旋转热管生物反应器搅拌结构的数值模拟

CFD simulation of rotating heat pipe bioreactor with different mixing structures

针对不同搅拌结构形式的新型旋转热管生物反应器内的流动特性进行数值模拟。建立旋转热管生物反应器的数值模型,将多重参考系法(MRF)与滑移网格法(SM)相结合,选用标准k-ε湍流模型模拟计算反应器内的速度分布,并对作为搅拌结构的热管蒸发段上桨叶的倾斜角度(α)在0°、15°、30°和45°时的搅拌功率和混合时间进行计算。结果表明:在搅拌结构中,有热管蒸发段桨叶反应器的轴向形成了3个漩涡区,轴向平均流速相对较高,并且靠近自由液面附近的流速也较大。随着桨叶倾斜角度的增加,反应器液面附近速度减小,搅拌功率减小,混合时间变长。

Flow characteristics of different mixing formations for new-type rotating bioreactor were studied with computational fluid dynamics（CFD）.The numerical model of the rotating heat pipe bioreactor was established.The flow and the mixing process in the bioreactor were calculated with the standard k-ε turbulent model,multiple-reference frame method（MRF） and sliding mesh method（SM）.The stirring power and the mixing time were calculated on heat pipe evaporator with different inclination angles（α） of 0°,15°,30°,and 45°.The result indicated that the mixing structure with blade of heat pipe evaporator led to the formation of three ring vortices around the axial position.Therefore,the mean velocity of the axial was relatively higher and the flow near the free surface was intensified.With the increasing of inclination angle,the flow rate near the free surface and power consumption decreased but the mixing time increased.