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    Effect of surface wettability on evaporation using spray cooling

    Author
    Vasil, Christina
    View/Open
    178175_Vasil_rpi_0185N_11065.pdf (3.080Mb)
    Other Contributors
    Narayanan, Shankar; Rusak, Zvi; Smith, Richard N.;
    Date Issued
    2017-05
    Subject
    Mechanical engineering
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/1941
    Abstract
    In the age of Moore’s Law, high-power electronics are packing a greater number of transistors per area onto printed circuit boards. As these transistors decrease in size, their switching frequency is increased, which also increases the power losses. To meet the growing needs of thermal management in such electronics, the use of air-cooled heat sinks may be insufficient, and, thus, spray-based multiphase cooling is explored. In this study, spray cooling is investigated, and the effects of surface wettability (hydrophobic or hydrophilic) and geometry (micro-, nano- and hierarchically-structured) are quantified to determine optimal surface conditions. Additionally, this research presents methods for altering surface wettability and geometry for commonly used aluminum alloys. Spray cooling was characterized at flow rates of 0.012 mL/s and 0.0309 mL/s, for heat fluxes ranging from 9000 to 61000 W/m² on 99% aluminum surfaces. The maximum heat transfer coefficient observed was 1260 +/- 230 W/m²K on a hierarchically-porous hydrophobic surface. Moreover, improvements of up to 30% in heat transfer coefficient were observed when comparing fabricated surfaces to cleaned, plain samples. It was found that, on average, hierarchically-porous samples outperform both micro- and nano-porous, with nano-porous samples exhibiting the worst performance. In this study, hydrophobic surfaces had, on average, better heat transfer performance compared to hydrophilic samples, which may be a result of the downward-facing surface orientation.;
    Description
    May 2017; School of Engineering
    Department
    Dept. of Mechanical, Aerospace, and Nuclear Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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    • RPI Theses Online (Complete)

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