Aeration on a porous plate surface with micropores is an important method for preparing microbubbles. The characteristics of microbubbles generated on the surface of a microporous plate have been studied using a non-invasive digital image recognition method in a transparent squared flow channel. The effects of liquid flow rate, su-perficial gas velocity, liquid viscosity, liquid surface tension and average micropore size on the plate on the average diameter of bubbles ( dav ) were analyzed. The results show that dav decreases with increasing liquid velocity, in-creasing superficial gas velocity and decreasing surface tension. With increasing viscosity dav initially decreases first and then increases, and the minimum value of dav is obtained with a liquid viscosity of 1. 32 mPa·s. Based on the experimental results, empirical correlations are proposed describing the relationship between the average bubble di-ameter dav and the liquid Reynolds number, capillary number and gas-liquid ratio.
关键词
金属多孔平板/微孔曝气法/微气泡
Key words
porous metal plate/microporous aeration method/microbubble
维普
万方数据