发泡多孔介质对泡沫粒径的影响

通过泡沫粒径测量实验和发泡多孔介质的恒速压汞实验研究不同长度、不同孔隙结构发泡多孔介质的发泡效果,确定泡沫粒径的最小表征单元和泡沫生成稳定时需要的"扰动单元"数量。结果表明:当单幅图像中的泡沫数量高于120时,泡沫粒径的变异系数将趋于稳定,能够消除泡沫粒径的影响;采用扰动单元和扰动单位的概念能更能准确地从泡沫产生机理上评价发泡多孔介质的发泡能力,且当扰动单元数量达到100±20个时,泡沫的变异系数小于0.5,泡沫的粒径均质程度较好;泡沫平均粒径约为主流喉道直径的1.23~1.51倍,均小于平均孔隙直径,在相同的多孔介质中一旦产生能够起到较好的封堵作用。

Influence of foam porous media on bubble size

The foaming effect of porous media with different length and pore structure was studied using the bubble size measurement and foam porous medium constant speed mercury injection, through which the minimum characterization of bubble size and the amount of "disturbance unit" needed for stable bubble generation were determined. The results show that when the numbers of bubbles in a single image are more than 120, the variation coefficient of bubble particle size will stabilize, and the influence of bubble particle size can be eliminated. Using perturbation and disturbance units can be more accurate evaluation from the mechanism of bubble foam foaming capacity of porous media. It is found that when disturbance unit quantity reaches to 100±20, and the bubble variation coefficient is less than 0.5, the bubble size homogeneous degree is better. Also the average particle size is 1.23-1.51 times larger than the bubble mainstream throat diameter, which is less than the average pore diameter. Therefore, the foam can have good blocking capability once it can be generated in the same porous medium.