泡膜の移動による動的ぬれ

抄録

Dynamic wetting was measured by moving a foam film in a glass tube. The apparatus con-sisted of (1) unit for placing the glass tube containing a foam film which was moved, (2) a gas flow controlling unit made of linear-head and syringe, (3) a pressure measuring unit consisting of a pressure sensor and amplifier, and (4) a data processing unit for calculating shear stress when the wetting glass tube by the foam film. The rate of film movement was controlled at 0.1 mm/s to 6.0 mm/s. A 0.5% SDS solution was used as the bulk liquid.
Film movement was a function of the gas flow, confirmed by the finding that the inside diameter of the glass tube (48 mm) was independent from shear stress with film movement. The relation between shear stress and rate of film movement was determined from the equation,
F=3.58 logR+8.35,
where F is the shear stress with movement of the foam film (mN/m) and R, the rate of film movement (mm/s).