Meniscus formation in a capillary and the role of contact line friction

摘要: We studied spontaneous formation of an internal meniscus by dipping glass capillaries 25 μm to 350 radii into low volatile hexadecane and tributyl phosphate. X-ray phase contrast high speed optical microscopy imaging were employed. showed that the completes its when liquid column is still shorter than capillary radius. After that, travels about ten at a constant velocity. demonstrated experimental observations can be explained introducing friction force linearly proportional velocity with coefficient depending on air/liquid/solid triplet. It was does not depend Numerical solution balance equation revealed four different uptake regimes specified in portrait. This portrait found good agreement results used as guide for design thin porous absorbers.