Instrumentation development for multi-dimensional two-phase flow modeling

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A multi-faceted instrumentation approach is described which has played a significant role in obtaining fundamental data for two-phase flow model development. This experimental work supports the development of a three-dimensional, two-fluid, four field computational analysis capability. The goal of this development is to utilize mechanistic models and fundamental understanding rather than rely on empirical correlations to describe the interactions in two-phase flows. The four fields (two dispersed and two continuous) provide a means for predicting the flow topology and the local variables over the full range of flow regimes. The fidelity of the model development can be verified by comparisons ... continued below

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35 p.

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Kirouac, G.J.; Trabold, T.A.; Vassallo, P.F.; Moore, W.E. & Kumar, R. June 1, 1999.

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  • Knolls Atomic Power Laboratory
    Publisher Info: Knolls Atomic Power Lab., Schenectady, NY (United States)
    Place of Publication: Schenectady, New York

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Description

A multi-faceted instrumentation approach is described which has played a significant role in obtaining fundamental data for two-phase flow model development. This experimental work supports the development of a three-dimensional, two-fluid, four field computational analysis capability. The goal of this development is to utilize mechanistic models and fundamental understanding rather than rely on empirical correlations to describe the interactions in two-phase flows. The four fields (two dispersed and two continuous) provide a means for predicting the flow topology and the local variables over the full range of flow regimes. The fidelity of the model development can be verified by comparisons of the three-dimensional predictions with local measurements of the flow variables. Both invasive and non-invasive instrumentation techniques and their strengths and limitations are discussed. A critical aspect of this instrumentation development has been the use of a low pressure/temperature modeling fluid (R-134a) in a vertical duct which permits full optical access to visualize the flow fields in all two-phase flow regimes. The modeling fluid accurately simulates boiling steam-water systems. Particular attention is focused on the use of a gamma densitometer to obtain line-averaged and cross-sectional averaged void fractions. Hot-film anemometer probes provide data on local void fraction, interfacial frequency, bubble and droplet size, as well as information on the behavior of the liquid-vapor interface in annular flows. A laser Doppler velocimeter is used to measure the velocity of liquid-vapor interfaces in bubbly, slug and annular flows. Flow visualization techniques are also used to obtain a qualitative understanding of the two-phase flow structure, and to obtain supporting quantitative data on bubble size. Examples of data obtained with these various measurement methods are shown.

Physical Description

35 p.

Notes

OSTI as DE99002833

Source

  • ASME Fluids Engineering Division summer meeting, San Francisco, CA (United States), 18-23 Jul 1999

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  • Other: DE99002833
  • Report No.: KAPL-P--000099
  • Report No.: K--98112;CONF-990702--
  • Grant Number: AC12-76SN00052
  • DOI: 10.2172/353194 | External Link
  • Office of Scientific & Technical Information Report Number: 353194
  • Archival Resource Key: ark:/67531/metadc675502

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Creation Date

  • June 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 16, 2016, 3:56 p.m.

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Kirouac, G.J.; Trabold, T.A.; Vassallo, P.F.; Moore, W.E. & Kumar, R. Instrumentation development for multi-dimensional two-phase flow modeling, report, June 1, 1999; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc675502/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.