACT FROM AUTHOR]
Copyright of Heat Transfer Engineering is the property of Taylor & Francis Ltd 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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  Data: Asymptotic analysis of fluid thermodynamic behaviors in the near-critical region under highly variable physical properties.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Rui%22">Zhang, Rui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Lin%22">Chen, Lin</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> chenlin2018@iet.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Heat+Transfer+Engineering%22">Heat Transfer Engineering</searchLink>. 2025, Vol. 46 Issue 13/14, p1276-1285. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Compressibility+%28Fluids%29%22">Compressibility (Fluids)</searchLink><br /><searchLink fieldCode="DE" term="%22Asymptotic+analysis%22">Asymptotic analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+diffusivity%22">Thermal diffusivity</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Thermophysical+properties%22">Thermophysical properties</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Asymptotic analysis based on the fluids governing equations with the exponential model of thermophysical properties is introduced to quantify the influence of each property on the heat and mass transfer behavior of the near-critical fluid. The one-dimensional asymptotic model finds the different behavior in boundary layers and bulk regions controlled by the diffusion and wave mode, respectively. From the asymptotic model, three characteristic parameters are found: nondimensional wave velocity for wave mode, nondimensional diffusion coefficient for diffusion mode, and nondimensional mass transport coefficient for the coupling in between. Larger thermal conductivity, fluid compressibility, and lower specific heat are found to enhance the thermal wave. However, the efficiency of heat transfer by thermal waves is irrelevant to the thermal diffusivity but related to the fluid compressibility. From the calculation of the asymptotic model for supercritical carbon dioxide (sCO2), such efficiency is 0.150, which indicates that most of the thermal energy is accumulated in the boundary layers. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Heat Transfer Engineering is the property of Taylor & Francis Ltd 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:
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      – Type: doi
        Value: 10.1080/01457632.2024.2368431
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 1276
    Subjects:
      – SubjectFull: Compressibility (Fluids)
        Type: general
      – SubjectFull: Asymptotic analysis
        Type: general
      – SubjectFull: Thermal diffusivity
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Thermophysical properties
        Type: general
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      – TitleFull: Asymptotic analysis of fluid thermodynamic behaviors in the near-critical region under highly variable physical properties.
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            NameFull: Zhang, Rui
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            NameFull: Chen, Lin
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            – D: 01
              M: 08
              Text: 2025
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              Y: 2025
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              Value: 46
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              Value: 13/14
          Titles:
            – TitleFull: Heat Transfer Engineering
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