Presenter(s)

    Natalie Starr Douglass

    Comments

    Presentation: 9:00 a.m.-10:15 a.m., Kennedy Union Ballroom

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    Description

    Radiative fin technology is used in a wide variety of applications: automotive, electronics, and space. However, radiative fin is generally only analyzed along the thickness profile. This work analyzes radiative fin planar geometry and thickness profile in tandem. From there, the findings are used to investigate a novel dynamic spacecraft radiator system. Fins are analyzed to optimize for a variety of performance criteria, including maximum heat transfer, tip temperature, or fin efficiency. For analysis of both static and dynamic fins, a two-dimensional mathematical heat transfer model is developed. It is found that a triangular thickness profile is most critical for heat rate maximization. A fin with a triangular thickness profile increases heat rate by 38.8% when compared to a fin with identical planar geometry and volume, but with a uniform thickness profile. Planar shape is also found to influence fin performance. A fin with a rectangular planar geometry has a 6.8% increase in heat transfer as compared to a fin with a triangular planar geometry and identical thickness profile and volume. Additionally, it is also found that triangular thickness profiles produce the maximally efficient fins. Following these results, a novel design for a dynamic spacecraft radiator with annular geometry and varied thickness is presented. It is found that turndown ratios of 3.33 are capable with the novel system. Furthermore, it was found that fins with tapered thickness profile have the highest efficiency and turndown ratio. Finally, it is shown that turndown ratio and fin efficiency decrease as operating temperature increase.

    Publication Date

    4-20-2022

    Project Designation

    Independent Research

    Primary Advisor

    Rydge Blue Mulford

    Primary Advisor's Department

    Mechanical and Aerospace Engineering

    Keywords

    Stander Symposium project, School of Engineering

    United Nations Sustainable Development Goals

    Industry, Innovation, and Infrastructure

    A Numerical Study of Radiative Fin Performance with an Emphasis on Geometry and Spacecraft Applications

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