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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

ADAPTIVE NET RADIATIVE HEAT TRANSFER AND THERMAL MANAGEMENT WITH ORIGAMI-STRUCTURED SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC16.rti.023600
pages 8405-8413

Résumé

The ability to control radiative behavior through the angular positioning of structured surfaces (e.g. the cavity effect) offers the ability to provide thermal management in dynamic radiative environments. Structures comprised of origami tessellations offer a means to achieve angular cavities that approach black-like behavior during collapse by exploiting use of the cavity effect. Expanded origami surfaces exhibit intrinsic radiative properties while collapsed surfaces exhibit increasingly black-like behavior as the cavity aspect ratio increases. Actuation of such surfaces provides the means to achieve any apparent radiative behavior between these two extremes. This work explores the use of three origami structures (finite V-groove, hinged V-groove and Miura-ori) and their respective apparent radiative properties as a function of cavity geometry using Monte Carlo ray tracing. Results are presented as a function of tessellation geometry and degree of actuation (i.e. collapse). Ray tracing models are benchmarked with V-groove geometries for which analytical models exist in the literature. Convergence for ray independence was determined to be satisfactory when the standard error of the mean for every test case was less than 0.005. Deviation in the apparent absorptivity for finite V-groove relative to the infinite V-groove is quantified. The apparent absorptivity of the Miura-ori fold exhibits sensitivity to the fold geometry when the angle of the unit cell is varied, but is relatively insensitive to the length ratio of the panel. The variable nature of the net radiative heat transfer, achievable through actuation, affords a method for thermal management of components with variable heat dissipation and/or variable radiative environments.