Physical interpretation of geysering phenomena and periodic boiling instability at low flows

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Over 30 years ago, Griffith showed that unstable and periodic initial boiling occurred in stagnant liquids in heated pipes coupled to a cooler or condensing plenum volume. This was called ``geysering``, and is a similar phenomenon to the rapid nucleation and voiding observed in tubes filled with superheated liquid. It is also called ``bumping`` when non-uniformly heated water or a chemical suddenly boils in laboratory glassware. In engineering, the stability and predictability has importance to the onset of bulk boiling in a natural and forced circulation loops. The latest available data show the observed stability and periodicity of the onset ... continued below

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10 p.

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Duffey, R. B. & Rohatgi, U. S. March 1996.

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Description

Over 30 years ago, Griffith showed that unstable and periodic initial boiling occurred in stagnant liquids in heated pipes coupled to a cooler or condensing plenum volume. This was called ``geysering``, and is a similar phenomenon to the rapid nucleation and voiding observed in tubes filled with superheated liquid. It is also called ``bumping`` when non-uniformly heated water or a chemical suddenly boils in laboratory glassware. In engineering, the stability and predictability has importance to the onset of bulk boiling in a natural and forced circulation loops. The latest available data show the observed stability and periodicity of the onset of boiling flow when there is a plenum, multiple heated channels, and a sustained subcooling in a circulating loop. We examine the available data, both old and new, and develop a new theory to illustrate the simple physics causing the observed periodicity of the flow. We examine the validity of the theory by comparison to all the geysering data, and develop a useful and simple correlation. We illustrate the equivalence of the onset of geysering to the onset of static instability in subcooled boiling. We also derive the stability boundary for geysering, utilizing turbulent transport analysis to determine the effects of pressure and other key parameters. This new result explains the greater stability region observed at higher pressures. The paper builds on the 30 years of quite independent thermal hydraulic work that is still fresh and useful today. We discuss the physical interpretation of geysering onset with a consistent theory, and show where refinements would be useful to the data correlations.

Physical Description

10 p.

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INIS; OSTI as DE96007744

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  • ICONE 4: ASME/JSME international conference on nuclear engineering, New Orleans, LA (United States), 10-13 Mar 1996

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  • Other: DE96007744
  • Report No.: BNL--62703
  • Report No.: CONF-960306--11
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 230544
  • Archival Resource Key: ark:/67531/metadc665475

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  • March 1996

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 9, 2015, 8:39 p.m.

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Duffey, R. B. & Rohatgi, U. S. Physical interpretation of geysering phenomena and periodic boiling instability at low flows, article, March 1996; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc665475/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.