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

doi:10.1002/ppsc.200400943

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 journal › Article › peer-review

32 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 language	English
Pages (from-to)	268-275
Number of pages	8
Journal	Particle and Particle Systems Characterization
Volume	21
Issue number	4
DOIs	https://doi.org/10.1002/ppsc.200400943
State	Published - Nov 2004
Externally published	Yes

Keywords

Contact points
Gas pressure
Powders
Thermal conductivity

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10.1002/ppsc.200400943

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

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.",

keywords = "Contact points, Gas pressure, Powders, Thermal conductivity",

author = "Michael Shapiro and Vladislav Dudko and Victor Royzen and Yuri Krichevets and Samuel Lekhtmakher and Victor Grozubinsky and Moshe Shapira and Moti Brill",

year = "2004",

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doi = "10.1002/ppsc.200400943",

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pages = "268--275",

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T2 - Effect of Gas Pressure on the Thermal Resistance of Particle Contact Points

AU - Shapiro, Michael

AU - Dudko, Vladislav

AU - Royzen, Victor

AU - Krichevets, Yuri

AU - Lekhtmakher, Samuel

AU - Grozubinsky, Victor

AU - Shapira, Moshe

AU - Brill, Moti

PY - 2004/11

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N2 - 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.

AB - 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.

KW - Contact points

KW - Gas pressure

KW - Powders

KW - Thermal conductivity

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DO - 10.1002/ppsc.200400943

M3 - 文章

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JO - Particle and Particle Systems Characterization

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

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Keywords

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