Experimental measurements of the thermal conductivity of ash deposits: Part 1. Measurement technique

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Description

This paper describes a technique developed to make in situ, time-resolved measurements of the effective thermal conductivity of ash deposits formed under conditions that closely replicate those found in the convective pass of a commercial boiler. Since ash deposit thermal conductivity is thought to be strongly dependent on deposit microstructure, the technique is designed to minimize the disturbance of the natural deposit microstructure. Traditional techniques for measuring deposit thermal conductivity generally do not preserve the sample microstructure. Experiments are described that demonstrate the technique, quantify experimental uncertainty, and determine the thermal conductivity of highly porous, unsintered deposits. The average measured ... continued below

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36 p.

Creation Information

Robinson, A. L.; Buckley, S. G.; Yang, N. & Baxter, L. L. April 1, 2000.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 14 times . More information about this report can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

This paper describes a technique developed to make in situ, time-resolved measurements of the effective thermal conductivity of ash deposits formed under conditions that closely replicate those found in the convective pass of a commercial boiler. Since ash deposit thermal conductivity is thought to be strongly dependent on deposit microstructure, the technique is designed to minimize the disturbance of the natural deposit microstructure. Traditional techniques for measuring deposit thermal conductivity generally do not preserve the sample microstructure. Experiments are described that demonstrate the technique, quantify experimental uncertainty, and determine the thermal conductivity of highly porous, unsintered deposits. The average measured conductivity of loose, unsintered deposits is 0.14 {+-} 0.03 W/(m K), approximately midway between rational theoretical limits for deposit thermal conductivity.

Physical Description

36 p.

Notes

OSTI as DE00755936

Medium: P; Size: 36 pages

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  • Other Information: PBD: 1 Apr 2000

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  • Report No.: SAND2000-8599
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/755936 | External Link
  • Office of Scientific & Technical Information Report Number: 755936
  • Archival Resource Key: ark:/67531/metadc710297

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  • April 1, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:11 p.m.

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Robinson, A. L.; Buckley, S. G.; Yang, N. & Baxter, L. L. Experimental measurements of the thermal conductivity of ash deposits: Part 1. Measurement technique, report, April 1, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710297/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.