Distributed measurements of tracer response on packed bed flows using a fiberoptic probe array. Final report Metadata

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Title

  • Main Title Distributed measurements of tracer response on packed bed flows using a fiberoptic probe array. Final report

Creator

  • Author: Jones, M. C.
    Creator Type: Personal
  • Author: Nassimbene, R.
    Creator Type: Personal
  • Author: Wolfe, J.
    Creator Type: Personal
    Creator Info: National Inst. of Standards and Technology, Boulder, CO (United States). Chemical Science and Technology Lab.
  • Author: Frederick, N.
    Creator Type: Personal
    Creator Info: Rocky Mountain Electron Video, Boulder, CO (United States)

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: National Inst. of Standards and Technology, Boulder, CO (United States). Chemical Sciences and Technology Lab.
    Place of Publication: United States

Date

  • Creation: 1994-10-28

Language

  • English

Description

  • Content Description: Scale-up of packed bed processes, particularly those involving chromatographic separations, is made difficult by a seemingly inevitable increase in dispersion due to packing nonuniformity. To provide a suitable characterization, the authors measured the spatial distribution of dispersion and mixing in packed beds of uniform impervious spherical glass particles by a tracer impulse technique. The key feature in this work is the use of a fiberoptic array at the exit plane to obtain a time-resolved spatially distributed response. All experiments were in the creeping flow regime. The authors used a fluorescent dye with laser excitation through the fiber terminations in the bed. The fluoresced radiation was collected through the same fibers. They analyzed the data by the use of indices of the extent of micromixing based on Danckwerts`s original degree of segregation and an additional index of structural uniformity. The computations involve a moment analysis of the individual and average probe responses. A simple model gives expressions for the indices in terms of the Peclet number and is shown to provide a useful limiting case. The computed indices are also shown to be very sensitive to adsorption of dye on the surface of the glass. However, for some of the experiments with the largest spheres using Pyrex glass, the effects of adsorption are indiscernible. This technique successfully separates the contribution of micromixed fluid to overall bed dispersion from the contribution due to the transverse variation of the flow residence time.
  • Physical Description: 28 p.

Subject

  • Keyword: Chromatography
  • Keyword: Fluorescence
  • Keyword: Tracer Techniques
  • Keyword: Fluid Flow
  • Keyword: Progress Report
  • Keyword: Fiber Optics
  • Keyword: Packed Beds
  • Keyword: Experimental Data
  • Keyword: Flow Visualization
  • Keyword: Dyes
  • Keyword: Extraction Columns
  • STI Subject Categories: 40 Chemistry
  • Keyword: Flow Models
  • Keyword: Mass Transfer

Source

  • Other Information: PBD: 28 Oct 1994

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE95013079
  • Report No.: DOE/ER/13770--T3
  • Grant Number: AI05-87ER13770
  • DOI: 10.2172/72901
  • Office of Scientific & Technical Information Report Number: 72901
  • Archival Resource Key: ark:/67531/metadc711573

Note

  • Display Note: OSTI as DE95013079
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