| Project/Area Number |
07650242
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
SATOH Isao Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10170721)
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| Co-Investigator(Kenkyū-buntansha) |
FUSHINOBU Kazuyoshi Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (50280996)
山田 純 東京工業大学, 工学部, 助手 (40210455)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Temperature / Velocity Measurement / Simultaneous Measurement / LDV / Fluorescent Seed Particles / Lifetime of Fluorescence / Monochromator / Phase Shift / Smoothing Effect / 強度変調 / 固気二相流 / 粒子温度 |
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| Research Abstract |
In order to examine the mechanism of heat transfer in heterogeneous heat transfer media, e.g.gas-solid two-phase flow, from microscopic view point, it is keenly required to develop the technique for simultaneous measurement of temperature and velocity of the media in local basis. In this research project, the concept of a temperature/velocity measurement technique utilizing Laser-Doppler Velocimetory (LDV) with fluorescent seed particles was proposed, and its feasibility was experimentally examined. To examine the feasibility of the technique, an optical setup of LDV was constructed by using an Ar^+ ion laser (visible light) or a He-Cd gas laser (UV light), and the fluorescent seed particles dispersed in the heat transfer medium enable us to measure the fluorescent light, from which the temperature of medium was evaluated, as well as the scattered light for the velocity measurement. Obtained results can be summarized as follows :
1. In the simultaneous measurement for the temperature and velocity of the same seed particle, fluorescent light and scattered light can be effectively separated by using a monochromator. The measurement of fluorescent light through the monochromator would improve the accuracy of temperature measurement, since the lifetime of fluorescence depends upon the wavelength of the fluorescent light.
2. The fluorescent particles developed for the fluorescent lamps and/or CRT display are suitable as the seed particles, since the particles emit relatively strong fluorescent light in visible wavelength range. However the decay of fluorescence of these particles after the excitation is quite slower than the rising, and thus the temperature dependence of fluorescent lifetime of these particles can be observed not as the phase shift but as the change of smoothing effect on the Doppler burst signal.
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