ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
ADAPTIVE NET RADIATIVE HEAT TRANSFER AND THERMAL MANAGEMENT WITH ORIGAMI-STRUCTURED SURFACES
Abstract
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.