1987 Fiscal Year Final Research Report Summary
STUDY ON REMOTE MEASUREMENT OF LOCAL HEAT FLUX
| Project/Area Number |
61460108
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
FUJII TETSU INSTITUTE OF ADVANCED MATERIAL STUDY, 機能物質科学研究所, 教授 (20038574)
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| 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)
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| Project Period (FY) |
1986 – 1987
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| Keywords | REMOTE MEASURING METHOD / CONVECTION HEAT TRANSFER / LOCAL HEAT TRANSFER COEFFICIENT / LOCAL HEAT FLUX / 局所熱流束 / 光ファイバー |
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| 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.
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Research Products
(4 results)
