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The γ-CT Measurement of Gas Holdup Distribution and Cfd Simulation of Gas-liquid Mixing in Rushton Stirred Tank

Author: LiWei
Tutor: LiuYueJin
School: Xiangtan University
Course: Chemical Engineering and Technology
Keywords: γ-CT measurement Gas holdup distribution CFD simulation Rushton gas-liquid stirred tank Gas-liquid mixing
CLC: TQ027
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


Rushton stirred tank in a wide range of applications in the fields of petrochemical, pharmaceutical, chemical, biological, chemical, CFD simulation technology has gradually become one of the primary means of study stirred tank mixing characteristics of the fluid. This paper first analyzes the homogenization of the gamma-ray multi-probe line, and the establishment of a uniform negative cumulative distribution and density distribution of both response model, the model can theoretically be used to identify and test multi-detection circuit 137Csγ ray CT homogenization. Γ-CT measurement techniques were measured Rushton gas-liquid stirred tank 3/4 at the cross-section of the gas holdup distribution images, and do a comparison, the analog value is in good agreement with the experimental values ??and CFD numerical simulation results. Rushton Euler - Euler two-fluid model to simulate the gas-liquid stirred tank 3/4 at the cross-section of the gas holdup distribution, different gas flow and stirring speed the gas holdup digital distribution curve, the calculation process considering bubble coalescence and rupture model and the drag coefficient correction. The results show that: the distribution of gas holdup increased with increasing gas flow rate and agitation speed, and gas flow more significant impact on the distribution of gas holdup; gas holdup distribution-intensive areas appear in the area above the impeller. Reynolds stress model combined with multi-reference frame method to simulate the characteristics of the gas-liquid mixing in Rushton gas-liquid stirred tank, get a different cross-section at the gas holdup size distribution law, and to do with the results measured by the gamma-ray CT experiment found that: In addition to the the effluents District CFD simulation and experimental values ??quite different outside better on circulation area under circulation area are consistent; highest gas holdup results show that the discharge flow area, in the high-speed rotation of the impeller, the fluid along the blade end face of the rapid discharge, the turbulent very strong. Radial liquid velocity by comparing the distribution side of the shape and axial distribution side shaped seen: single-phase flow radial velocity peak closer to stirring the tip of the blade, while the radial velocity of the two-phase flow peak occurs outward pan; When the critical state is reached, since the radial position of the blade outwardly of the end faces, the side shape of the ventilation on the distribution of the liquid velocity is almost no effect, but the stirring speed influence can not be ignored; in blade end face position, stirring speed and aeration rate on the axial distribution of the radial velocity impact, and ventilation effect is more pronounced changes in the radial velocity of the liquid phase. Shaped distribution side of the turbulent kinetic energy seen: whether the impact of the turbulent kinetic energy distribution of the radial or axial distribution of the turbulent kinetic energy, there is a peak, and the peak in the impeller where the plane; When you reach a critical state, stirring speed is huge ventilation of the turbulent kinetic energy is very small.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Mixing and mixing process
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