Fundamental studies of erosion for coal gasification systems. Annual progress report, 1 November 1979-30 June 1980

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The effort in this program is divided between modelling the particle impact event using numerical methods and computer calculations and actual measurement of erosion rates. While the results obtained from each of these activities must be combined to provide an improved understanding of particulate erosion of ductile materials, it is convenient to describe separately the progress in each activity area. The first step in the application of the finite element method to any problem is the dissolution of the continuum into small elements. The intent of this procedure is to use as few total elements as possible and to make ... continued below

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Pages: 45

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Follansbee, P. S.; Sinclair, G. B. & Williams, J. C. July 27, 1980.

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Description

The effort in this program is divided between modelling the particle impact event using numerical methods and computer calculations and actual measurement of erosion rates. While the results obtained from each of these activities must be combined to provide an improved understanding of particulate erosion of ductile materials, it is convenient to describe separately the progress in each activity area. The first step in the application of the finite element method to any problem is the dissolution of the continuum into small elements. The intent of this procedure is to use as few total elements as possible and to make the elements small where gradients are large and vice versa. The exact solution for the contact of a rigid cylinder with an elastic surface is available from Hertz. This solution has been compared with the computer results obtained from finite element maps containing 148, 273, and 474 elements. The correlation between the computer results and elastic solution is not good for the map with the fewest elements, but improves as the number of elements increases. Convergence to this exact solution has been examined as a function of the number of map elements as a means of improving the efficiency of the design process used to obtain the maps. Having done this, the next step was to include the effects of plasticity. In order to validate the model, the measurement of erosion rates and observation of damage on eroded samples is necessary. Since it takes billions of impacts to lead to measurable weight loss, the experiment must be carefully designed to assure meaningful results. Three facets of the experimental portion of this study are described: the construction of the erosion apparatus, the characterization of the erosion environment and the preliminary erosion results.

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Pages: 45

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NTIS, PC A03/MF A01.

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  • Report No.: DOE/ER/10468-1
  • Grant Number: AC02-79ER10468
  • DOI: 10.2172/5123917 | External Link
  • Office of Scientific & Technical Information Report Number: 5123917
  • Archival Resource Key: ark:/67531/metadc1057541

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • July 27, 1980

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 10:27 p.m.

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Follansbee, P. S.; Sinclair, G. B. & Williams, J. C. Fundamental studies of erosion for coal gasification systems. Annual progress report, 1 November 1979-30 June 1980, report, July 27, 1980; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc1057541/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.