1ω・3ω計測による流体の温度・熱物性値計測 : 第1報,実験的研究

概要

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A method of measuring temperature and thermal properties of nonconductive fluids was experimentally studied, where 1ω and 3ω components of the voltage drop across a thin metal wire probe heated with an AC current of frequency ω were measured. The temperature distribution of a weak natural convection plume from a horizontal wire in water was visualized by this method and it was shown that background noise and self-heating of the probe limit the measurement resolution. Thermal conductivity measurements were performed for air, water, ethanol, etc. using a 10μm-diameter platinum wire, with applied AC frequency ranging from 0.1 Hz-10 kHz. Since thermal conductivity is derived from the measured 3ω component by comparing with a thermal conduction model, the effect of natural convection from the probe itself was important and a restriction on applicability of the method was obtained in terms of the Rayleigh and Fourier numbers.
一般社団法人日本機械学会の論文
1996-07-25