Two-phase Flow Cfd Simulations Of Bubbling Crystallization Tube

Gas-liquid two phase flow is widely used in energy, power, nuclear, oil and many industrial sectors. It also plays an important role in cryastalization, agitated. The flow status of simple flow can be predicted by empirical formulas, but these could not show the process of flow. As development of bubble crystalization and increasing of system, the gas-liquid two phase flow of bubble crystalization has become more important in crystalization. The study of the gas-liquid two phase flow of bubble crystalization is focus on the the special gas velocity and the plus time. The effects of other factors concering are not in considering, so it is very important to comprehensive understand factors that can effect on the gas-liquid two phase flow of bubble crystalization.In this paper,the commercial computational fluid dynamics software FLUENT is used as a computing platform and selected the appropriate mathematical mode to simulate gas-liquid two phase flow of bubble crystal tube. Using the crystallization theory related to the bubble crystal and simulation results to determine more appropriate diameter of bubble crystal tube, the size of inlet gas velocity and form of bubbling. And related factors in the impact on the two-phase flow .Simplify the calculation of two-dimensional region , in order to facilitate the crystallization of the bubble tube gas-liquid two-phase flow simulation. Using GAMBIT software to establish the geometric model of the domain, select the VOF model to simulating two phase flow of crystalline tube with different diameters.Selecting a row and pulse intake mode to simulation the gas-liquid two phase flow of the optimal bubble diameters, and qualitative analysis the effect of two phase flow on the growth of crystal layer. And analysis the effects on two phase flow in different cases, for example: intake methods (continuous and pulsed), pulse duration, intermittent time and temperature. In this paper, we also simulated and comparative analysised different intake locations for industrial and laboratory equipment.Through the analysis of the result of the simulation above-mentioned concluded that best crystal tube diameter is 40mm; under the pulse condition form of Taylor bubbles in a shorter time,and the bubble more stable ,and a small number of dispersed bubbles around the taylor bubbles ; gas velocity 1.0m / s, pulse duration 0.4s,interval time 0.8s is about more appropriate for forming taylor bubbles; Industrial crystallization tube was formed bubble slug height first higher than the experimental device in the form of slug bubble 50mm.