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化工学报  2015 

基于CCDM的流态化制冰的多相流动与传热特性

DOI: 10.11949/j.issn.0438-1157.20141338, PP. 1272-1281

Keywords: 多相流,流态化,传热,颗粒流,CCDM,碰撞聚并,制冰

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Abstract:

流态化制冰是一种新型的直接接触式动态制冰方式,通过建立联合连续和离散模型的CCDM(combinedcontinuumanddiscretemodel)全耦合模型,采用一种非结构网格颗粒搜索法,计算了流态化制冰过程所涉及的颗粒-流体多相系统的流动和传热特性。结果表明:基于CCDM模型计算出的结果与实验数据有较好的一致性,模型的准确度高;冻结程度关键值的提出,简化了颗粒间碰撞模型的判断和颗粒相表面传热量的等效计算;颗粒间的碰撞、聚并对颗粒粒径的作用,会进一步影响颗粒的运动速度、停留时间以及轴向浓度分布的变化,难以忽略其对于流态化制冰过程的多相流动与换热特性的影响。

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