佳佳 李 | Sino british college (original) (raw)
佳佳 李
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Papers by 佳佳 李
In this paper, experimental data on the mixing time of the continuous phase and power consumption... more In this paper, experimental data on the mixing time of the continuous phase and power consumption of gas-liquid-liquid dispersions in a mechanically agitated baffled tank are presented. The electrical conductivity method is taken for the measurement of mixing time and the shaft-torque method for power consumption measurement. Tap water is used as the continuous phase, and kerosene and air as the dispersed ones. The effects of probe/tracer injection position, agitation speed, type of impeller, clearance of impeller off tank bottom, oil volume fraction, gas holdup and physical properties of the dispersed liquids on the macro-mixing of the gas-liquid-liquid system have been investigated. The phenomenon of gas-liquid-liquid macro-mixing in a stirred tank is largely similar to that of liquidliquid and gas-liquid stirred tanks. Our experiments indicate that the gas-liquid-liquid macro-mixing can be enhanced at higher gas holdups while damped at low gas holdups. Contrary to gas effect, the dispersed oil phase at low holdups increases the macro-mixing intensity but at higher holdups decreases the macro-mixing intensity of the continuous phase. The experimental results show that axial impellers are more energy efficient for gas-liquid-liquid macro-mixing than radial impellers. A simple correlation is developed for predicting the mixing time in gas-liquid-liquid three-phase systems and satisfactory agreement with experimental data is observed.
In this paper, experimental data on the mixing time of the continuous phase and power consumption... more In this paper, experimental data on the mixing time of the continuous phase and power consumption of gas-liquid-liquid dispersions in a mechanically agitated baffled tank are presented. The electrical conductivity method is taken for the measurement of mixing time and the shaft-torque method for power consumption measurement. Tap water is used as the continuous phase, and kerosene and air as the dispersed ones. The effects of probe/tracer injection position, agitation speed, type of impeller, clearance of impeller off tank bottom, oil volume fraction, gas holdup and physical properties of the dispersed liquids on the macro-mixing of the gas-liquid-liquid system have been investigated. The phenomenon of gas-liquid-liquid macro-mixing in a stirred tank is largely similar to that of liquidliquid and gas-liquid stirred tanks. Our experiments indicate that the gas-liquid-liquid macro-mixing can be enhanced at higher gas holdups while damped at low gas holdups. Contrary to gas effect, the dispersed oil phase at low holdups increases the macro-mixing intensity but at higher holdups decreases the macro-mixing intensity of the continuous phase. The experimental results show that axial impellers are more energy efficient for gas-liquid-liquid macro-mixing than radial impellers. A simple correlation is developed for predicting the mixing time in gas-liquid-liquid three-phase systems and satisfactory agreement with experimental data is observed.