摘要
具有微孔的多孔平板表面曝气是制备微气泡的重要手段之一。采用非侵入式数字图像识别法对金属多孔平板表面生成的微气泡特性进行实验研究,考察了平板上方液相流速、表观气速、液相黏度、表面张力和平板平均孔径对生成气泡平均直径(dav)的影响。结果表明:dav随着液相流速的增大而减小,随表观气速的增大和表面张力的减小而减小;液相黏度则对dav有双重影响,随着黏度的增加dav先减小后增大,且在黏度为1.32 mPa·s时最小。最后,提出了描述气泡平均直径与液相雷诺数、毛细管数和气液比之间关系的经验关联式。
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,superficial 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,increasing 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 diameter dav and the liquid Reynolds number,capillary number and gas-liquid ratio.
作者
楼琨
蔡子琦
刘新卫
马鑫
高正明
LOU Kun;CAI ZiQi;LIU XinWei;MA Xin;GAO ZhengMing(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第2期19-27,共9页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(22078008&22178014)。
关键词
金属多孔平板
微孔曝气法
微气泡
porous metal plate
microporous aeration method
microbubble
