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STUDY ON REMOTE MEASUREMENT OF LOCAL HEAT FLUX

Research Project

Project/Area Number 61460108
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

FUJII TETSU  INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 教授 (20038574)

Co-Investigator(Kenkyū-buntansha) SHINZATO KAN-EI  INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 助手 (30101463)
TAKAMATSU HIROSHI  INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 助手 (20179550)
KOYAMA SHIGERU  INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 助教授 (00153693)
FUJII MOTOO  INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 助教授 (90038589)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1987: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsREMOTE MEASURING METHOD / CONVECTION HEAT TRANSFER / LOCAL HEAT TRANSFER COEFFICIENT / LOCAL HEAT FLUX / 局所熱流束 / 光ファイバー / 遠隔測定法 / 対流熱伝達係数 / レーザ加熱 / 赤外線温度計
Research Abstract

The present investigation concerns with a remote method of measuring local heat flux of a heat transfer wall. The method is based on the fact that when the wall is heated locally, the temperature increment at that point depends on the local heat transfer coefficient. The degree of the dependency is, therefore, regarded as the sensitivity of the method. When a power laser and an infrared spot thermometer are used to provide local heat and measure the temperature increment, respectively, the sensitivity and accuracy of the method are investigated both theoretically and experimentally for a simple convection heat transfer system. Further is discussed its applicability to more practical and complicated systems.
The main results of the present study are as follows:
1) The sensitivity varies with thermophysical properties of the heat transfer wall. It is relatively high for plastics which have low thermal diffusivity but is very low for metals.
2) The integral of the temperature increment curve is the quantity most sensitive to variation in heat transfer coefficient. If the accuracy of the integrated value is within 2 %, the heat transfer coefficient could be evaluated within 10% for acryl. For metals, however, the error is above 80 %.
3) Automatical measurement of laser heat and temperature increment with the aid of a personal computer made it possible to evaluate forced convection heat transfer coefficient of a flat plaster plate within 20 % error margin.
4) The present method differs from the conventional methods in such a way that it needs no sensor attachment to the heat transfer wall. This method would become simple and practical in roughly evaluating the local heat transfer coefficient and/or heat flux of heat transfer walls, if the accuracy of the infrared spot thermometer is improved and use of a coaxial optical fiber to power laser and infrared thermometer becomes possible.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report

Research Products

(4 results)

All Other

All Publications (4 results)

  • [Publications] 藤井丕夫, 藤井哲, N. MUGABI, 吉川朝郁: 九州大学機能物質科学研究所報告. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 藤井丕夫, 藤井哲, N. MUGABI, 吉川朝郁: 第25回日本伝熱シンポジウム講演論文集. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] MOTOO FUJII, NELSON MUGABI, CHOUIKU YOSHIKAWA, TETSU FUJII: "A METHOD FOR REMOTE MEASURING OF LOCAL HEAT TRANSFER COEFFICIENT" REPORT OF INSTITUTE OF ADVANCED MATERIAL STUDY, KYUSHU UNIVERSITY. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] TETSU FUJII, MOTOO FUJII, NELSON MUGABI, CHOUIKU YOSHIKAWA: "REMOTE MEASURING OF LOCAL HEAT TRANSFER COEFFICIENT" PROCEEDINGS OF 25th NATIONAL HEAT TRANSFER SYMPOSIUM OF JAPAN. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary

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Published: 1987-03-30   Modified: 2016-04-21  

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