On the role of mass diffusion and fluid dynamics in the dissipation of chunk mix

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When numerically simulating multicomponent turbulent flows, subgrid-scale diffusion of chemical species requires closure. This mixing of chemical species at the molecular level dissipates concentration uctuations, which limits possible demixing and affects other pro- cesses such as energy transport and reaction rates at the subgrid level. We discuss some of the physical processes that reduce small chunks of a heavy material in a light gas or plasma to a mixture at the atomic level. Preliminary direct numerical simulations of these processes are presented using the dissipation of small spheres of heavy gas in a light gas as an archetypal process in ... continued below

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925 Kilobytes

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Cloutman, L D March 1, 1999.

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When numerically simulating multicomponent turbulent flows, subgrid-scale diffusion of chemical species requires closure. This mixing of chemical species at the molecular level dissipates concentration uctuations, which limits possible demixing and affects other pro- cesses such as energy transport and reaction rates at the subgrid level. We discuss some of the physical processes that reduce small chunks of a heavy material in a light gas or plasma to a mixture at the atomic level. Preliminary direct numerical simulations of these processes are presented using the dissipation of small spheres of heavy gas in a light gas as an archetypal process in turbulent micromixing in multicomponent ows, including classical uid instabilities and shock ejecta. We use a detailed approach for the diffusion process, directly solving the Stefan-Maxwell equations for the mass fluxes. We discuss the dissipa- tion of a 24µm sphere of xenon in helium in three different flow regimes, and we present suggestions for future work intended as input to improved subgrid-scale turbulence models.

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925 Kilobytes

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  • Other: DE00008402
  • Report No.: UCRL-ID-133412
  • Grant Number: W-7405-Eng-48
  • DOI: 10.2172/8402 | External Link
  • Office of Scientific & Technical Information Report Number: 8402
  • Archival Resource Key: ark:/67531/metadc780825

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  • March 1, 1999

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • May 6, 2016, 10:57 p.m.

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Cloutman, L D. On the role of mass diffusion and fluid dynamics in the dissipation of chunk mix, report, March 1, 1999; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc780825/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.