Correlation of spherical thermistor for the measurement of low velocity air flow |
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Authors: | Xin-Gang Liang Hong Liang Jian-Xun Ren Wei-Lin Hu Ying-Ping Zhang |
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Affiliation: | (1) Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China;(2) Department of Thermal Engineering, Tsinghua University, 100084 Beijing, China |
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Abstract: | A spherical thermistor, an accurate temperature sensor, is employed as an air velocity sensor in this work. The measuring
principle is derived and the effects of the insulation layer, air temperature, natural convection and thermal radiation are
discussed. Two different correlation relations for velocity measurements are proposed based on theoretical analyses and experimental
calibrations. Experiments have shown that spherical thermistor is a good velocity sensor for speed between 0.1–2.5 m/s at
room temperature and the insulation layer hardly influences the accuracy of the thermistor used in the present work. Modification
on correlation can even further improve measurement accuracy. Since the thermistor is small and cheap, it is possible to apply
this method to multi-point velocity measurement with a low disturbance to the flow field. |
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Keywords: | air velocity measurement thermoglobe thermistor |
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