Convective heat transfer and flow stability in rotating disk CVD reactors

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The flow and heat transfer of NH{sub 3} and He have been studied in a rotating disk system with applications to chemical vapor deposition reactors. Influence of the important operating parameters were studied numerically over ranges of the primary dimensionless variables: (1) the spin Reynolds number, Re{sub {omega}}, (2) the disk mixed convection parameter, MCP{sub d}, and (3) a new parameter, the wall mixed convection parameter, MCP{sub w}. Inlet velocities were set to the corresponding infinite rotating disk asymptotic velocity. Results were obtained primarily for NH{sub 3}. Results show that increasing Re{sub {omega}} from 314.5 to 3,145 increases the uniformity ... continued below

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8 p.

Creation Information

Winters, W. S.; Evans, G. H. & Greif, R. August 1998.

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  • Winters, W. S.
  • Evans, G. H. Sandia National Labs., Livermore, CA (United States). Computational Reactive Processes Dept.
  • Greif, R. Univ. of California, Berkeley, CA (United States). Mechanical Engineering Dept.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, NM (United States)
    Place of Publication: Livermore, California

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Description

The flow and heat transfer of NH{sub 3} and He have been studied in a rotating disk system with applications to chemical vapor deposition reactors. Influence of the important operating parameters were studied numerically over ranges of the primary dimensionless variables: (1) the spin Reynolds number, Re{sub {omega}}, (2) the disk mixed convection parameter, MCP{sub d}, and (3) a new parameter, the wall mixed convection parameter, MCP{sub w}. Inlet velocities were set to the corresponding infinite rotating disk asymptotic velocity. Results were obtained primarily for NH{sub 3}. Results show that increasing Re{sub {omega}} from 314.5 to 3,145 increases the uniformity of the rotating disk heat flux and results in thinner thermal boundary layers at the disk surface. At Re{sub {omega}} = 314.5, increasing MCP{sub d} to 15 leads to significant departure from the infinite disk result with nonuniform disk heat fluxes and recirculating flow patterns. At Re{sub {omega}} = 3,145, the results are closer to the infinite disk for MCP{sub d} up to 15. For large values of MCP{sub w}, the flow recirculates and there is significant deviation from the infinite disk result. The influence of MCP{sub w} on flow stability is increased at larger MCP{sub d} and lower Re{sub {omega}}. The results show that because of variable transport properties, the flow of NH{sub 3} is less stable than that of He as MCP{sub d} is increased for MCP{sub w} = 0 and Re{sub {omega}} = 314.5.

Physical Description

8 p.

Notes

OSTI as DE98052543

Source

  • 11. international heat transfer conference, Seoul (Korea, Republic of), 23-28 Aug 1998

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  • Other: DE98052543
  • Report No.: SAND--98-8482C
  • Report No.: CONF-980806--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/658151 | External Link
  • Office of Scientific & Technical Information Report Number: 658151
  • Archival Resource Key: ark:/67531/metadc711029

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

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Creation Date

  • August 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • April 11, 2016, 12:54 p.m.

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Winters, W. S.; Evans, G. H. & Greif, R. Convective heat transfer and flow stability in rotating disk CVD reactors, report, August 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc711029/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.