Thermal Properties of Silica Aerogel Formula
Name
Glicksman_Thermal properties.pdf
Size
1.36 MB
Format
Adobe PDF
Checksum (MD5)
4bf59f630ac07d0e0466c4402123315e
Author(s)
Cohen, Ellann
Glicksman, Leon R
Date Issued
April 2015
Journal
Journal of Heat Transfer
Publisher
American Society of Mechanical Engineers (ASME)
Citation
Cohen, Ellann, and Leon Glicksman. “Thermal Properties of Silica Aerogel Formula.” Journal of Heat Transfer 137.8 (2015): 81601.
Version
Final published version
Abstract
The thermal conductivity of silica aerogel developed in this research program was measured using the transient hot-wire technique. The thermal conductivity of monolithic samples drops significantly from 9.3 mW/m · K to 3.2 mW/m · K with modest pressure reduction from 1 atm to 0.1 atm. The same aerogel in granular form has a thermal conductivity of 15.0 mW/m · K at ambient gas pressure with a modest compression applied to compact the granules and reduce the air void sizes. Radiation heat transfer in the hot-wire test may not be representative of its contribution in large scale applications. Measurements of the monochromatic extinction coefficient over the wavelengths of interest resulted in a Rosseland mean extinction coefficient of 2400 m[superscript −1] at 300 K. The small thermal penetration distance during the hot-wire measurements suggest that in actual use radiation could contribute approximately 2.5 mW/m · K with a possible upper limit of 3.0 mW/m · K to the effective thermal conductivity over that measured using the transient hot-wire method.
MIT Department
Massachusetts Institute of Technology. Department of Architecture
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1115/1.4028901
