導電性薄膜を伝熱面とした対流熱伝達測定の周波数応答および空間分解能(熱工学,内燃機関,動力など)

概要

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A technique for measurements of time-space distribution of convective heat transfer has been developed using a test surface fabricated from a thin conductive film heated electrically. The fluctuating temperature on the test surface can be measured using infrared thermograph having high frame-rate, if the heat capacity of the test surface is sufficiently low. In this work, the frequency-response of the heat transfer from the test surface was investigated by solving the heat conduction equations by considering the heat losses. Also, the spatial resolution due to the lateral conduction through the test surface was investigated. The upper limit of the fluctuating frequency and the lower limit of the spatial wavelength, which is detectable using infrared thermography, are found to be uniquely decided for each test surface as a function of (T^^-_w - T_0) Δh/ΔT_<IR0>, where (T^^-_w - T_0) is the mean temperature difference between the wall and freestream, Δh is time or spatial amplitude of the heat transfer coefficient, and ΔT_<IR0> is a temperature difference equivalent to noise of infrared measurements for the black body.
社団法人日本機械学会の論文
2007-02-25