Ash & Pulverized Coal Deposition in Combustors & Gasifiers

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Description

Gravity- driven granular flow of slightly frictional particles down an inclined, bumpy chute is studied. A modified kinetic model which includes the frictional energy loss effects is used, and the boundary conditions for a bumpy wall with small friction are derived by ensuring the balance of momentum and energy. At the free surface, the condition of vanishing of the solid volume fraction is used. The mean velocity, the fluctuation kinetic energy and the solid volume fraction profiles are evaluated. It is shown that steady granular gravity flow down a bumpy frictional chute could be achieved at arbitrary inclination angles. The ... continued below

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Ahamadi, Goodarz December 14, 1998.

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Description

Gravity- driven granular flow of slightly frictional particles down an inclined, bumpy chute is studied. A modified kinetic model which includes the frictional energy loss effects is used, and the boundary conditions for a bumpy wall with small friction are derived by ensuring the balance of momentum and energy. At the free surface, the condition of vanishing of the solid volume fraction is used. The mean velocity, the fluctuation kinetic energy and the solid volume fraction profiles are evaluated. It is shown that steady granular gravity flow down a bumpy frictional chute could be achieved at arbitrary inclination angles. The computational results also show that the slip velocity may vary considerably depending on the granular layer height, the surface boundary roughness, the fric-tion coefficient and the inclination angles. The model predictions are compared with the existing experimental and simulation data, and good agreement is observed. In particular, the model can well predicate the features of the variation of solid volume fraction and fluctuation energy profiles for different particle- wall friction coeffi-cients and wall roughnesses.

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  • Other: DE00002273
  • Report No.: DE-FG22-94PC94213--11
  • Grant Number: FG22-94PC94213
  • DOI: 10.2172/2273 | External Link
  • Office of Scientific & Technical Information Report Number: 2273
  • Archival Resource Key: ark:/67531/metadc667914

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 14, 1998

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Dec. 8, 2016, 2:24 p.m.

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Ahamadi, Goodarz. Ash & Pulverized Coal Deposition in Combustors & Gasifiers, report, December 14, 1998; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc667914/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.