上方冷却による水槽内での氷の凝固・融解特性 : 周期的冷却温度変化に対する氷厚さの応答(熱工学, 内燃機関, 動力など)

抄録

This paper describes a response of ice-layer formation to the time-varying cooling temperature at the top of the water-filled rectangular vessel, whereas the lower boundary is kept at 8°C. All the vertical side walls are insulated. The cooling temperature is varied periodically with several different conditions of amplitude and frequency. The corresponding ice-front movements are recorded accordingly. For a set of amplitude of the cooling temperature and ice-layer thickness, the critical frequency beyond which the ice-front movement is negligible (below 0.5mm) is determined. A time-lag of the front movement relative to the time-varying cooling temperature is also measured. A simple one-dimensional analysis is carried out in order to explain the above-mentioned critical frequency and time-lag. The PIV technique is also employed for studying convection flow structure in the liquid phase and the resulting ice-front deformation.