Two-phase flow measurement by pulsed neutron activation techniques

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The Pulsed Neutron Activation (PNA) technique for measuring the mass flow velocity and the average density of two-phase mixtures is described. PNA equipment can be easily installed at different loops, and PNA techniques are non-intrusive and independent of flow regimes. These features of the PNA technique make it suitable for in-situ measurement of two-phase flows, and for calibration of more conventional two-phase flow measurement devices. Analytic relations governing the various PNA methods are derived. The equipment and procedures used in the first air-water flow measurement by PNA techniques are discussed, and recommendations are made for improvement of future tests. In ... continued below

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Pages: 202

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Kehler, P. January 1, 1978.

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Description

The Pulsed Neutron Activation (PNA) technique for measuring the mass flow velocity and the average density of two-phase mixtures is described. PNA equipment can be easily installed at different loops, and PNA techniques are non-intrusive and independent of flow regimes. These features of the PNA technique make it suitable for in-situ measurement of two-phase flows, and for calibration of more conventional two-phase flow measurement devices. Analytic relations governing the various PNA methods are derived. The equipment and procedures used in the first air-water flow measurement by PNA techniques are discussed, and recommendations are made for improvement of future tests. In the present test, the mass flow velocity was determined with an accuracy of 2%, and average densities were measured down to 0.08 g/cm/sup 3/ with an accuracy of 0.04 g/cm/sup 3/. Both the accuracy of the mass flow velocity measurement and the lower limit of the density measurement are functions of the injected activity and of the total number of counts. By using a stronger neutron source and a larger number of detectors, the measurable density can be decreased by a factor of 12 to .007 g/cm/sup 3/ for 12.5 cm pipes, and to even lower ranges for larger pipes.

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Pages: 202

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Dep. NTIS, PC A10/MF A01.

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  • Report No.: ANL-NUREG-CT-79-17
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/5694383 | External Link
  • Office of Scientific & Technical Information Report Number: 5694383
  • Archival Resource Key: ark:/67531/metadc1092559

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1978

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 18, 2018, 5:21 p.m.

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Kehler, P. Two-phase flow measurement by pulsed neutron activation techniques, report, January 1, 1978; Illinois. (digital.library.unt.edu/ark:/67531/metadc1092559/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.