CFD Simulation of Solid Suspension for a Liquid–Solid Industrial Stirred Reactor

Applied Sciences

Romeo Susan-Resiga¹  Adrian Stuparu¹  Alin Bosioc¹ 

[1] MMUT, Faculty of Mechanical Engineering, Politehnica University Timisoara, 300006 Timisoara, Romania;

关键词: stirred tank;    CFD;    three-phase flow;    liquid–solid;    Eulerian;   

DOI  :  10.3390/app11125705

来源: DOAJ

【 摘 要 】

The present study examines the possibility of using an industrial stirred chemical reactor, originally employed for liquid–liquid mixtures, for operating with two-phase liquid–solid suspensions. It is critical when obtaining a high-quality chemical product that the solid phase remains suspended in the liquid phase long enough that the chemical reaction takes place. The impeller was designed for the preparation of a chemical product with a prescribed composition. The present study aims at finding, using a numerical simulation analysis, if the performance of the original impeller is suitable for obtaining a new chemical product with a different composition. The Eulerian multiphase model was employed along with the renormalization (RNG) k-ε turbulence model to simulate liquid–solid flow with a free surface in a stirred tank. A sliding-mesh approach was used to model the impeller rotation with the commercial CFD code, FLUENT. The results obtained underline that 25% to 40% of the solid phase is sedimented on the lower part of the reactor, depending on the initial conditions. It results that the impeller does not perform as needed; hence, the suspension time of the solid phase is not long enough for the chemical reaction to be properly completed.

【 授权许可】

Unknown