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化工学报  2015 

多孔球层内水的过冷与蓄冷特性

DOI: 10.11949/j.issn.0438-1157.20140910, PP. 426-432

Keywords: 多孔介质,结晶,过冷度,相变,分布

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Abstract:

影响水过冷度的因素很多,同样实验条件下水的过冷度并非一个定值,多孔球层的存在对水的过冷度产生一定影响。对蒸馏水和不同球径的多孔球层介质进行了32次过冷度测定实验,并对蒸馏水和多孔球层介质的蓄冷特性进行了实验研究。过冷度实验结果采用统计方法进行分析,并用CCD相机和热像仪对过冷现象进行观察。结果表明:大温差降温条件下水的平均过冷度要小于阶梯缓慢降温条件下水的过冷度;多孔球层球径越小,平均和峰值过冷度越小,但直径为11mm出现特例,其平均过冷度比8mm直径多孔球层要小,峰值也比8mm的小;多孔球层固体基底的存在大大缩短了蓄冷相变时间。

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