日本機械学会論文集B編
Online ISSN : 1884-8346
技術論文
湿潤材料の温度測定による高温用広域湿度センサの開発(多孔質セラミックスの感湿部材料への適用)
井上 保伊與田 浩志一色 翔悟
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78 巻 (2012) 792 号 p. 1451-1461

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We applied the theory of a psychrometer to develop a humidity monitoring system by using cylindrical porous ceramic as a sensing element. This system contains a section for supplying/discharging water. Several types of porous ceramics were made and the effects of porosities and pore size distributions on capillary water transfer were investigated. Also, we tested the performance of this system in terms of its response time and measurement accuracy. The capillary water transfer was higher in the conditions that porosity was larger and pore size distribution was wider. In addition, at a gas flow rate of 1 m/s and a gas temperature less than 310 °C, the error of the steam mole fraction was observed to be less than 10 %. Further, the system had a 90 % response time of less than 60 s and this time was shorter as humidity increased at a gas temperature of 200 °C, a gas flow of 1 m/s, a flow rate of supplied water of 0.01 g/s and a water temperature of 25 °C when a sensing element diameter was 9 mm.

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© 2012 一般社団法人 日本機械学会
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