Hydrodynamic processes in dynamic bubble pressure experiments. 4. Calculation of magnitude and time of liquid penetration into capillaries

摘要

A numerical analysis and an approximate solution is presented to show that in bubble pressure experiments under certain conditions, a liquid meniscus can move into the capillary after bubble detachment. For wide and short capillaries this meniscus displacement is almost negligible, for narrow and long capillaries it can be much more than the capillary radius. However, the maximum displacement does not exceed 3% of the capillary length for capillary radii>10 #mu#m. The calculations show that the excess pressure in the gas reservoir at the end of the capillary does not effect very strongly the meniscus penetration depth, but strongly affects the time of the meniscus reverse movement.