An investigation into flow regimes for two-phase helium flow

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The Tevatron accelerator at Fermilab incorporates long two-phase helium passages. During magnet design, the generalized flow map of Baker was used to predict homogeneous flow. Longer than expected magnet time constants led to this investigation. The importance of predicting the flow regime has been amplified with the advent of non-horizontal accelerator designs. A test setup was constructed at Fermilab to investigate two-phase helium flow regimes for conditions practical in accelerator designs. The setup consisted of a standard Tevatron satellite refrigerator, subcooling dewar, heater, 35 m long transfer line, and a specialized end box. A knife blade on the midplane of ... continued below

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Pages: 9

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Theilacker, J.C. & Rode, C.H. October 1, 1987.

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Description

The Tevatron accelerator at Fermilab incorporates long two-phase helium passages. During magnet design, the generalized flow map of Baker was used to predict homogeneous flow. Longer than expected magnet time constants led to this investigation. The importance of predicting the flow regime has been amplified with the advent of non-horizontal accelerator designs. A test setup was constructed at Fermilab to investigate two-phase helium flow regimes for conditions practical in accelerator designs. The setup consisted of a standard Tevatron satellite refrigerator, subcooling dewar, heater, 35 m long transfer line, and a specialized end box. A knife blade on the midplane of the transfer line diverted the flow from the upper and lower halves of the pipe to separate vessels in the end box. The amount of liquid above and below the plane was measured at various total mass flow rates and liquid percentages. The results show that stratified flow occurs at much higher liquid percentages than predicted by the Baker diagram (several orders of magnitude). We were not able to produce high enough steady state flows to find a boundary to a homogenous flow regime. Stratified flow occurred over all practical conditions for long accelerator magnet systems.

Physical Description

Pages: 9

Notes

NTIS, PC A02/MF A01; 1.

Source

  • Cryogenic engineering conference, St. Charles, IL, USA, 14 Jun 1987

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  • Other: DE88002834
  • Report No.: FNAL-TM-1482
  • Report No.: CONF-8706125-18
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 5825579
  • Archival Resource Key: ark:/67531/metadc1099200

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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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  • October 1, 1987

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 4, 2018, 12:59 p.m.

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Theilacker, J.C. & Rode, C.H. An investigation into flow regimes for two-phase helium flow, article, October 1, 1987; United States. (digital.library.unt.edu/ark:/67531/metadc1099200/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.