G0600-1-2 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 : 感湿部表面の水分保持性能の向上(熱工学部門一般講演(1):伝熱(1))

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  • G0600-1-2 Development of high-temperature wide-range humidity sensor by wetted material temperature measurement : Enhancement of moisture retention capability at the material surface

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We have developed a humidity sensor by applying the principle of the Assman psychrometer. Cylindrical porous ceramic material was used in this sensor for sensing humidity. Some water flowing in the center of the sensing element is supplied to the surface by means of capillary flow, and the temperature of the wetted surface is used as a wet-bulb temperature. In this study, the relationship between the water evaporation rate and the surface temperature of the humidity sensing element were experimentally and theoretically investigated under various gas temperature (100-300℃) and flow velocity (1-10 m/s) conditions. Three types of porous materials with different pore size distributions were used as the sensing element. The difference between the surface temperature and the calculated value of wet-bulb temperature was observed to be large when the evaporation rate was high and the porosity and the median diameter of the sensing element was low.

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