Page 188

NASA EPSCoR Research Infrastructure Development (RID) Dynamic Control of Surface Radiative Properties through Actuation of Origami-Inspired Surface Topographies ScPIs: Brian D. Iverson and Matthew R. Jones

The objective of this work is to dynamically control the apparent radiative surface properties through topographical actuation of origamiinspired surfaces. Cavities on a surface increase the absorption and emission relative to a smooth surface of the same material. When radiation enters a cavity, reflections and re-reflections provide additional opportunity for energy absorption. Multiple reflections within a heated cavity also increase the emissive power. This increase in absorption and emission for high aspect ratio cavities has been termed the cavity effect. Origami-based structures such as the miura-ori and even simple accordion folds may be used to create surface topographies comprised of v-groove cavities. Origami structures have been shown to be an effective compliant mechanism for actuation and positioning. This work has investigated the use of origami-inspired surfaces to provide an adaptive surface topology and to achieve dynamic control of the absorption and emission of radiation on a surface. Dynamic control of radiative surface

properties is beneficial in many applications, and is especially critical in space where radiative heat transfer plays a dominant role in thermal management. Two experimental facilities have been designed to measure the apparent absorptivity and apparent emissivity of folded surfaces. Since these radiative properties cannot be measured directly, inverse heat transfer models have also been developed to utilize temperature measurements to characterize the radiative properties. This work has been presented at the 2014 ASME International Mechanical Engineering Congress and Exposition and has been submitted for journal publication. Ongoing work to characterize the net radiative heat transfer for varying cavity angle will allow the indirect measurement of apparent emissivity and will be presented at the 2015 American Society of Thermal Fluid Engineers TFESC conference. With these two facilities, we are poised to investigate tessellated surfaces created by origami fold patterns.

When exposed to the same radiative heating condition, a folded surface with a characteristic angle of 14째 has a much higher rise in temperature (due to higher apparent absorption) than the same surface when it is flat.

Sample folded surfaces that create cavity-like topographies and can transition to highly absorbing surfaces.



NASA EPSCoR Stimuli 2014 -15

EPSCoR Stimuli 2014-15  

NASA Office of Education’s Aerospace Research & Career Development (ARCD) is pleased to release NASA EPSCoR Stimuli, a collection of univers...

Read more
Read more
Similar to
Popular now
Just for you