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首页> 外文期刊>ISIJ international >Fundamental Flow Characteristics in a Small Columnar Latent Heat Storage Bath
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Fundamental Flow Characteristics in a Small Columnar Latent Heat Storage Bath

机译：小型柱状潜热浴中的基本流动特性

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Latent heat storage is one of the key technologies to utilize waste heat because this technology enables to store thermal energy in high density and for long time. This study focuses on flow characteristics in heat storage bath in form of direct contact since it has great effects on operation limit or thermal efficiency. The two-phase flow behavior of immiscible fluids was measured in a small cylindrical heat storage bath which had a nozzle at the center of the bottom and was settled in a rectangular transparent tank. A heating medium oil was fed from the nozzle to the bath half filled with a phase change material (PCM). Two series of the experiments were carried out. One was cold isothermal experiment which used water as model PCM, and the other was heat storage experiment which used sodium acetate trihydrate as the PCM. The formation behavior of the heating medium droplet changed from single droplet at nozzle outlet, single droplet from liquid column, multiple droplet from liquid column to atomization at the nozzle with increase in inflow velocity of heating medium. At the interface between the PCM and the heating medium, the heating medium droplets accumulated, coalesced, enlarged and disrupted, then the heating medium was released from the PCM layer. Furthermore the variation of flow behavior in the heat storage bath with progress in phase change of the PCM was elucidated.
机译：潜热存储是利用废热的关键技术之一，因为该技术能够以高密度和长时间存储热能。这项研究集中在直接接触形式的储热浴中，因为它对运行极限或热效率有很大的影响。不溶混流体的两相流动特性是在一个小的圆柱形蓄热浴槽中测量的，该浴槽的底部中央有一个喷嘴，并沉降在一个矩形透明罐中。从喷嘴将载热油供入装有相变材料（PCM）的半槽中。进行了两个系列的实验。一个是使用水作为PCM模型的冷等温实验，另一个是使用三水合乙酸钠作为PCM的储热实验。随着加热介质流入速度的增加，加热介质液滴的形成行为从喷嘴出口处的单个液滴，液柱中的单个液滴，液柱中的多个液滴变为喷嘴处的雾化。在PCM和加热介质之间的界面处，加热介质液滴积聚，聚结，扩大并破裂，然后加热介质从PCM层释放。此外，阐明了随着PCM相变的进展，储热槽中流动行为的变化。

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