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research-article

Control of Net Radiative Heat Transfer with a Variable-Emissivity Accordion Tessellation

[+] Author and Article Information
Rydge B. Mulford

Brigham Young University, Department of Mechanical Engineering, Provo, UT, 84602
rydge.mulford@gmail.com

Vivek H. Dwivedi

NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
vivek.h.dwivedi@nasa.gov

Matthew R. Jones

Brigham Young University, Department of Mechanical Engineering, Provo, UT, 84602
mrjones@byu.edu

Brian D. Iverson

Brigham Young University, Department of Mechanical Engineering, Provo, UT, 84602
bdiverson@byu.edu

1Corresponding author.

ASME doi:10.1115/1.4042442 History: Received August 08, 2018; Revised December 17, 2018

Abstract

Origami tessellations have been proposed as a mechanism for control of radiative heat transfer through use of the cavity effect. This work explores the impact of a changing projected surface area and varying apparent radiative properties on the net radiative heat transfer of an accordion fold comprised of V-grooves. The net radiative heat transfer of an accordion tessellation is obtained by a thermal energy balance at the cavity openings with radiative properties of the cavities given as a function of various cavity parameters. Results of the analytical model are experimentally confirmed. An accordion tessellation, constructed of stainless-steel shim stock, is positioned to achieve a specified fold angle and placed in a vacuum environment while heated by Joule heating. A thermal camera records the apparent temperature of the cavity openings for various fold angles. Results are compared to apparent temperatures predicted with the analytical model. Analytically and experimentally obtained temperatures agree within 5% and all measurements fall within experimental uncertainty. For diffusely-irradiated surfaces, the decrease in projected surface area dominates, causing a continuous decrease in net radiative heat transfer for a collapsing accordion fold. Highly reflective specular surfaces exposed to diffuse irradiation experience large turn-down ratios (7.5x reduction in heat transfer) in the small angle ranges. Specular surfaces exposed to collimated irradiation achieve a turn down ratio of 3.35 between V-groove angles of 120° and 150°. The approach outlined here may be extended to modeling the net radiative heat transfer for other origami tessellations.

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