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Title: Effective thermal conductivity within packed beds of spherical particles

Abstract

An investigation of the effective thermal conductivity of packed beds of spherical particles was conducted. Included is a brief review of related analytical and experimental investigations, along with a description of the results from an experimental program. Five beds of different materials were evaluated to determine the effective thermal conductivity as a function of the mechanical load on the bed, the conductivity of the bed material, and the interstitial gaseous environment surrounding the bed particles. The effective thermal conductivity of the packed beds were found to be dependent upon the thermal conductivity of the bed material sand the axial load. The presence of an interstitial gas increased the effective thermal conductivity of the bed by a factor of two in almost all cases. The experimental results obtained for vacuum conditions were compared with two existing analytical models that assumed elastic deformation of the spheres. The analytical models slightly underpredicted the effective thermal conductivity for hard materials with low thermal conductivities below the elastic limit for these materials. For soft materials with relatively high thermal conductivities, the analytical models overpredicted the effective thermal conductivity by as much as an order of magnitude.

Authors:
 [1]; ;  [2]
  1. Univ. of Notre Dame, IN (United States)
  2. Texas A and M Univ., College Station (United States)
Publication Date:
OSTI Identifier:
6102758
Resource Type:
Journal Article
Journal Name:
Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)
Additional Journal Information:
Journal Volume: 111:4; Journal ID: ISSN 0022-1481
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PACKED BED; MATHEMATICAL MODELS; THERMAL CONDUCTIVITY; CATALYSTS; CATALYTIC CONVERTERS; FUEL ELEMENT CLUSTERS; HEAT EXCHANGERS; SPHERES; THERMAL INSULATION; EQUIPMENT; FUEL ASSEMBLIES; PHYSICAL PROPERTIES; POLLUTION CONTROL EQUIPMENT; THERMODYNAMIC PROPERTIES; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Duncan, A B, Peterson, G P, and Fletcher, L S. Effective thermal conductivity within packed beds of spherical particles. United States: N. p., 1989. Web. doi:10.1115/1.3250793.
Duncan, A B, Peterson, G P, & Fletcher, L S. Effective thermal conductivity within packed beds of spherical particles. United States. https://doi.org/10.1115/1.3250793
Duncan, A B, Peterson, G P, and Fletcher, L S. 1989. "Effective thermal conductivity within packed beds of spherical particles". United States. https://doi.org/10.1115/1.3250793.
@article{osti_6102758,
title = {Effective thermal conductivity within packed beds of spherical particles},
author = {Duncan, A B and Peterson, G P and Fletcher, L S},
abstractNote = {An investigation of the effective thermal conductivity of packed beds of spherical particles was conducted. Included is a brief review of related analytical and experimental investigations, along with a description of the results from an experimental program. Five beds of different materials were evaluated to determine the effective thermal conductivity as a function of the mechanical load on the bed, the conductivity of the bed material, and the interstitial gaseous environment surrounding the bed particles. The effective thermal conductivity of the packed beds were found to be dependent upon the thermal conductivity of the bed material sand the axial load. The presence of an interstitial gas increased the effective thermal conductivity of the bed by a factor of two in almost all cases. The experimental results obtained for vacuum conditions were compared with two existing analytical models that assumed elastic deformation of the spheres. The analytical models slightly underpredicted the effective thermal conductivity for hard materials with low thermal conductivities below the elastic limit for these materials. For soft materials with relatively high thermal conductivities, the analytical models overpredicted the effective thermal conductivity by as much as an order of magnitude.},
doi = {10.1115/1.3250793},
url = {https://www.osti.gov/biblio/6102758}, journal = {Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)},
issn = {0022-1481},
number = ,
volume = 111:4,
place = {United States},
year = {Wed Nov 01 00:00:00 EST 1989},
month = {Wed Nov 01 00:00:00 EST 1989}
}