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Friction and heat transfer in forced air convection with variable physical properties.

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Title: Friction and heat transfer in forced air convection with variable physical properties.
Authors: Modesti, Davide1 (AUTHOR) davide.modesti@gssi.it, Pirozzoli, Sergio2 (AUTHOR)
Source: Journal of Fluid Mechanics. 1/25/2025, Vol. 1003, p1-18. 18p.
Subjects: Turbulent boundary layer, Heat transfer coefficient, Properties of fluids, Transport theory, Reynolds number
Abstract: We establish a theoretical framework for predicting friction and heat transfer coefficients in variable-property forced air convection. Drawing from concepts in high-speed wall turbulence, which also involves significant temperature, viscosity and density variations, we utilize the mean momentum balance and mean thermal balance equations to develop integral transformations that account for the impact of variable fluid properties. These transformations are then applied inversely to predict the friction and heat transfer coefficients, leveraging the universality of passive scalars transport theory. Our proposed approach is validated using a comprehensive dataset from direct numerical simulations (DNS), covering both heating and cooling conditions up to a friction Reynolds number $\textit {Re}_\tau \approx 3200$. The predicted friction and heat transfer coefficients closely match the DNS data with accuracy margin 1–2 %, representing a significant improvement over the current state of the art. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 183110990
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Friction and heat transfer in forced air convection with variable physical properties.
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  Data: <searchLink fieldCode="AR" term="%22Modesti%2C+Davide%22">Modesti, Davide</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> davide.modesti@gssi.it</i><br /><searchLink fieldCode="AR" term="%22Pirozzoli%2C+Sergio%22">Pirozzoli, Sergio</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 1/25/2025, Vol. 1003, p1-18. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Turbulent+boundary+layer%22">Turbulent boundary layer</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer+coefficient%22">Heat transfer coefficient</searchLink><br /><searchLink fieldCode="DE" term="%22Properties+of+fluids%22">Properties of fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Transport+theory%22">Transport theory</searchLink><br /><searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We establish a theoretical framework for predicting friction and heat transfer coefficients in variable-property forced air convection. Drawing from concepts in high-speed wall turbulence, which also involves significant temperature, viscosity and density variations, we utilize the mean momentum balance and mean thermal balance equations to develop integral transformations that account for the impact of variable fluid properties. These transformations are then applied inversely to predict the friction and heat transfer coefficients, leveraging the universality of passive scalars transport theory. Our proposed approach is validated using a comprehensive dataset from direct numerical simulations (DNS), covering both heating and cooling conditions up to a friction Reynolds number $\textit {Re}_\tau \approx 3200$. The predicted friction and heat transfer coefficients closely match the DNS data with accuracy margin 1–2 %, representing a significant improvement over the current state of the art. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press 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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    Identifiers:
      – Type: doi
        Value: 10.1017/jfm.2024.1098
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 1
    Subjects:
      – SubjectFull: Turbulent boundary layer
        Type: general
      – SubjectFull: Heat transfer coefficient
        Type: general
      – SubjectFull: Properties of fluids
        Type: general
      – SubjectFull: Transport theory
        Type: general
      – SubjectFull: Reynolds number
        Type: general
    Titles:
      – TitleFull: Friction and heat transfer in forced air convection with variable physical properties.
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            NameFull: Modesti, Davide
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            NameFull: Pirozzoli, Sergio
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          Dates:
            – D: 25
              M: 01
              Text: 1/25/2025
              Type: published
              Y: 2025
          Identifiers:
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              Value: 00221120
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            – Type: volume
              Value: 1003
          Titles:
            – TitleFull: Journal of Fluid Mechanics
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