泡沫碳化硅填料孔内流体微观流动特性研究

Microscopic experimental characterization of liquid flow in hole of Si C foam packings

为了从微观角度探究泡沫碳化硅填料内部孔道的流动特性,采用高速摄影和示踪粒子法相结合的可视化方法,在微观尺度下观测液体在泡沫碳化硅波纹规整填料内部的流动特性。通过对获得图像数据的分析发现,当流量为20~120 m L/min时,部分流经液体在泡沫碳化硅填料孔道内形成稳定的涡旋流。在此基础上,进一步考察了液体流量对泡沫碳化硅波纹填料片孔内涡旋流动的尺度和强度影响,结果表明,在低流量条件下,随着流体流量从20 m L/min增加到120 m L/min,孔内涡旋的半径减小、稳定性增强且旋流速度增加。

The visualization method combining high-speed photography with tracer particle method is used to observe at a micro scale the flow characteristics of liquid in the foam silicon carbide corrugated packing. Through analyzing the image data,it Is found that part of liquid forms a stable vortex in the pores of silicon carbide foam packings when the flow rate is in the range of 20-120 m L·min-1.Moreover,the effects of liquid flow rate on the vortex are studied.Results show that under low flow conditions,as the fluid flow rate increases from 20 m L·min-1 to 100 m L·min-1,the radius of the vortex in the holes decreases,the stability enhances,and the rotation speed increases.