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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NET RADIATIVE HEAT EXCHANGE OF AN ORIGAMI-INSPIRED, VARIABLE EMISSIVITY SURFACE

DOI: 10.1615/TFESC1.asp.012731
pages 187-197

Rydge B. Mulford
Brigham Young University, Provo, UT 84604, USA

Matthew R. Jones
Department of Mechanical Engineering, Brigham Young University, Provo UT 84602

Brian D. Iverson
Brigham Young University, 435 Crabtree Building, Provo, Utah 84602, United States


KEY WORDS: origami, radiative heat transfer, v-groove, dynamic, thermal management, variable emissivity

Abstract

A V-grooved, origami surface may be used to control apparent emissivity and absorptivity dynamically through control of the cavity effect with linear actuation. However, for a fixed material size, the projected surface area decreases as the apparent emissivity increases. A model was developed to examine the total emission of a V-grooved surface as a function of cavity angle for both diffuse and collimated irradiation. The maximum rate of net radiative heat exchange exists at a cavity angle of 180° (unfolded) for diffuse irradiation and at or above 120° for collimated irradiation at any intrinsic emissivity value. The net radiative heat exchange for diffuse irradiation increases monotonically with increasing cavity angle; collimated irradiation normal to the projected area results in a general increase in net radiative heat exchange with increasing cavity angle but with local minimums observed at some cavity angles due to a finite, whole number of reflections. Experimental data to indicate the ability to control surface temperature with cavity angle was also collected using a vacuum chamber and Joule heating of a folded surface.

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