摘要
因多相流动中汽液速度差而造成相积存(Holdup)是深冷混合工质节流制冷系统中混合物浓度偏析的一个重要因素。建立了因相积存造成浓度变化的计算模型,采用Palmer对Beggs-Brill-Moody关联式的修正式,详细考察了管道倾角及流体温度对深冷多元混合物因汽液相积存异造成的浓度偏析影响。计算结果表明,管道倾角对积存具有显著影响,其中倾斜向上会显著增加积存,造成混合物浓度显著变化。浓度变化发生在两相区,并随温度变化导致不同组分的浓度变化趋势不同。
The phase holdup caused by the velocity difference in the two- phase flow is one of the most important reasons for the composition shift of multicomponent mixtures. A model for calculating the composition shift was described. The Palmer modified Beggs- Brill- Moody correlation was employed in the calculation. With this model, influences of pipe angle and fluid temperature on the composition shift were discussed. The results show that the increase of the angle affects the hold - up obviously and then the composition shift varies greatly. The variation of the mixture concentration only occurs in the two- phase region and the concentration variation of different compositions changes with the temperature.
出处
《制冷学报》
CAS
CSCD
北大核心
2006年第4期10-12,共3页
Journal of Refrigeration
基金
国家自然科学基金资助项目(50206024)
关键词
工程热物理
浓度变化
计算分析
相积存
多元混合工质
Engineering thermophysics
Composition Shift
Prediction
Phase holdup
Multicomponent mixed- refrigerant
