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TECHNICAL PAPERS: Fluids/Heat/Transport

Comparison of Thermal Insulation Performance of Fibrous Materials for the Advanced Space Suit

[+] Author and Article Information
Heather L. Paul, Kenneth R. Diller

Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712

J Biomech Eng 125(5), 639-647 (Oct 09, 2003) (9 pages) doi:10.1115/1.1611885 History: Received June 28, 2001; Revised April 25, 2003; Online October 09, 2003
Copyright © 2003 by ASME
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References

Figures

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Layered structure of the current EMU material. The outer layers function as a thermal micrometeoroid garment (TMG).
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Scanning electron micrographs of cut fiber cross-sections. (a) solid polyester fiber cross section (25 μm diameter); (b) Dupont Holofill II® fiber cross section (∼25 μm outer diameter with four 6 μm holes); (c) 4DG™ fiber cross section (oblong dimensions: 34 μm×47 μm).
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Thermal conductivity for aerogel and aerogel and an opacificing agent as a function of pressure (manufacturer’s data) 18
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Model cross-sectional dimensions of the (a) solid, (b) hollow, and (c) 4DG™ fibers (dimensions in microns). 6 denier is on the left and 15 denier on the right.
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Surface distribution of heat flux for a simulation of a solid fiber with argon gas interstitium, low void fraction and perpendicular orientation of the fiber with the temperature gradient (heat flux units are W/m2 ). This subsystem represents the smallest repeated structural unit of the insulation with full material thickness and a single fiber with its surrounding interstitium.
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Effective thermal conductivity of 15 denier fiber insulation materials for low interstitial void fraction as a function of fiber type, interstitial medium and fiber orientation
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Effective thermal conductivity of 15 denier fiber insulation materials for high interstitial void fraction as a function of fiber type, interstitial medium and fiber orientation. Note that the data for the perpendicular orientations are so similar that the curves are indistinguishable.

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