The transition from homogeneous to heterogeneous flow in a gassed, stirred vessel

被引:17
作者
Gezork, KM [1 ]
Bujalski, W
Cooke, M
Nienow, AW
机构
[1] Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, W Midlands, England
[2] ICI Expt Ctr, Proc Grp, ICI Technol, Widnes, England
关键词
stirred vessel; homogeneous-heterogeneous transition (observation and modelling); hydrodynamics; bubble size distribution; flow regime transition; video technique;
D O I
10.1205/026387600527482
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Much 'old' work has been undertaken studying gas-liquid systems in stirred reactors (Nienow(1)). However, this 'old' work has generally been limited to specific ungassed energy dissipation rates, (epsilon(T))(0), up to similar to 2 W kg(-1) and gas flow rates of up to similar to 2 vvm (or superficial gas velocity, nu(s), of < similar to 0.01 ms(-1)). Recent developments have led to the need to operate modern reactors at much higher values of epsilon(T) and nu(s). This preliminary study reports work under such conditions and also builds on studies at very high gas velocities in bubble columns, Under such conditions, a transition from homogeneous to heterogeneous flow occurs. The results show that under well dispersed conditions, the transition occurs at lower gas velocities for the coalescence-inhibited solutions in comparison to water. Possible reasons for these findings and for the formation of large bubbles at this transition are discussed. A simple model on the basis of a gas volume balance is proposed which matches the trend. The impact of the intense operating conditions on a range of other mixing parameters is also reported.
引用
收藏
页码:363 / 370
页数:8
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