Entrainment rate of droplets in the ripple-annular regime for small vertical tubes

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Description

Two-fluid model predictions of film dryout in annular flow are limited by the uncertainties in the constitutive relations for the entrainment rate of droplets from the liquid film. The main cause of these uncertainties is the lack of separate effects experimental data in the range of the operating conditions in nuclear power reactors. Air/water and Freon-113 entrainment rate data have been obtained in 10 mm tubes using the film extraction technique. These experiments have been scaled to approach high pressure steam-water flow conditions. The effects of surface tension and density ratio, missing from most previous data sets, have been systematically ... continued below

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28 p.

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Lopez de Bertodano, M.A.; Assad, A. & Beus, S.G. June 1, 1998.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 17 times . More information about this article can be viewed below.

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Authors

  • Lopez de Bertodano, M.A.
  • Assad, A. Purdue Univ., West Lafayette, IN (United States). School of Nuclear Engineering
  • Beus, S.G. Westinghouse Electric Corp., West Mifflin, PA (United States). Bettis Atomic Power Lab.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

Two-fluid model predictions of film dryout in annular flow are limited by the uncertainties in the constitutive relations for the entrainment rate of droplets from the liquid film. The main cause of these uncertainties is the lack of separate effects experimental data in the range of the operating conditions in nuclear power reactors. Air/water and Freon-113 entrainment rate data have been obtained in 10 mm tubes using the film extraction technique. These experiments have been scaled to approach high pressure steam-water flow conditions. The effects of surface tension and density ratio, missing from most previous data sets, have been systematically tested. The entrainment rate mechanism is assumed to be a Kelvin-Helmholtz instability. Based on this analysis and two previous correlations, a new correlation is proposed that is valid for low viscosity fluids in small ducts in the ripple annular regime.

Physical Description

28 p.

Notes

INIS; OSTI as DE98004678

Source

  • International conference on multi-phase flow, Lyon (France), Jun 1998

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  • Other: DE98004678
  • Report No.: WAPD-T--3166
  • Report No.: CONF-980643--
  • Grant Number: AC11-93PN38195
  • Office of Scientific & Technical Information Report Number: 654146
  • Archival Resource Key: ark:/67531/metadc706213

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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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Creation Date

  • June 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • May 5, 2016, 6:25 p.m.

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Lopez de Bertodano, M.A.; Assad, A. & Beus, S.G. Entrainment rate of droplets in the ripple-annular regime for small vertical tubes, article, June 1, 1998; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc706213/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.