Study On The Gas-Phase Velocity Distribution In Cover Of CTST

The velocity distribution of gas-phase in cover of CTST was measured and studied in an experiment column with diameter of 600mm. In this paper, a numerical experiment method -Computational Fluid Dynamics (CFD) was used to investigate gas-phase's turbulent flow properties internal CTST.The gas velocity distribution was mearsured by hot-film anemometry, and it show that: the process of gas flowing in cover consists of three parts: convolution course, development course, spraying course. In the convolution course, there are two whirlpools in the cover when gas flows into cover. Gas flowing in the development course develops greatly. And in the spraying course, a portion of gas sprays from cover with high speed. In summary, the process of gas flowing in cover is composed by process of gas flowing vertically and course of the momentum transferred from center to circumambience. Influence of F0 on the flow is considered, and the main ones is that the more F0 is, the larger size of whirlpool becomes in convolution course, and the more F0 is, the more greatly gas sprays in spraying course.Recently, process of gas flowing in the cover is simulated by applying computational fluid dynamics (CFD), and a three-dimensional gas-dynamic model based on the k-ε turbulence model was used to describe the gas-phase turbulent flow in the cover of CTST, and was solved numerically by the method of control volume. For solving the pressure-velocity coupling equation, the SIMPLEC algorithm was used and a commercial CFD package-FLUENT was employed to solve other equations. The CFD simulations can describe the gas-phase hydrodynamics characters internal cover, and reveal whirlpool in cover. The predictions by the model were in agreement with experimental results received by using hot-film anemometry.