Two-phase countercurrent flow through a bed of packing. III. Evaluation of experimental data

1968 ◽  
Vol 33 (8) ◽  
pp. 2722-2727 ◽  
Author(s):  
V. Kolář ◽  
Z. Brož
Keyword(s):  
Experimental Data ◽  
Countercurrent Flow ◽  
Two Phase ◽  
Flow Through

Study of Bubbly Flow Through a Packed Bed

2011 ◽  
Author(s):  
Daeseong Jo ◽  
Shripad T. Revankar
Keyword(s):  
Experimental Data ◽  
Comparative Study ◽  
Bubble Size ◽  
Bubbly Flow ◽  
Packed Bed ◽  
Bubble Coalescence ◽  
Size Distributions ◽  
Two Phase ◽  
Bubble Breakup ◽  
Flow Through

A two phase bubbly flow through a packed bed was studied for dominant bubble breakup and coalescence mechanisms through experiments and CFD modeling. Data on various two-phase parameters, such as local void fraction, bubble velocity, size, number, and shape were obtained from the high speed video images. Results indicated that when a flow regime changed from bubbly to either trickling or pulsing flow, the number of average size bubbles significantly decreased and the shape of majority of bubbles was no longer spherical. The bubble coalescence and breakup mechanisms depend on local conditions such as local velocity of the bubble and pore geometry. The CFD analysis using CFX software package was carried out to study bubble size distributions. In the analysis the models for interactions were examined for each case of bubble breakup flow and bubble coalescence. A comparative study was performed on the resulting bubble size distributions, breakup and coalescence rates estimated by individual models. For change of bubble size distributions along the axial direction medians was used as an comparative parameter and the CFD results on bubble medians were compared against the experimental data. This comparative study showed that the predictions estimated by CFD analyses with the bubble breakup and coalescence models currently available in the literature do not agree with the experimental data.

Paper 15: Critical Conditions during the Flow of Two-Phase Mixtures through Nozzles

1967 ◽  
Vol 182 (8) ◽  
pp. 145-151
Author(s):  
D. Chisholm
Keyword(s):  
Experimental Data ◽  
Water Flow ◽  
Liquid Mixtures ◽  
Critical Conditions ◽  
Sonic Velocity ◽  
Two Phase ◽  
Flow Through

Equations are developed for the flow of gas-liquid mixtures through nozzles under conditions of critical or ‘choking’ flow. The equations are compared with experimental data obtained during air-water flow through nozzles and pipes at almost atmospheric pressures. Comparison is also made with data on the sonic velocity in mixtures. Additional problems arising with vapour-liquid mixtures are also discussed.

CFD Simulation of Gas-Liquid Two-Phase Flow Through an Orifice in Millimeter-Scale Rectangular Channel

2013 ◽  
Author(s):  
Fuad Ismayilov ◽  
Olusegun J. Ilegbusi
Keyword(s):  
Experimental Data ◽  
Cfd Simulation ◽  
Two Phase Flow ◽  
Phase Transfer ◽  
Rectangular Channel ◽  
Phase Flow ◽  
Two Phase ◽  
Contraction Ratio ◽  
Fraction Distribution ◽  
Flow Through

A numerical model is developed and used to simulate gas-liquid two-phase flow through a plate orifice in a millimeter-scale channel. The channel width is 50 mm and the height is varied from 1.00 mm to 2.00 mm. The contraction ratio and thickness of the orifice are varied over the range 0.04–0.4 and 5–20 mm respectively. The model utilized is based on the multiphase-mixture principle in which transport equations are solved for the mixed phase velocities with allowance for interpenetration of phases and intra-phase transfer processes. The predicted velocity profiles are successfully validated by comparison with the available experimental data for the mixture velocity. The predictions also extend beyond the experimental data to provide the detailed effect of contraction ratio on the flow and gas fraction distribution in the channel. In the range of parameters investigated, the predictions indicate that the flow in such channels will produce no wake in the lee of the orifice for contraction ratios >0.2.

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