Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays

Kathryn L. Kirsch, Karen Ann Thole

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Pin fin heat exchangers represent a common, viable means of keeping components cool and are widely used for electronics cooling and turbine airfoil cooling. Advancements in manufacturing technology will allow these heat exchangers to be built using new methods, such as laser powder bed fusion, a form of additive manufacturing. New manufacturing approaches, however, render a direct comparison between newly and conventionally manufactured parts meaningless without a good understanding of the difference in the performance. This research study investigated microchannel pin fin arrays that were manufactured using Laser Powder Bed Fusion and compared them to studies of pin fin arrays from the literature, which are representative of traditionally-manufactured pin fin arrays, where the pin and endwall surfaces exhibited much lower surface roughness. Pin fin arrays with four different spacings were manufactured and tested over a range of Reynolds numbers; pressure loss and heat transfer measurements were taken. Additionally, the test coupons were evaluated nondestructively and the as-built geometric features were analyzed. Measured surface roughness was found to be extremely high in each one of the microchannel pin fin arrays and was found to be a function of the pin spacing in the array, as was the shape of the pin itself; with more pins in the array came higher surface roughness and more distorted pin shapes. Comparisons between the smooth pin fin arrays from literature and the rough pin fin arrays from the current study showed that the high surface roughness more strongly affected the friction factor augmentation than it did the heat transfer augmentation relative to the smooth pin fin arrays.

    Original languageEnglish (US)
    Pages (from-to)2502-2513
    Number of pages12
    JournalInternational Journal of Heat and Mass Transfer
    Volume108
    DOIs
    StatePublished - Jan 1 2017

    Fingerprint

    fins
    Surface roughness
    heat transfer
    Heat transfer
    Microchannels
    Powders
    Heat exchangers
    3D printers
    Fusion reactions
    Electronic cooling
    Fins (heat exchange)
    Lasers
    Airfoils
    surface roughness
    Reynolds number
    Turbines
    Friction
    Cooling
    manufacturing
    heat exchangers

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

    Cite this

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    abstract = "Pin fin heat exchangers represent a common, viable means of keeping components cool and are widely used for electronics cooling and turbine airfoil cooling. Advancements in manufacturing technology will allow these heat exchangers to be built using new methods, such as laser powder bed fusion, a form of additive manufacturing. New manufacturing approaches, however, render a direct comparison between newly and conventionally manufactured parts meaningless without a good understanding of the difference in the performance. This research study investigated microchannel pin fin arrays that were manufactured using Laser Powder Bed Fusion and compared them to studies of pin fin arrays from the literature, which are representative of traditionally-manufactured pin fin arrays, where the pin and endwall surfaces exhibited much lower surface roughness. Pin fin arrays with four different spacings were manufactured and tested over a range of Reynolds numbers; pressure loss and heat transfer measurements were taken. Additionally, the test coupons were evaluated nondestructively and the as-built geometric features were analyzed. Measured surface roughness was found to be extremely high in each one of the microchannel pin fin arrays and was found to be a function of the pin spacing in the array, as was the shape of the pin itself; with more pins in the array came higher surface roughness and more distorted pin shapes. Comparisons between the smooth pin fin arrays from literature and the rough pin fin arrays from the current study showed that the high surface roughness more strongly affected the friction factor augmentation than it did the heat transfer augmentation relative to the smooth pin fin arrays.",
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    Pressure loss and heat transfer performance for additively and conventionally manufactured pin fin arrays. / Kirsch, Kathryn L.; Thole, Karen Ann.

    In: International Journal of Heat and Mass Transfer, Vol. 108, 01.01.2017, p. 2502-2513.

    Research output: Contribution to journalArticle

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