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A Study on Flow Transition and Development in Circular and Rectangular Ducts.

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Title: A Study on Flow Transition and Development in Circular and Rectangular Ducts.
Authors: Zanoun, E.-S.1, Kito, M.2, Egbers, C.1
Source: Journal of Fluids Engineering. Jun2009, Vol. 131 Issue 6, p061204:1-061204:10. 10p. 4 Diagrams, 14 Graphs.
Subjects: Reynolds number, Speed, Hot-wire anemometer, Wind speed measurement, Turbulence, Fluid dynamics, Transition flow, Motion, Aerodynamics, Wind pressure
Abstract: The present paper reports observations on some aspects regarding the dependence of the transition Reynolds number and flow development on the inlet flow conditions and the entrance length in circular and rectangular ducts for Rem ≤ 106 × 103, where Rem is the Reynolds number based on the bulk flow velocity (Ūb) and the duct integral length scale (D). The hot-wire anemometer was used to carry out measurements close to the circular duct exit; however, the laser-Doppler anemometry was utilized for the rectangular duct measurements. Particular considerations were given to the bulk flow velocity, the mean-velocity profile, the centerline-average-velocity, and the centerline turbulence statistics to the fourth order. Transition criteria in both ducts were discussed, reflecting effects of flow geometry, entrance flow conditions, and entrance length on the transition Reynolds number A laminar behavior was maintained up to Rem ≈ 15.4 × 103 and Rem ≈ 2 × 103 in the circular and rectangular ducts, respectively, and the transition was observed to take place at different downstream positions as the inlet flow velocity varied. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers 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
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PubType: Academic Journal
PubTypeId: academicJournal
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IllustrationInfo
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  Data: A Study on Flow Transition and Development in Circular and Rectangular Ducts.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluids+Engineering%22">Journal of Fluids Engineering</searchLink>. Jun2009, Vol. 131 Issue 6, p061204:1-061204:10. 10p. 4 Diagrams, 14 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink><br /><searchLink fieldCode="DE" term="%22Speed%22">Speed</searchLink><br /><searchLink fieldCode="DE" term="%22Hot-wire+anemometer%22">Hot-wire anemometer</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+speed+measurement%22">Wind speed measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+flow%22">Transition flow</searchLink><br /><searchLink fieldCode="DE" term="%22Motion%22">Motion</searchLink><br /><searchLink fieldCode="DE" term="%22Aerodynamics%22">Aerodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+pressure%22">Wind pressure</searchLink>
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  Data: The present paper reports observations on some aspects regarding the dependence of the transition Reynolds number and flow development on the inlet flow conditions and the entrance length in circular and rectangular ducts for Rem ≤ 106 × 103, where Rem is the Reynolds number based on the bulk flow velocity (Ūb) and the duct integral length scale (D). The hot-wire anemometer was used to carry out measurements close to the circular duct exit; however, the laser-Doppler anemometry was utilized for the rectangular duct measurements. Particular considerations were given to the bulk flow velocity, the mean-velocity profile, the centerline-average-velocity, and the centerline turbulence statistics to the fourth order. Transition criteria in both ducts were discussed, reflecting effects of flow geometry, entrance flow conditions, and entrance length on the transition Reynolds number A laminar behavior was maintained up to Rem ≈ 15.4 × 103 and Rem ≈ 2 × 103 in the circular and rectangular ducts, respectively, and the transition was observed to take place at different downstream positions as the inlet flow velocity varied. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=42857256
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1115/1.3112384
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 061204:1
    Subjects:
      – SubjectFull: Reynolds number
        Type: general
      – SubjectFull: Speed
        Type: general
      – SubjectFull: Hot-wire anemometer
        Type: general
      – SubjectFull: Wind speed measurement
        Type: general
      – SubjectFull: Turbulence
        Type: general
      – SubjectFull: Fluid dynamics
        Type: general
      – SubjectFull: Transition flow
        Type: general
      – SubjectFull: Motion
        Type: general
      – SubjectFull: Aerodynamics
        Type: general
      – SubjectFull: Wind pressure
        Type: general
    Titles:
      – TitleFull: A Study on Flow Transition and Development in Circular and Rectangular Ducts.
        Type: main
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            NameFull: Zanoun, E.-S.
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            NameFull: Kito, M.
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            NameFull: Egbers, C.
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            – D: 01
              M: 06
              Text: Jun2009
              Type: published
              Y: 2009
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              Value: 131
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