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Thesis Advisor陈家镛
Degree Grantor中国科学院研究生院
Other AbstractIn present work, an interactive mathematical model for the dispersed liquid-liquid countercurrent two phase flow in column-type extractors was proposed. A pseudo-fluid model for the dispersed two phase flow of drops was developed by assuming a simple similarity between the motion of a single drop in infinite continuous medium and that of a drop moving in a suspension defined as pseudo-fluid composed f continuous medium and all the other droplets present. The expressions of buoyancy force, drag force and drag coefficient for a drop in dispersion were formulated in terms of the pseudo-density, mean density and apparent viscosity of the pseudo-fluid, taking into account of the effects of both velocity profile of the continuous medium in interstices of the drops and the presence of other drops. The equations of motion of a multi-droplet system in a form identical with those of a single drop system can be derived from the pseudo-fluid model and thus simplifies the description of the characteristics of dispersed two phase flow. On the basis of the traditional diffusion model, a population balance equation for dispersed phase drops was established. This equation could take into account such as relative effect of the forward mixing, turbulent diffusion and droplet mixing processes of breakage and coalescence on the hydrodynamic behavior of column extractors. In view of the material unbalance of the flow of dispersed phase through the column encountered in simulation, a non-equilibrium thermodynamic approach was attempted to investigate the stability of the countercurrent two phase flow in the column and thus to analyze the problem of the unbalance. Based on the assumption of a linear system, an expression for entropy production due to various irreversible processes occurred inside the reciprocating plate extraction column was deduced. The modelling of the two phase flow in a column was thus subject to the constraint of minimization of rate of entropy production and also to the constraint of hydrodynamics.
Document Type学位论文
Recommended Citation
GB/T 7714
鲍晓军. 柱式萃取设备内液-液两相流体动力学及其稳定性的研究[D]. 中国科学院研究生院,1990.
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柱式萃取设备内液-液两相流体动力学及其稳(6210KB) 限制开放CC BY-NC-SAApplication Full Text
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