Characterization of Powder Beds by Thermal Conductivity: Effect of Gas Pressure on the Thermal Resistance of Particle Contact Points

Michael Shapiro*, Vladislav Dudko, Victor Royzen, Yuri Krichevets, Samuel Lekhtmakher, Victor Grozubinsky, Moshe Shapira, Moti Brill

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The thermal conductivity of ceramic powder packed beds was measured at temperatures below 100°C for various powder sizes and compositions and under different gas atmospheres. Measurements at low pressures (down to 10 Pa) combined with a theoretical model allowed the elucidation of geometrical and thermal resistance parameters for the contact points between granules. The gap thickness and contact point size were found to be well correlated with the mean particle size. The thermal conductivities of all powders at low pressure were found to differ at most by a factor of two, whereas the solid-phase conductivities of the powder materials differed by more than one order of magnitude. A theoretical model accounting for the size-dependence of contact point conductivity is incorporated to rationalize this trend.

Original languageEnglish
Pages (from-to)268-275
Number of pages8
JournalParticle and Particle Systems Characterization
Volume21
Issue number4
DOIs
StatePublished - Nov 2004
Externally publishedYes

Keywords

  • Contact points
  • Gas pressure
  • Powders
  • Thermal conductivity

Fingerprint Dive into the research topics of 'Characterization of Powder Beds by Thermal Conductivity: Effect of Gas Pressure on the Thermal Resistance of Particle Contact Points'. Together they form a unique fingerprint.

Cite this