Numerical Simulation Of Two Phase Separation Flow Field In Corrugated Plate

Corrugated plate is an important separation element in gas-liquid separator. The fluid flow within the plate passage is a process involving the interaction of the gas and liquid phases and a separation movement accompanied with a number of complex physical phenomena, such as droplet coalescence and broken. Domestic researching result about the corrugated plate is mainly relies on the experience design and repeatedly test. At present, hydrodynamic characteristics of two-phase flow of gas and liquid in the separating passage as well as the theoretical mathematical model of the separation process are rarely reported.Firstly, the paper was carried out from the perspective of the droplet dynamics and the stress analysis of droplets with the corrugated plate passage.Then the cross mixed model is used to the corrugated plates gas-liquid separation theory the mathematical model is established to describe the flow channel process and the theoretical calculation formula about corrugated plate separation efficiency and pressure drop was obtained. During the numerical simulation process, the Computational Fluid Dynamics method was used, and FLUENT software is adopted to simulate the separating process of the corrugated plates. For the turbulent flow, the RNG k-ε model is applied, which is suitable for curved streamline flow. The droplet size carried by gas is depicted according to Rosin-Rammler distribution function. The simulation is carried at different inlet airflow velocity, different flow field plates and different corrugation pitch angle combinations, taking the interaction between gas flow and droplet into account, and the motion of the droplet is tracked by discrete phase model(DPM), and the influence of various parameters on the separation efficiency and pressure drop and liquid droplet trajectories are obtained. Design of corrugated plate gas-liquid separation performance test station, experiment station can achieve the highest flow velocity is 18m/s, the atomization system stable droplets are mainly distributed below 100μm, the performance of the corrugated plates with different plate distance and corrugated angle was tested. The numerical simulating results have good agreement with the experimental results on the changing tendency. Thus, the theoretical calculation model and numerical simulation method were verified. Finally, some suggestions for example the corrugated plate designing inclination angle should not exceed 45° is proposed.In this paper, three methods of the theoretical analysis, numerical simulation, and experimental test is used together, the separating process of gas and liquid within the corrugated plate passage is carried out, and a more comprehensive understanding of the corrugated plate gas-liquid separation process objective laws is achieved. This is not only conducive to the development of efficient corrugated plate separator element, but also has important significance for the development of gas-liquid separator with high efficiency and compact size.