轴流式搅拌桨搅拌槽内混合时间的数值模拟

Numerical simulation of mixing time in agitated tank with axial agitator blade

利用计算流体力学软件FLUENT 6.0程序计算了单层CBY搅拌槽内流体混合过程的速度场和浓度场,讨论了加料点位置和监测点位置对混合时间的影响。结果表明,拌槽内物料的混合过程主要由槽内的流体流动所控制;混合时间与加料点位置有关,在桨叶附近区域加料时混合时间比在液体表面加料时的混合时间短,应尽量在搅拌反应器的桨叶尖端处加料;不同的监测点位置对混合时间有很大的影响,在靠近槽底部进行监测所得到的混合时间最短。

Velocity and concentration field in agitated tank with single layer axial agitator blade were calculated by means of CFD software FLUENT 6.0,and the influences of feeding and detecting positions on mixing times were discussing.The results showed that the mixing process of material in agitated tank was controlled by velocity field;Mixing time was related to feeding position and the mixing time for charging in close to blade was shorter than that in liquid level.The method of feeding in tip of blade should be...