Method for measuring liquid film breakage ratio in thin liquid film

摘要

Problem to be solved: to provide a liquid film rupture rate measuring method of a liquid film having high accuracy and excellent operability.Solution: the two walls of the same material which are opposed to each other through the liquid film aOn the wall CA ofA measurement device is provided using an ultrasonic probe B(A1) the sound pressure h of the reflected wave of ultrasonic waves emitted from the ultrasonic probe toward the wall CB is measured.(B1) about the measured sound pressure HBoth wall CABased on the measured sound pressure ho in the void state without the liquid film between CBNormalized sound pressure ratio H (= H / HO) is set.Based on the "frequency to sound pressure ratio" characteristic obtained from the frequency and the set sound pressure ratio H measured for (C1).The sound pressure ratio ha of the frequency zero condition is estimated or measured.(D1) using the sound pressure ratio haOn the basis of the characteristics of sound pressure ratio ha to liquid membrane rupture ratio in the frequency zero conditionThe liquid membrane rupture rate is measured.Diagram