Based on the multi-class bubble model and the assumption that bubbles rise in plug flow during dynamic gas disengagement, the function between gas holdup and time was obtained by using the pressure transducing technol...Based on the multi-class bubble model and the assumption that bubbles rise in plug flow during dynamic gas disengagement, the function between gas holdup and time was obtained by using the pressure transducing technology. The plot obtained by the model agreed with the plot obtained by experiment. The pressure transducing technology is shown to be a good method for the measurement of hydrodynamics in a bubble column. The changes of gas holdup, large bubble holdup and small bubble holdup, bubble rising velocity with superficial gas velocity and liquid viscosity were obtained by using dynamic gas disengagement.展开更多
The axial profile of gas holdups was measured using a γ-ray densitometry in the pressurized bubble column,0.3 m in diameter and 6.6 m in height.The principle of γ-ray measurement and data processing is discussed.The...The axial profile of gas holdups was measured using a γ-ray densitometry in the pressurized bubble column,0.3 m in diameter and 6.6 m in height.The principle of γ-ray measurement and data processing is discussed.The axial profile of gas holdups and its average value in two-phase system were obtained in the churn-turbulent flow regime with a gas velocity up to 0.40 m·s -1 and a system pressure up to 1.0 MPa, which are in agreement with results obtained by differential pressure method.The effects of superficial gas velocity, liquid surface tension, liquid viscosity and system pressure on the axial profile of gas holdups were investigated.It is shown that the gas holdup decreases with the increasing liquid viscosity and liquid surface tension, and increases with the increase of pressure and superficial gas velocity.展开更多
文摘Based on the multi-class bubble model and the assumption that bubbles rise in plug flow during dynamic gas disengagement, the function between gas holdup and time was obtained by using the pressure transducing technology. The plot obtained by the model agreed with the plot obtained by experiment. The pressure transducing technology is shown to be a good method for the measurement of hydrodynamics in a bubble column. The changes of gas holdup, large bubble holdup and small bubble holdup, bubble rising velocity with superficial gas velocity and liquid viscosity were obtained by using dynamic gas disengagement.
文摘The axial profile of gas holdups was measured using a γ-ray densitometry in the pressurized bubble column,0.3 m in diameter and 6.6 m in height.The principle of γ-ray measurement and data processing is discussed.The axial profile of gas holdups and its average value in two-phase system were obtained in the churn-turbulent flow regime with a gas velocity up to 0.40 m·s -1 and a system pressure up to 1.0 MPa, which are in agreement with results obtained by differential pressure method.The effects of superficial gas velocity, liquid surface tension, liquid viscosity and system pressure on the axial profile of gas holdups were investigated.It is shown that the gas holdup decreases with the increasing liquid viscosity and liquid surface tension, and increases with the increase of pressure and superficial gas velocity.