2139 高温高湿度乾燥における乾燥時間の予測に関する研究(G06-6 熱工学(6) 伝熱(4),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

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The effect of dry- and wet-bulb temperatures on the drying time of a wet spherical porous material in high-temperature gas flow was investigated. The changes in the mass and surface and core temperatures of the material during drying were measured using a test apparatus, in which the dry- and wet-bulb temperatures could be controlled in the range of 120-280 and 40-100 ℃, respectively. A wet spherical brick was used as the sample porous material. The experimental results showed that the mean moisture content at the end of surface evaporation period (the critical moisture content) was low under high wet-bulb temperatures. Further, the standardized drying characteristics curves for falling drying rate periods were in good agreement with each other under all experimental conditions. In addition, the time required to reduce the moisture content below the critical moisture content was almost the same under all wet-bulb conditions at the same constant drying rate, regardless of steam condensation.
2008-08-02