摘要
在柱径为50mm的折流板脉冲萃取柱中,首先利用吹气法研究了硝酸水溶液和30%TRPO煤油水溶液体系的单相流时均摩擦压降Δpf特性.实验结果表明当A′ω≠0,且uc=0时,Δpf可以忽略;而当A′ω=0时,Δpf与uc满足Noh模型的线性关系.在Noh模型的基础上,给出了计算A′ω≠0时单相流时均摩擦压降的模型,实验结果与模型预测相一致.在单相流摩擦压降的基础上,又研究了连续相分别为硝酸溶液和30%TRPO煤油溶液体系的两相流时均摩擦压降Δpf特征.实验结果表明:两相流时均摩擦压降Δpf可用于计算分散相存留分数,其近似由连续相所对应的Noh单相流模型求得,并可用于折流板脉冲萃取柱分散相存留分数的确定.
The characteristics of the time-averaged frictional pressure drop in single-phase flow, which was determined by the air purge method, for the HNO3 solution and 30% TRPO-Kerosene solution through a 50mm-diameter discs and doughnuts pulsed extraction column were studied firstly. Experimental results showed that the time-averaged frictional pressure drop could be neglected at the condition of A＇ω≠0 and uc=0, but Noh＇s linear relation to uc at A＇ω=0 was satisfied. The frictional pressure drop could be estimated by Noh＇s model at A＇ω≠0, which was improved for the discs and doughnuts pulsed extraction column. The values predicted by the model were in good agreement with those obtained by experiments.Then the time averaged frictional pressure drop in two-phase flow and the dispersed phase holdup in the column, for the HNO3 solution and 30% TRPO-Kerosene solution were studied. Experimental results showed that Noh＇s model, which was developed for the reciprocating plate extraction column could be used for estimating the dispersed phase hold-up in a discs and doughnuts pulsed extraction column. Here, it was stressed that in the model, the two-phase time averaged frictional pressure drop,△pi^-, could be predicted by the equation for the single-phase flow that is the corresponding continuous phase in the two-phase flow.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第7期1253-1259,共7页
CIESC Journal
关键词
折流板脉冲萃取柱
摩擦压降
吹气法
存留分数
discs and doughnuts pulsed extraction column
frictional pressure drop
air purgemethod
holdup
