PE微孔形成微气泡及其理论研究

Studies of Microbubble Formation and its Theoretics by PE Microporous

微气泡制造技术的改进与提高是气浮技术广泛应用的关键。研究了PE微孔膜管在剪切流剪切作用下形成微气泡的条件,从气泡形成机理上分析了膜管孔径大小、气体流量、剪切流流速和表面张力对气泡粒径分布的影响。实验采用静态显微摄像技术对气泡粒径分布进行了表征。实验结果表明,利用PE微孔膜管形成的气泡粒径在40～80μm之间,气泡平均粒径在44.3～60.5μm之间。膜管孔径大小、气体流量、剪切流流速、液相流体的表面张力是影响气泡粒径分布的主要因素。

The key of application air floatation technology is that improvement of microbubble formation. The condition of using PE microporous tube to produce microbubbles by cross-flow was studied, and the effect of pore size, air flow rate, cross-flow rate and Liquid properties on the initial bubble size distribution were analysed on the mechanism of bubbles formation. The bubble size distribution in this unit was measured by static micro-video and image analytics system. These results suggest that the microbubbles whose diameter is dominated from 40μm to 80μm, the initial bubble size distribution depend strongly on pore size and facial characteristics of the membrane tube, cross-flow rate and liquid surface tension.