USE OF FINE POWDERS FOR HIGH THERMAL RESISTANCE.

D. W. Yarbrough, Wai Cheung Timothy Tong, D. L. McElroy

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

The use of fine powders to provide high thermal resistance for high-temperature industrial applications and commercial or residential appliances could provide significant energy savings. Theoretical considerations show an apparent thermal conductivity below 0. 0072 W/m multiplied by (times) K (R value equals 20 ft**2 h degree F/Btu/in. ) can be achieved by a system that blocks radiation by use of small diameter particles and increases the mean free path in the gas phase by reducing pressure. A model that includes radiative and conductive heat transfer is used to discuss the requirements for a high thermal resistance material. Thermal conductivity measurements are reported for powders with particle diameters from 7 nm to 500 mu m at pressures from t to 1. 0 multiplied by 10**5 Pa and temperatures from 296 to 339 K.
Original languageEnglish
Pages (from-to)213-225
Number of pages13
JournalHigh temperature science
Volume19
Issue number2
Publication statusPublished - 1 Apr 1984
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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