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1990 Fiscal Year Final Research Report Summary

A Study on Flow in a Rod Bundle Influenced Strongly by Buoyant Force

Research Project

Project/Area Number 01580229
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionKobe University

Principal Investigator

NAKAJIMA Tsuyoshi  Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (30031090)

Project Period (FY) 1989 – 1990
KeywordsRod bundles / Turbulent heat flux between subchannels / Thermal plume / LDV / Laser induced fluorescence / 04Simultaneous measurement of velocity and temperature
Research Abstract

The experimental study of the thermal plumes in a rod bundle has been performed to measure the turbulent heat flux between subchannels and to provide information on the thermal plume behavior at the gap. An Ar-ion laser was used to measure velocity and temperature simultaneously without disturbing the flow field. A fiber LDV was made and inserted into a glass pipe with a Nichrome film heater on its outer surface, through which the laser beam was introduce into the fluid. The velocity information was obtained from the light scattered from SiC scattering particles and the temperature was estimated from the change of fluorescence of Rhodamine B solution. The turbulent heat flux at the gap center was measured under the conditions of Re=50-400 and Gr_<DELTAT>=300-1300 for various power skews. The experimental results show that the turbulent heat flux obtained experimentally was for smaller than the predicted values. Therefore, for application to the sodium cooled reactors it was expected that the turbulent heat flux might be negligibly small. The turbulent heat flux increased with Re and Gr_<DELTAT>. Negative turbulent heat flux, that is, counterflux heat transfer was observed. The change of temperature and velocity with time showed that the phase difference between velocity and temperature brought the counterflux. The phase difference is considered to be a reason for smaller turbulent heat flux than the predicted values. The simultaneous measurement system for velocity and temperature used in the present study operated quite well and is expected to display its ability not only in rod bundles but also in general thermal fluid study.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Yuji IKEDA(池田,裕二): "A compact fibre LDV with a perforated beam expander" Meas.Sci.Technol.1. 260-264 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中島,健: "ファイバ-LDVを用いた水の速度と温度の同時測定" 日本機械学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuyoshi NAKAJIMA(中島 健): "Simultaneous measurement of velocity and temperature of water flowing in rod bundles" Int.J.Heat Mass Transfer.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuyshi NAKAJIMA(中島 健): "Application of Laser Techniques in Fluid Mechnicsの中の論文として "Simultaneous measurement of velocity and temperature of water using LDV and fluorescence technique"" SpringerーVerlag, (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuji IKEDA: "A compact fiber LDV with a perforated beam expander" Meas. Sci. Technol.Vol. 1. 260-264 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuyoshi NAKAJIMA: "Simultaneous measurement of velocity and temperature of water using a fibre LDV" Bulletin of JSME.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuyoshi NAKAJIMA: "Simultaneous measurement of velocity and temperature of water flowing in rod bundles" Int. J. Heat Mass Transfer.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuyoshi NAKAJIMA: "Application of Laser Techniques in Fluid Mechanics "Simultaneous measurement of velocity and temperature of water using LDV and fluorescence technique"" Springer-Verlag.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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