Bubble behavior was observed by using high-speed digital camera in a two-dimensional rectangular bubble column of 0.20 m(width)× 0.02 m(thickness)× 2.00 m(height).Air and water were used as gas and liquid ph...Bubble behavior was observed by using high-speed digital camera in a two-dimensional rectangular bubble column of 0.20 m(width)× 0.02 m(thickness)× 2.00 m(height).Air and water were used as gas and liquid phases,respectively.Hydrodynamic simulation was conducted in the platform of commercial software package,ANSYS CFX 10.0,by combining the classical two-fluid model of turbulence and GRACE drag model.The computational distributions of bubble size from the MUSIG(multiple size group)model considering bubbles breakup and coalescence were in good agreement with experimental data,which showed that this model could be used to predict the bubble size distribution in the gas-liquid bubble column.展开更多
The axial and radial profiles of the gas holdup and bubble parameters in an external-loop airlift reactor of inner diameter 0.09 m and height 1.8 m were measured with the differential pressure method and dual-tip elec...The axial and radial profiles of the gas holdup and bubble parameters in an external-loop airlift reactor of inner diameter 0.09 m and height 1.8 m were measured with the differential pressure method and dual-tip electrical conductivity probe at different superficial gas velocities.Air and water were used as the gas and liquid phases,respectively.The experimental data of the average and local gas holdups,bubble size and its distribution,bubble rising velocity,bubble frequency and gas-liquid interfacial area were obtained,and were analyzed based on the gas-liquid flow field and bubble-bubble interaction.The local gas holdup was correlated in terms of superficial gas velocity,axial height and radial position based on the experimental data.展开更多
文摘Bubble behavior was observed by using high-speed digital camera in a two-dimensional rectangular bubble column of 0.20 m(width)× 0.02 m(thickness)× 2.00 m(height).Air and water were used as gas and liquid phases,respectively.Hydrodynamic simulation was conducted in the platform of commercial software package,ANSYS CFX 10.0,by combining the classical two-fluid model of turbulence and GRACE drag model.The computational distributions of bubble size from the MUSIG(multiple size group)model considering bubbles breakup and coalescence were in good agreement with experimental data,which showed that this model could be used to predict the bubble size distribution in the gas-liquid bubble column.
文摘The axial and radial profiles of the gas holdup and bubble parameters in an external-loop airlift reactor of inner diameter 0.09 m and height 1.8 m were measured with the differential pressure method and dual-tip electrical conductivity probe at different superficial gas velocities.Air and water were used as the gas and liquid phases,respectively.The experimental data of the average and local gas holdups,bubble size and its distribution,bubble rising velocity,bubble frequency and gas-liquid interfacial area were obtained,and were analyzed based on the gas-liquid flow field and bubble-bubble interaction.The local gas holdup was correlated in terms of superficial gas velocity,axial height and radial position based on the experimental data.
