上部冷却による矩形水槽内での飽和多孔質体の凝固・融解特性 : 周期的温度変動に対する飽和多孔質体の固液界面位置の応答(熱工学,内燃機関,動力など)

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This paper describes a response of solid-liquid interface in a water-saturated porous medium to the time-varying cooling temperature. Spherical soda glass beads with an average diameter 5 mm constituted the porous medium. A lower boundary is kept at 8℃ at all time during experiments. First, the upper plate was set at an optional temperature lower than the solidifying point, and then growth of solidified layer was measured. The cooling temperature was then varied periodically with a fixed amplitude of 4℃. The solid-liquid interface position has a characteristic amplitude and phase delay to the upper plate cooling temperature. It is found that the amplitude of interface position is proportional to a period of the cooling temperature variation. The thicker solid layer causes the bigger phase delay in the interface movement. The proposed one-dimensional model is found appropreate to characterize the response of solid-liquid interface.
一般社団法人日本機械学会の論文
2003-06-25