Investigation of the unsteady two-phase flow with small bubbles in a model bubble column using phase-Doppler anemometry

被引:14
作者
Brenn, G [1 ]
Braeske, H [1 ]
Durst, F [1 ]
机构
[1] Univ Erlangen Nurnberg, Lehrstuhl Stromungsmech, LSTM, D-91058 Erlangen, Germany
关键词
bubble column; phase-Doppler anemometry; hydrodynamics; multiphase flow; slip velocity; multiphase reactors;
D O I
10.1016/S0009-2509(02)00423-2
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The unsteady two-phase flow of water laden with small air bubbles in a model bubble column is investigated experimentally. Phase-Doppler anemometry (PDA) is used for measuring the velocities of water and bubbles. The measured sizes of reflecting tracers in the water and of the air bubbles are used to discriminate between water and bubble data. The investigations are focussed on the unsteady behaviour of the flow and on the interaction between the two phases. The measurement of relative (slip) velocities between bubbles and water reveals information about the dynamic behaviour of the two-phase system under the action of buoyancy on the disperse phase. The evaluation of time series of bubble velocities yields insight into typical frequencies at which the flow fluctuates. It is shown that, at all locations in the flow field, the velocity probability density functions of bubbles and liquid can be described by two superimposed Gaussian functions. The bubbles belonging to the two Gaussians exhibit different slip velocities. The probability for the occurrence of bubble collisions is quantified on the basis of the PDA data. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:5143 / 5159
页数:17
相关论文
共 41 条
[1]   PHASE-DOPPLER ANEMOMETER MEASUREMENT OF BUBBLE CONCENTRATIONS IN LABORATORY-SIMULATED BREAKING WAVES [J].
ASHER, WE ;
FARLEY, PJ .
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1995, 100 (C4) :7045-7056
[2]   Dynamic flow behaviour in bubble columns [J].
Becker, S ;
De Bie, H ;
Sweeney, J .
CHEMICAL ENGINEERING SCIENCE, 1999, 54 (21) :4929-4935
[3]   Gas-liquid flow in bubble columns and loop reactors: Part II. Comparison of detailed experiments and flow simulations [J].
Becker, S. ;
Sokolichin, A. ;
Eigenberger, G. .
CHEMICAL ENGINEERING SCIENCE, 1994, 49 (24B) :5747-5762
[4]   Applicability of the standard k-ε turbulence model to the dynamic simulation of bubble columns.: Part II:: Comparison of detailed experiments and flow simulations [J].
Borchers, O ;
Busch, C ;
Sokolichin, A ;
Eigenberger, G .
CHEMICAL ENGINEERING SCIENCE, 1999, 54 (24) :5927-5935
[5]  
Braeske H, 1998, CHEM ENG TECHNOL, V21, P415, DOI 10.1002/(SICI)1521-4125(199805)21:5<415::AID-CEAT415>3.0.CO
[6]  
2-T
[7]  
BRAESKE H, 1998, P PARTEC 98 7 S PART, P141
[8]  
BRAESKE H, 1998, P 3 INT C MULT FLOW
[9]   LASER-DOPPLER MEASUREMENTS OF BUBBLE DYNAMICS [J].
BRANKOVIC, A ;
CURRIE, IG ;
MARTIN, WW .
PHYSICS OF FLUIDS, 1984, 27 (02) :348-355
[10]   FLOW STRUCTURE IN A 3-DIMENSIONAL BUBBLE-COLUMN AND 3-PHASE FLUIDIZED-BED [J].
CHEN, RC ;
REESE, J ;
FAN, LS .
AICHE JOURNAL, 1994, 40 (07) :1093-1104