A novel approach to determine thermal conductivity of micron-sized fuel particles

Xuefeng Zhang; Ezra Bar-Ziv

doi:10.1080/00102209708935738

A novel approach to determine thermal conductivity of micron-sized fuel particles

Xuefeng Zhang, Ezra Bar-Ziv

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

A novel approach to determine absolute values of thermal conductivity of single micron-sized particles, has been developed. A particle was suspended in an electrodynamic chamber and was unevenly irradiated to impose a temperature gradient within the particle, by a focused CO₂ laser beam. Consequently, a photophoretic force was generated from which the particle thermal conductivity was determined. Maximum uncertainty was estimated to be about 25%. Thermal conductivity of highly porous char particles was measured as a function temperature, in the range of 350-1150 K, showing increase of thermal conductivity with temperature.

Original language	English
Pages (from-to)	79-95
Number of pages	17
Journal	Combustion Science and Technology
Volume	130
Issue number	1-6
DOIs	https://doi.org/10.1080/00102209708935738
State	Published - 1 Jan 1997

Keywords

Coal particle
Electrodynamic chamber
Photophoretic force
Thermal conductivity

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
General Physics and Astronomy

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10.1080/00102209708935738

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title = "A novel approach to determine thermal conductivity of micron-sized fuel particles",

abstract = "A novel approach to determine absolute values of thermal conductivity of single micron-sized particles, has been developed. A particle was suspended in an electrodynamic chamber and was unevenly irradiated to impose a temperature gradient within the particle, by a focused CO2 laser beam. Consequently, a photophoretic force was generated from which the particle thermal conductivity was determined. Maximum uncertainty was estimated to be about 25\%. Thermal conductivity of highly porous char particles was measured as a function temperature, in the range of 350-1150 K, showing increase of thermal conductivity with temperature.",

keywords = "Coal particle, Electrodynamic chamber, Photophoretic force, Thermal conductivity",

author = "Xuefeng Zhang and Ezra Bar-Ziv",

note = "Funding Information: The authors are grateful for the support from a US-Israel Binational Science Foundation grant No. 9400077/2. X. Z. wishes to acknowledge the support from the Department of Mechanical Engineering, Ben-Gurion University of The Negev.",

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AU - Bar-Ziv, Ezra

N1 - Funding Information: The authors are grateful for the support from a US-Israel Binational Science Foundation grant No. 9400077/2. X. Z. wishes to acknowledge the support from the Department of Mechanical Engineering, Ben-Gurion University of The Negev.

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N2 - A novel approach to determine absolute values of thermal conductivity of single micron-sized particles, has been developed. A particle was suspended in an electrodynamic chamber and was unevenly irradiated to impose a temperature gradient within the particle, by a focused CO2 laser beam. Consequently, a photophoretic force was generated from which the particle thermal conductivity was determined. Maximum uncertainty was estimated to be about 25%. Thermal conductivity of highly porous char particles was measured as a function temperature, in the range of 350-1150 K, showing increase of thermal conductivity with temperature.

AB - A novel approach to determine absolute values of thermal conductivity of single micron-sized particles, has been developed. A particle was suspended in an electrodynamic chamber and was unevenly irradiated to impose a temperature gradient within the particle, by a focused CO2 laser beam. Consequently, a photophoretic force was generated from which the particle thermal conductivity was determined. Maximum uncertainty was estimated to be about 25%. Thermal conductivity of highly porous char particles was measured as a function temperature, in the range of 350-1150 K, showing increase of thermal conductivity with temperature.

KW - Coal particle

KW - Electrodynamic chamber

KW - Photophoretic force

KW - Thermal conductivity

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A novel approach to determine thermal conductivity of micron-sized fuel particles

Abstract

Keywords

ASJC Scopus subject areas

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