Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels

Curtis K. Stimpson, Jacob C. Snyder, Karen Ann Thole, Dominic Mongillo

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    Additive manufacturing (AM) with metal powder has made possible the fabrication of gas turbine components with small and complex flow paths that cannot be achieved with any other manufacturing technology presently available. The increased design space of AM allows turbine designers to develop advanced cooling schemes in high temperature components to increase cooling efficiency. Inherent in AM with metals is the large surface roughness that cannot be removed from small internal geometries. Such roughness has been shown in previous studies to significantly augment pressure loss and heat transfer of small channels. However, the roughness on these channels or other surfaces made from AM with metal powder has not been thoroughly characterized for scaling pressure loss and heat transfer data. This study examines the roughness of the surfaces of channels of various hydraulic length scales made with direct metal laser sintering (DMLS). Statistical roughness parameters are presented along with other parameters that others have found to correlate with flow and heat transfer. The pressure loss and heat transfer previously reported for the DMLS channels studied in this work are compared to the physical roughness measurements. Results show that the relative arithmetic mean roughness correlates well with the relative equivalent sand grain roughness. A correlation is presented to predict the Nusselt number of flow through AM channels which gives better predictions of heat transfer than correlations currently available.

    Original languageEnglish (US)
    Title of host publicationHeat Transfer
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791849798
    DOIs
    StatePublished - Jan 1 2016
    EventASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016 - Seoul, Korea, Republic of
    Duration: Jun 13 2016Jun 17 2016

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume5B-2016

    Other

    OtherASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016
    CountryKorea, Republic of
    CitySeoul
    Period6/13/166/17/16

    Fingerprint

    3D printers
    Surface roughness
    Heat transfer
    Powder metals
    Sintering
    Metals
    Cooling
    Roughness measurement
    Turbine components
    Lasers
    Nusselt number
    Gas turbines
    Turbines
    Sand
    Hydraulics
    Fabrication
    Geometry

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Stimpson, C. K., Snyder, J. C., Thole, K. A., & Mongillo, D. (2016). Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels. In Heat Transfer (Proceedings of the ASME Turbo Expo; Vol. 5B-2016). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2016-58093
    Stimpson, Curtis K. ; Snyder, Jacob C. ; Thole, Karen Ann ; Mongillo, Dominic. / Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels. Heat Transfer. American Society of Mechanical Engineers (ASME), 2016. (Proceedings of the ASME Turbo Expo).
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    abstract = "Additive manufacturing (AM) with metal powder has made possible the fabrication of gas turbine components with small and complex flow paths that cannot be achieved with any other manufacturing technology presently available. The increased design space of AM allows turbine designers to develop advanced cooling schemes in high temperature components to increase cooling efficiency. Inherent in AM with metals is the large surface roughness that cannot be removed from small internal geometries. Such roughness has been shown in previous studies to significantly augment pressure loss and heat transfer of small channels. However, the roughness on these channels or other surfaces made from AM with metal powder has not been thoroughly characterized for scaling pressure loss and heat transfer data. This study examines the roughness of the surfaces of channels of various hydraulic length scales made with direct metal laser sintering (DMLS). Statistical roughness parameters are presented along with other parameters that others have found to correlate with flow and heat transfer. The pressure loss and heat transfer previously reported for the DMLS channels studied in this work are compared to the physical roughness measurements. Results show that the relative arithmetic mean roughness correlates well with the relative equivalent sand grain roughness. A correlation is presented to predict the Nusselt number of flow through AM channels which gives better predictions of heat transfer than correlations currently available.",
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    Stimpson, CK, Snyder, JC, Thole, KA & Mongillo, D 2016, Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels. in Heat Transfer. Proceedings of the ASME Turbo Expo, vol. 5B-2016, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016, Seoul, Korea, Republic of, 6/13/16. https://doi.org/10.1115/GT2016-58093

    Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels. / Stimpson, Curtis K.; Snyder, Jacob C.; Thole, Karen Ann; Mongillo, Dominic.

    Heat Transfer. American Society of Mechanical Engineers (ASME), 2016. (Proceedings of the ASME Turbo Expo; Vol. 5B-2016).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    Stimpson CK, Snyder JC, Thole KA, Mongillo D. Scaling roughness effects on pressure loss and heat transfer of additively manufactured channels. In Heat Transfer. American Society of Mechanical Engineers (ASME). 2016. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT2016-58093