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Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns

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  • Luigi Ventola

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
    Current address: DENSO Thermal Systems, Poirino (TO)-Italy.
    These authors contributed equally to this work.)

  • Matteo Fasano

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
    These authors contributed equally to this work.)

  • Roberta Cappabianca

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Luca Bergamasco

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Francesca Clerici

    (Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Luciano Scaltrito

    (Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Eliodoro Chiavazzo

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Pietro Asinari

    (Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

Abstract

The efficient dissipation of localized heat flux by convection is a key request in several engineering applications, especially electronic ones. The recent advancements in manufacturing processes are unlocking the design and industrialization of heat exchangers with unprecedented geometric characteristics and, thus, performance. In this work, laser etching manufacturing technique is employed to develop metal surfaces with designed microstructured surface patterns. Such precise control of the solid-air interface ( artificial roughness ) allows to manufacture metal heat sinks with enhanced thermal transmittance with respect to traditional flat surfaces. Here, the thermal performance of these laser-etched devices is experimentally assessed by means of a wind tunnel in a fully turbulent regime. At the highest Reynolds number tested in the experiments ( R e L ≈ 16 , 500 ), elliptic scale-roughened surfaces show thermal transmittances improved by up to 81% with respect to heat sinks with flat surface. At similar testing conditions, cones patterns provide an enhancement in Nusselt number and thermal transmittance of up to 102% and 357%, respectively. The latter results are correlated with the main geometric and thermal fluid dynamics descriptors of the convective heat transfer process in order to achieve a predictive model of their performance. The experimental evidence shown in this work may encourage and guide a broader use of micro-patterned surfaces for enhancing convective heat transfer in heat exchangers.

Suggested Citation

  • Luigi Ventola & Matteo Fasano & Roberta Cappabianca & Luca Bergamasco & Francesca Clerici & Luciano Scaltrito & Eliodoro Chiavazzo & Pietro Asinari, 2020. "Convective Heat Transfer Enhancement through Laser-Etched Heat Sinks: Elliptic Scale-Roughened and Cones Patterns," Energies, MDPI, vol. 13(6), pages 1-16, March.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1360-:d:332716
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    References listed on IDEAS

    as
    1. Jafari, Davoud & Wits, Wessel W., 2018. "The utilization of selective laser melting technology on heat transfer devices for thermal energy conversion applications: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 420-442.
    2. Luigi Ventola & Gabriele Curcuruto & Matteo Fasano & Saverio Fotia & Vincenzo Pugliese & Eliodoro Chiavazzo & Pietro Asinari, 2016. "Unshrouded Plate Fin Heat Sinks for Electronics Cooling: Validation of a Comprehensive Thermal Model and Cost Optimization in Semi-Active Configuration," Energies, MDPI, vol. 9(8), pages 1-16, August.
    3. Garimella, Suresh V. & Persoons, Tim & Weibel, Justin & Yeh, Lian-Tuu, 2013. "Technological drivers in data centers and telecom systems: Multiscale thermal, electrical, and energy management," Applied Energy, Elsevier, vol. 107(C), pages 66-80.
    4. Idris Al Siyabi & Sourav Khanna & Tapas Mallick & Senthilarasu Sundaram, 2018. "Multiple Phase Change Material (PCM) Configuration for PCM-Based Heat Sinks—An Experimental Study," Energies, MDPI, vol. 11(7), pages 1-14, June.
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    Cited by:

    1. Caket, Ahmet Guray & Wang, Chunyang & Nugroho, Marvel Alif & Celik, Hasan & Mobedi, Moghtada, 2022. "Recent studies on 3D lattice metal frame technique for enhancement of heat transfer: Discovering trends and reasons," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).
    2. Łukasz J. Orman & Norbert Radek & Jacek Pietraszek & Marcin Szczepaniak, 2020. "Analysis of Enhanced Pool Boiling Heat Transfer on Laser—Textured Surfaces," Energies, MDPI, vol. 13(11), pages 1-19, May.

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