Experimental investigation on inhomogeneity of ice packing factor in ice slurry flow
Experimental investigation on inhomogeneity of ice packing factor in ice slurry flow
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DOI：
10.1016/j.ijrefrig.2016.07.006
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
T. Asaoka;A. Tajima;H. Kumano
中科院分区：
文献类型：
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作者：
T. Asaoka;A. Tajima;H. Kumano
我们研究了冰浆中的不均匀性，这种不均匀性会导致压降突然增加和流动阻塞等问题。虽然在以往的许多研究中，充分分散的冰浆流被假设为均匀的，但在实际测量中，不均匀性表现为物理性质的变化。从实验中发现，压降在开始时波动较小，但经过较长时间后会变大。此外，冰浆中包含的冰颗粒大小也会影响这种波动。我们认为这种波动是由IPF的变化引起的，因为它只出现在层流中。这意味着冰浆在长时间流动后不是均匀的。从目前的研究中，IPF的变化估计最大为2.6 wt%。虽然IPF变化的物理机制尚未明确，但我们认为这是冰颗粒在管道中积累/粘附的结果。
We investigated inhomogeneity in ice slurry, which can pose problems such as sudden increase in pressure drop and blockages in flow. Although in many previous studies fully dispersed ice slurry flow is assumed homogeneous, inhomogeneity appears as a variation in physical properties in the actual measurements. From experiments, it was found that the fluctuation in pressure drop is relatively small at the beginning, but becomes larger after long-term periods. Additionally, the ice particle size included in the ice slurry also affects this fluctuation. We supposed the fluctuation is caused by the variation in IPF, because it appears only in laminar flow. This implies ice slurry is not homogeneous after long flow periods. From the present study, the variation of IPF was estimated to be 2.6 wt% at maximum. Although the physical mechanism of the variation in IPF has not been clarified, we suggest that it is a consequence of the accumulation/adhesion of ice particles in the pipe.