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Boosting thermoelectric performance by employing novel fishtail shaped vortex generators in a heat exchanger: an experimental and numerical study.

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Title: Boosting thermoelectric performance by employing novel fishtail shaped vortex generators in a heat exchanger: an experimental and numerical study.
Authors: Srivastava, Kartik1 (AUTHOR), Sahoo, Rashmi Rekha1 (AUTHOR) rrsahoo.mec@itbhu.ac.in
Source: Experimental Heat Transfer. 2026, Vol. 39 Issue 4, p347-370. 24p.
Subject Terms: *Vortex generators, *Heat exchangers, *Pressure drop (Fluid dynamics), *Heat transfer coefficient, *Thermal conductivity, *Thermoelectric effects, *Thermoelectric conversion
Abstract: The present study investigates the influence of fishtail and envelope-shaped vortex generators on the performance of a heat exchanger integrated with a thermoelectric generator (TEG). The effects of the distance-to-height ratio (D/H) and the inclination angle (θ) of the vortex generator configurations on key thermohydraulic parameters – temperature distribution, pressure drop, heat transfer coefficient (HTC), Nusselt number, friction factor, and thermal enhancement factor (TEF) – along with their impact on TEG performance metrics, namely power output and conversion efficiency, are systematically analyzed. The heat exchanger and thermoelectric generator system is modeled using a one-dimensional steady-state heat transfer approach, assuming incompressible hot air flow with constant thermophysical properties. For D/H = 2, 3, and 4 at θ = 60°, the percentage increment in the HTC at the exit control volume with the highest value of HTC of fishtail and envelope VG configurations are 395.74% and 263.45%, 445.98% and 254.74%, and 357.6% and 227.9%, respectively. The difference between the highest (M90) and lowest (F30) pressure drop values is 45%, 44%, and 37.78% for D/H ratios of 2, 3, and 4, respectively. The highest TEF is exhibited by fishtail VG configuration at D/H = 2 and θ = 60° with a value of 4.39. The power output of 1.57W, 1.54W, and 1.51W is achieved for the fishtail VG arrangement for D/H values of 2, 3, and 4 at θ = 60°. However, the highest TEG conversion efficiency of 3.29% is observed for D/H = 4 at an inclination angle of 60°. The study concludes that placing the vortex generators in a smooth channel enhances the system's waste heat recovery potential. The distance-to-height ratio of 2 and angle of inclination of 60° for the fishtail VG is chosen as the best formation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193489878
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  Label: Title
  Group: Ti
  Data: Boosting thermoelectric performance by employing novel fishtail shaped vortex generators in a heat exchanger: an experimental and numerical study.
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  Data: <searchLink fieldCode="AR" term="%22Srivastava%2C+Kartik%22">Srivastava, Kartik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sahoo%2C+Rashmi+Rekha%22">Sahoo, Rashmi Rekha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rrsahoo.mec@itbhu.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22Experimental+Heat+Transfer%22">Experimental Heat Transfer</searchLink>. 2026, Vol. 39 Issue 4, p347-370. 24p.
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  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Vortex+generators%22">Vortex generators</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+exchangers%22">Heat exchangers</searchLink><br />*<searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+transfer+coefficient%22">Heat transfer coefficient</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermoelectric+effects%22">Thermoelectric effects</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermoelectric+conversion%22">Thermoelectric conversion</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The present study investigates the influence of fishtail and envelope-shaped vortex generators on the performance of a heat exchanger integrated with a thermoelectric generator (TEG). The effects of the distance-to-height ratio (D/H) and the inclination angle (θ) of the vortex generator configurations on key thermohydraulic parameters – temperature distribution, pressure drop, heat transfer coefficient (HTC), Nusselt number, friction factor, and thermal enhancement factor (TEF) – along with their impact on TEG performance metrics, namely power output and conversion efficiency, are systematically analyzed. The heat exchanger and thermoelectric generator system is modeled using a one-dimensional steady-state heat transfer approach, assuming incompressible hot air flow with constant thermophysical properties. For D/H = 2, 3, and 4 at θ = 60°, the percentage increment in the HTC at the exit control volume with the highest value of HTC of fishtail and envelope VG configurations are 395.74% and 263.45%, 445.98% and 254.74%, and 357.6% and 227.9%, respectively. The difference between the highest (M90) and lowest (F30) pressure drop values is 45%, 44%, and 37.78% for D/H ratios of 2, 3, and 4, respectively. The highest TEF is exhibited by fishtail VG configuration at D/H = 2 and θ = 60° with a value of 4.39. The power output of 1.57W, 1.54W, and 1.51W is achieved for the fishtail VG arrangement for D/H values of 2, 3, and 4 at θ = 60°. However, the highest TEG conversion efficiency of 3.29% is observed for D/H = 4 at an inclination angle of 60°. The study concludes that placing the vortex generators in a smooth channel enhances the system's waste heat recovery potential. The distance-to-height ratio of 2 and angle of inclination of 60° for the fishtail VG is chosen as the best formation. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/08916152.2025.2508480
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 24
        StartPage: 347
    Subjects:
      – SubjectFull: Vortex generators
        Type: general
      – SubjectFull: Heat exchangers
        Type: general
      – SubjectFull: Pressure drop (Fluid dynamics)
        Type: general
      – SubjectFull: Heat transfer coefficient
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Thermoelectric effects
        Type: general
      – SubjectFull: Thermoelectric conversion
        Type: general
    Titles:
      – TitleFull: Boosting thermoelectric performance by employing novel fishtail shaped vortex generators in a heat exchanger: an experimental and numerical study.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Srivastava, Kartik
      – PersonEntity:
          Name:
            NameFull: Sahoo, Rashmi Rekha
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 07
              Text: 2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 08916152
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              Value: 39
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Experimental Heat Transfer
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