涡轮搅拌桨混合时间数值计算

Numerical Calculation of Mixing Time in Turbine Agitated Tank

混合时间是表征搅拌槽内流体混合状况的重要参数之一。利用CFD方法计算了单层涡轮搅拌槽内流体混合过程的流动场和浓度场,研究了物料在搅拌槽内的混合过程以及不同监测点位置对混合时间的影响。结果表明,拌槽内物料的混合主要受槽内流体流动形式所影响,混合时间的长短与监测点位置有关,在桨叶附近进行监测所得到的混合时间较短,在液面附近进行监测所得的混合时间较长。在实际生产和试验中,应注意对监测点位置的选取。

Mixing time was an important parameter which describes mixing conditions in stirred tank. Velocity and concentration field in single turbine agitated tank were calculated by means of CFD and the influences of detecting position on mixed times were discussed specially. The results showed that the mixing process of material in agitated tank was controlled by velocity field. Mixed time related to detecting position and the mixed time of charging-up close to blade was shorter than that in liquid level. In actual production and test, the selection of detecting positions should be paid attention.