TITLE

Numerical Analysis on Heat Transfer from a Flat Plate at One End of a Rectangular Duct with an Orifice Filled with Pressurized He II

AUTHOR(S)
Fujita, K.; Tatsumoto, H.; Shirai, Y.; Shiotsu, M.
PUB. DATE
June 2004
SOURCE
AIP Conference Proceedings;2004, Vol. 710 Issue 1, p1015
SOURCE TYPE
Conference Proceeding
DOC. TYPE
Article
ABSTRACT
Numerical analysis was performed on steady-state and transient heat transfer from a flat plate located at one-end of a rectangular duct with an orifice in pressurized He II for liquid temperatures from 1.8 to 2.1 K to clarify the effect of heat flow contraction and expansion. The model duct has a dimension of 10×40×100 mm3 and has an orifice at the center of the duct. The flat plate heater is 10 mm wide and 40 mm long. Two-dimensional computer code named SUPER-2D based on the two-fluid model and the theory of mutual friction was used. Steady-state CHF and the time lag from the application of a step heat input to the occurrence of λ transition, that is called a lifetime, were obtained for various values of step heat flux, for the ratio of the cross-sectional area of the orifice to that of the duct from 9.0 % to 100 %. The effects of orifice were clearly observed. The solutions were compared with the experimental data for the ducts with the same sized orifices and the corresponding conditions. They agreed well with the experimental data. The heat transport mechanism in the duct with an orifice was clarified by the analysis. © 2004 American Institute of Physics
ACCESSION #
13868964

 

Related Articles

  • Numerical Study on Characteristics of a Pre-Cooling He II Heat Exchanger. Ueno, Y.; Okamura, T.; Sato, A. // AIP Conference Proceedings;2004, Vol. 710 Issue 1, p1039 

    A numerical analysis has been performed in order to investigate the heat transfer and pressure drop characteristics of a pre-cooling He II heat exchanger. The heat conduction in the pre-cooled helium path in the flow direction was taken into account. Temperature distribution and pressure drop in...

  • Ceramic Current Lead Protects Liquid Helium. Boggs, Robert N. // Design News;12/16/91, Vol. 47 Issue 24, p91 

    Focuses on a ceramic current lead which reduces helium boil-off from cryogenic systems. Improvements to the lead's design; Heat transfer; Superconducting section; Temperatures at the copper section; Test setup for superconducting lead.

  • Critical Heat Flux on a Flat Plate Located at the Middle of a Duct in Forced Flow of Pressurized He II. Okamura, T.; Saeki, M.; Hata, K.; Kama, K.; Shirai, Y.; Shiotsu, M. // AIP Conference Proceedings;2004, Vol. 710 Issue 1, p1023 

    Critical heat fluxes (CHFs) were measured on two horizontal flat plate heaters 6 mm wide and 20 mm long located on inner upper and lower walls of a rectangular duct at 50 mm from the inlet. The duct has 3 mm × 20 mm inner cross sectional area and 100 mm length. The flat plate heaters are...

  • CROSS CHECKING OF GANDALF AND VINCENTA ON THE CS BEHAVIOUR DURING ITER REFERENCE SCENARIO. Nicollet, S.; Bessette, D.; Ciazynski, D.; Duchateau, J. L.; Lacroix, B. // AIP Conference Proceedings;4/9/2010, Vol. 1218 Issue 1, p1402 

    During the plasma reference scenario of ITER, the Central Solenoid (CS) coils are submitted to pulsed heat loads due to pulse operating currents. All Cable-In-Conduit-Conductors (CICC) of these magnets are cooled with a forced flow of supercritical helium. Thermohydraulic calculations aim to...

  • Characterization of a Co-axial Pulse Tube Cryocooler Applied as a Current Lead. Maekawa, R.; Matsubara, Y.; Kato, A.; Takami, S.; Konno, M.; Tomioka, A.; Hayashi, H.; Mito, T. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p1711 

    A co-axial type pulse tube cryocooler has been fabricated which is applied as a current lead for the superconducting coil. The cryocooler consists of an outer regenerator tube enclosing and thermally insulating a central pulse tube. The connection between the pulse tube and the regenerator was...

  • Forced Convection Heat Transfer of He I and He II at Pressures up to Supercritical. Shiotsu, M.; Okamura, T.; Shirai, Y.; Hata, K.; Hama, K. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p459 

    The forced convection heat transfer coefficients were measured on a horizontal flat plate heater located on inner wall of a rectangular duct for pressures from 1 atm to 2.8 atm, flow velocities up to 2.1 m/s and for liquid temperatures from 1.8 to 6.5 K. Critical heat fluxes (CHFs) in He II...

  • Heat Transfer through Porous Media in Static Superfluid Helium. Baudouy, B.; Juster, F.-P.; Allain, H.; Prouzet, E.; Larbot, A.; Maekawa, R. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p409 

    Heat transfer through porous media in static saturated superfluid helium is investigated for porous media with different thickness, porosity and pore size. For large pore diameter, data are analyzed with the tortuosity concept in the pure Gorter-Mellink regime. It is shown that the tortuosity is...

  • Heat Transfer Coefficient Measurement Study of Several Film Boiling Modes in Subcooled He II. Takada, S.; Murakami, M.; Nozawa, M.; Kimura, N. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p401 

    This study was carried out for more detailed information about film boiling heat transfer in subcooled superfluid helium (He II). A number of film boiling modes were experimentally investigated in a wide range of the pressure from the atmospheric pressure down to the saturated vapor pressure. A...

  • Distinctive Features of Construction of Large Cryogenic Systems. Filin, N. V.; Filina, N. N. // Chemical & Petroleum Engineering;Jan/Feb2003, Vol. 39 Issue 1/2, p31 

    Describes the construction of large cryogenic systems. Analysis of various alternatives of design solutions and regulation of the streams; Physical picture of the key processes; Relationships of the processes of storing and transportation of the cryoproducts; Physicomathematical modeling;...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics