Critical boiling, vapor block, and prospects for single-sweep training of superconducting solenoids

PDF Version Also Available for Download.

Description

Data of seven groups who have measured steady-state critical nucleate boiling heat flux (CHF) from a channel wall to helium flowing at known mass flux G are correlated to +- 13%. None of the plots shows any trend in CHF deviation with respect to six relevant experimental variables. To achieve quench control in a partially quenched, multichanneled, straight solenoid, the average mass flux anti G must exceed G to avoid vapor block in the quench-affected channels. Equations derived for anti G/G are based on both laminar- and turbulent-flow models. In a proposed method of quench control, every miniquench, MQ (involving ... continued below

Physical Description

Pages: 30

Creation Information

Sydoriak, S.G. July 1, 1979.

Context

This report 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. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

Data of seven groups who have measured steady-state critical nucleate boiling heat flux (CHF) from a channel wall to helium flowing at known mass flux G are correlated to +- 13%. None of the plots shows any trend in CHF deviation with respect to six relevant experimental variables. To achieve quench control in a partially quenched, multichanneled, straight solenoid, the average mass flux anti G must exceed G to avoid vapor block in the quench-affected channels. Equations derived for anti G/G are based on both laminar- and turbulent-flow models. In a proposed method of quench control, every miniquench, MQ (involving up to one full turn of the conductor), that exists in the absence of another MQ in one or more of its channels is automatically suppressed by maintaining a calculable coolant flow provided by an immersed circulating pump in parallel with the magnet channels. Two MQs that involve the same channel can be eliminated by a rapid doubling of mass flux. On the basis of the observed frequency of such double MQs, the pump rate can be held low enough to reduce nearly to zero the probability that three MQs will involve the same channel simultaneously. Prospects for single-sweep training free of current reversals are enhanced by the fact that in typical forced-flow boiling, as contrasted to typical pure boiling, the first (breakaway) and second (recovery) CHFs are identical. The available transient mass flux at onset of a quench is also superior to that for both pool boiling and natural convection boiling because it exceeds the planned-for steady-state value.

Physical Description

Pages: 30

Notes

Dep. NTIS, PC A03/MF A01.

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: LA-7494
  • Grant Number: W-7405-ENG--36
  • DOI: 10.2172/6387872 | External Link
  • Office of Scientific & Technical Information Report Number: 6387872
  • Archival Resource Key: ark:/67531/metadc1206050

Collections

This report is part of the following collection of related materials.

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.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • July 1, 1979

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

Description Last Updated

  • Aug. 8, 2018, 1:55 p.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Sydoriak, S.G. Critical boiling, vapor block, and prospects for single-sweep training of superconducting solenoids, report, July 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1206050/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.